merge trunk

24 files changed, 1260 insertions, 707 deletions

diff --git a/unix/Makefile.in b/unix/Makefile.in
index 6c09473..cf28c6c 100644
--- a/unix/Makefile.in
+++ b/unix/Makefile.in
@@ -96,7 +96,7 @@ CFLAGS_WARNING		= @CFLAGS_WARNING@
 
 # The default switches for optimization or debugging
 CFLAGS_DEBUG		= @CFLAGS_DEBUG@
-CFLAGS_OPTIMIZE		= -DNDEBUG @CFLAGS_OPTIMIZE@
+CFLAGS_OPTIMIZE		= @CFLAGS_OPTIMIZE@
 
 # To change the compiler switches, for example to change from optimization to
 # debugging symbols, change the following line:
@@ -294,7 +294,7 @@ GENERIC_OBJS = regcomp.o regexec.o regfree.o regerror.o tclAlloc.o \
 	tclAssembly.o tclAsync.o tclBasic.o tclBinary.o tclCkalloc.o \
 	tclClock.o tclCmdAH.o tclCmdIL.o tclCmdMZ.o \
 	tclCompCmds.o tclCompCmdsGR.o tclCompCmdsSZ.o tclCompExpr.o \
-	tclCompile.o tclConfig.o tclDate.o tclDictObj.o \
+	tclCompile.o tclConfig.o tclDate.o tclDictObj.o tclDisassemble.o \
 	tclEncoding.o tclEnsemble.o \
 	tclEnv.o tclEvent.o tclExecute.o tclFCmd.o tclFileName.o tclGet.o \
 	tclHash.o tclHistory.o tclIndexObj.o tclInterp.o tclIO.o tclIOCmd.o \
@@ -407,6 +407,7 @@ GENERIC_SRCS = \
 	$(GENERIC_DIR)/tclConfig.c \
 	$(GENERIC_DIR)/tclDate.c \
 	$(GENERIC_DIR)/tclDictObj.c \
+	$(GENERIC_DIR)/tclDisassemble.c \
 	$(GENERIC_DIR)/tclEncoding.c \
 	$(GENERIC_DIR)/tclEnsemble.c \
 	$(GENERIC_DIR)/tclEnv.c \
@@ -613,7 +614,7 @@ SRCS = $(GENERIC_SRCS) $(TOMMATH_SRCS) $(UNIX_SRCS) $(NOTIFY_SRCS) \
 
 all: binaries libraries doc packages
 
-binaries: ${LIB_FILE} $(STUB_LIB_FILE) ${TCL_EXE}
+binaries: ${LIB_FILE} ${TCL_EXE}
 
 libraries:
 
@@ -621,11 +622,14 @@ doc:
 
 # The following target is configured by autoconf to generate either a shared
 # library or non-shared library for Tcl.
-${LIB_FILE}: ${OBJS} ${STUB_LIB_FILE}
+${LIB_FILE}: ${STUB_LIB_FILE} ${OBJS}
 	rm -f $@
 	@MAKE_LIB@
 
 ${STUB_LIB_FILE}: ${STUB_LIB_OBJS}
+	@if test "x${LIB_FILE}" = "xlibtcl${MAJOR_VERSION}.${MINOR_VERSION}.dll"; then \
+	    (cd ${TOP_DIR}/win; ${MAKE} tcldde14.dll tclreg13.dll); \
+	fi
 	rm -f $@
 	@MAKE_STUB_LIB@
 
@@ -779,10 +783,6 @@ install-strip:
 		INSTALL_PROGRAM="$(INSTALL_PROGRAM) ${INSTALL_STRIP_PROGRAM}" \
 		INSTALL_LIBRARY="$(INSTALL_LIBRARY) ${INSTALL_STRIP_LIBRARY}"
 
-# Note: before running ranlib below, must cd to target directory because some
-# ranlibs write to current directory, and this might not always be possible
-# (e.g. if installing as root).
-
 install-binaries: binaries
 	@for i in "$(LIB_INSTALL_DIR)" "$(BIN_INSTALL_DIR)" \
 		"$(CONFIG_INSTALL_DIR)"; \
@@ -840,20 +840,20 @@ install-libraries: libraries
 	    do \
 	    $(INSTALL_DATA) $$i "$(SCRIPT_INSTALL_DIR)"/http1.0; \
 	    done;
-	@echo "Installing package http 2.8.8 as a Tcl Module";
-	@$(INSTALL_DATA) $(TOP_DIR)/library/http/http.tcl "$(SCRIPT_INSTALL_DIR)"/../tcl8/8.6/http-2.8.8.tm;
+	@echo "Installing package http 2.8.9 as a Tcl Module";
+	@$(INSTALL_DATA) $(TOP_DIR)/library/http/http.tcl "$(SCRIPT_INSTALL_DIR)"/../tcl8/8.6/http-2.8.9.tm;
 	@echo "Installing package opt0.4 files to $(SCRIPT_INSTALL_DIR)/opt0.4/";
 	@for i in $(TOP_DIR)/library/opt/*.tcl ; \
 	    do \
 	    $(INSTALL_DATA) $$i "$(SCRIPT_INSTALL_DIR)"/opt0.4; \
 	    done;
-	@echo "Installing package msgcat 1.5.2 as a Tcl Module";
-	@$(INSTALL_DATA) $(TOP_DIR)/library/msgcat/msgcat.tcl "$(SCRIPT_INSTALL_DIR)"/../tcl8/8.5/msgcat-1.5.2.tm;
-	@echo "Installing package tcltest 2.3.6 as a Tcl Module";
-	@$(INSTALL_DATA) $(TOP_DIR)/library/tcltest/tcltest.tcl "$(SCRIPT_INSTALL_DIR)"/../tcl8/8.5/tcltest-2.3.6.tm;
+	@echo "Installing package msgcat 1.6.0 as a Tcl Module";
+	@$(INSTALL_DATA) $(TOP_DIR)/library/msgcat/msgcat.tcl "$(SCRIPT_INSTALL_DIR)"/../tcl8/8.5/msgcat-1.6.0.tm;
+	@echo "Installing package tcltest 2.3.8 as a Tcl Module";
+	@$(INSTALL_DATA) $(TOP_DIR)/library/tcltest/tcltest.tcl "$(SCRIPT_INSTALL_DIR)"/../tcl8/8.5/tcltest-2.3.8.tm;
 
-	@echo "Installing package platform 1.0.12 as a Tcl Module";
-	@$(INSTALL_DATA) $(TOP_DIR)/library/platform/platform.tcl "$(SCRIPT_INSTALL_DIR)"/../tcl8/8.4/platform-1.0.12.tm;
+	@echo "Installing package platform 1.0.13 as a Tcl Module";
+	@$(INSTALL_DATA) $(TOP_DIR)/library/platform/platform.tcl "$(SCRIPT_INSTALL_DIR)"/../tcl8/8.4/platform-1.0.13.tm;
 	@echo "Installing package platform::shell 1.1.4 as a Tcl Module";
 	@$(INSTALL_DATA) $(TOP_DIR)/library/platform/shell.tcl "$(SCRIPT_INSTALL_DIR)"/../tcl8/8.4/platform/shell-1.1.4.tm;
 
@@ -1032,6 +1032,7 @@ IOHDR=$(GENERIC_DIR)/tclIO.h
 MATHHDRS=$(GENERIC_DIR)/tommath.h $(GENERIC_DIR)/tclTomMath.h
 PARSEHDR=$(GENERIC_DIR)/tclParse.h
 NREHDR=$(GENERIC_DIR)/tclInt.h
+TRIMHDR=$(GENERIC_DIR)/tclStringTrim.h
 
 regcomp.o: $(REGHDRS) $(GENERIC_DIR)/regcomp.c $(GENERIC_DIR)/regc_lex.c \
 		$(GENERIC_DIR)/regc_color.c $(GENERIC_DIR)/regc_locale.c \
@@ -1077,7 +1078,7 @@ tclCmdAH.o: $(GENERIC_DIR)/tclCmdAH.c
 tclCmdIL.o: $(GENERIC_DIR)/tclCmdIL.c $(TCLREHDRS)
 	$(CC) -c $(CC_SWITCHES) $(GENERIC_DIR)/tclCmdIL.c
 
-tclCmdMZ.o: $(GENERIC_DIR)/tclCmdMZ.c $(TCLREHDRS)
+tclCmdMZ.o: $(GENERIC_DIR)/tclCmdMZ.c $(TCLREHDRS) $(TRIMHDR)
 	$(CC) -c $(CC_SWITCHES) $(GENERIC_DIR)/tclCmdMZ.c
 
 tclDate.o: $(GENERIC_DIR)/tclDate.c
@@ -1089,7 +1090,7 @@ tclCompCmds.o: $(GENERIC_DIR)/tclCompCmds.c $(COMPILEHDR)
 tclCompCmdsGR.o: $(GENERIC_DIR)/tclCompCmdsGR.c $(COMPILEHDR)
 	$(CC) -c $(CC_SWITCHES) $(GENERIC_DIR)/tclCompCmdsGR.c
 
-tclCompCmdsSZ.o: $(GENERIC_DIR)/tclCompCmdsSZ.c $(COMPILEHDR)
+tclCompCmdsSZ.o: $(GENERIC_DIR)/tclCompCmdsSZ.c $(COMPILEHDR) $(TRIMHDR)
 	$(CC) -c $(CC_SWITCHES) $(GENERIC_DIR)/tclCompCmdsSZ.c
 
 tclCompExpr.o: $(GENERIC_DIR)/tclCompExpr.c $(COMPILEHDR)
@@ -1104,6 +1105,9 @@ tclConfig.o: $(GENERIC_DIR)/tclConfig.c
 tclDictObj.o: $(GENERIC_DIR)/tclDictObj.c $(MATHHDRS)
 	$(CC) -c $(CC_SWITCHES) $(GENERIC_DIR)/tclDictObj.c
 
+tclDisassemble.o: $(GENERIC_DIR)/tclDisassemble.c $(COMPILEHDR)
+	$(CC) -c $(CC_SWITCHES) $(GENERIC_DIR)/tclDisassemble.c
+
 tclEncoding.o: $(GENERIC_DIR)/tclEncoding.c
 	$(CC) -c $(CC_SWITCHES) $(GENERIC_DIR)/tclEncoding.c
 
@@ -1305,7 +1309,7 @@ tclStubInit.o: $(GENERIC_DIR)/tclStubInit.c
 tclTrace.o: $(GENERIC_DIR)/tclTrace.c
 	$(CC) -c $(CC_SWITCHES) $(GENERIC_DIR)/tclTrace.c
 
-tclUtil.o: $(GENERIC_DIR)/tclUtil.c $(PARSEHDR)
+tclUtil.o: $(GENERIC_DIR)/tclUtil.c $(PARSEHDR) $(TRIMHDR)
 	$(CC) -c $(CC_SWITCHES) $(GENERIC_DIR)/tclUtil.c
 
 tclUtf.o: $(GENERIC_DIR)/tclUtf.c $(GENERIC_DIR)/tclUniData.c
@@ -1569,10 +1573,9 @@ tclUnixThrd.o: $(UNIX_DIR)/tclUnixThrd.c
 tclUnixTime.o: $(UNIX_DIR)/tclUnixTime.c
 	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclUnixTime.c
 
+TCL_LOCATIONS=-DTCL_LIBRARY="\"${TCL_LIBRARY}\"" -DTCL_PACKAGE_PATH="\"${TCL_PACKAGE_PATH}\""
 tclUnixInit.o: $(UNIX_DIR)/tclUnixInit.c tclConfig.sh
-	$(CC) -c $(CC_SWITCHES) -DTCL_LIBRARY=\"${TCL_LIBRARY}\" \
-		-DTCL_PACKAGE_PATH="\"${TCL_PACKAGE_PATH}\"" \
-		$(UNIX_DIR)/tclUnixInit.c
+	$(CC) -c $(CC_SWITCHES) $(TCL_LOCATIONS) $(UNIX_DIR)/tclUnixInit.c
 
 tclUnixCompat.o: $(UNIX_DIR)/tclUnixCompat.c
 	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclUnixCompat.c
@@ -1949,7 +1952,6 @@ $(MAC_OSX_DIR)/configure: $(MAC_OSX_DIR)/configure.ac $(UNIX_DIR)/configure
 $(UNIX_DIR)/tclConfig.h.in: $(MAC_OSX_DIR)/configure
 	cd $(MAC_OSX_DIR); autoheader; touch $@
 
-EOLFIX=$(NATIVE_TCLSH) $(TOOL_DIR)/eolFix.tcl
 dist: $(UNIX_DIR)/configure $(UNIX_DIR)/tclConfig.h.in $(UNIX_DIR)/tcl.pc.in $(MAC_OSX_DIR)/configure genstubs dist-packages ${NATIVE_TCLSH}
 	rm -rf $(DISTDIR)
 	mkdir -p $(DISTDIR)/unix
@@ -1970,7 +1972,7 @@ dist: $(UNIX_DIR)/configure $(UNIX_DIR)/tclConfig.h.in $(UNIX_DIR)/tcl.pc.in $(M
 	cp -p $(GENERIC_DIR)/*.decls $(DISTDIR)/generic
 	cp -p $(GENERIC_DIR)/README $(DISTDIR)/generic
 	cp -p $(GENERIC_DIR)/tclGetDate.y $(DISTDIR)/generic
-	cp -p $(TOP_DIR)/changes $(TOP_DIR)/ChangeLog $(TOP_DIR)/README* \
+	cp -p $(TOP_DIR)/changes $(TOP_DIR)/ChangeLog $(TOP_DIR)/README \
 		$(TOP_DIR)/ChangeLog.[12]??? $(TOP_DIR)/license.terms \
 		$(DISTDIR)
 	@mkdir $(DISTDIR)/library
@@ -2011,21 +2013,16 @@ dist: $(UNIX_DIR)/configure $(UNIX_DIR)/tclConfig.h.in $(UNIX_DIR)/tcl.pc.in $(M
 	cp $(TOP_DIR)/win/configure.in $(TOP_DIR)/win/configure \
 		$(TOP_DIR)/win/tclConfig.sh.in $(TOP_DIR)/win/tclooConfig.sh \
 		$(TOP_DIR)/win/tcl.m4 $(TOP_DIR)/win/aclocal.m4 \
+		$(TOP_DIR)/win/tclsh.exe.manifest.in \
 		$(DISTDIR)/win
 	cp -p $(TOP_DIR)/win/*.[ch] $(TOP_DIR)/win/*.ico $(TOP_DIR)/win/*.rc \
 		$(DISTDIR)/win
 	cp -p $(TOP_DIR)/win/*.bat $(DISTDIR)/win
-	@$(EOLFIX) -crlf $(DISTDIR)/win/*.bat
 	cp -p $(TOP_DIR)/win/makefile.* $(DISTDIR)/win
-	@$(EOLFIX) -crlf $(DISTDIR)/win/makefile.bc $(DISTDIR)/win/makefile.vc
 	cp -p $(TOP_DIR)/win/rules.vc $(DISTDIR)/win
-	@$(EOLFIX) -crlf $(DISTDIR)/win/rules.vc
 	cp -p $(TOP_DIR)/win/coffbase.txt $(DISTDIR)/win
-	@$(EOLFIX) -crlf $(DISTDIR)/win/coffbase.txt
 	cp -p $(TOP_DIR)/win/tcl.hpj.in $(DISTDIR)/win
-	@$(EOLFIX) -crlf $(DISTDIR)/win/tcl.hpj.in
 	cp -p $(TOP_DIR)/win/tcl.ds* $(DISTDIR)/win
-	@$(EOLFIX) -crlf $(DISTDIR)/win/tcl.ds*
 	cp -p $(TOP_DIR)/win/README $(DISTDIR)/win
 	cp -p $(TOP_DIR)/license.terms $(DISTDIR)/win
 	@mkdir $(DISTDIR)/macosx
@@ -2051,7 +2048,6 @@ dist: $(UNIX_DIR)/configure $(UNIX_DIR)/tclConfig.h.in $(UNIX_DIR)/tcl.pc.in $(M
 		$(TOOL_DIR)/*.tcl $(TOOL_DIR)/man2tcl.c \
 		$(TOOL_DIR)/*.bmp $(TOOL_DIR)/tcl.hpj.in \
 		$(DISTDIR)/tools
-	@$(EOLFIX) -crlf $(DISTDIR)/tools/tcl.hpj.in
 	@mkdir $(DISTDIR)/libtommath
 	cp -p $(TOMMATH_SRCS) $(TOMMATH_DIR)/*.h $(DISTDIR)/libtommath
 	@mkdir $(DISTDIR)/pkgs
@@ -2084,9 +2080,11 @@ alldist: dist
 html: ${NATIVE_TCLSH}
 	$(BUILD_HTML)
 	@EXTRA_BUILD_HTML@
+
 html-tcl: ${NATIVE_TCLSH}
 	$(BUILD_HTML) --tcl
 	@EXTRA_BUILD_HTML@
+
 html-tk: ${NATIVE_TCLSH}
 	$(BUILD_HTML) --tk
 	@EXTRA_BUILD_HTML@
diff --git a/unix/configure b/unix/configure
index 06ff7a4..31758c3 100755
--- a/unix/configure
+++ b/unix/configure
@@ -857,6 +857,8 @@ Optional Features:
   --enable-load           allow dynamic loading and "load" command (default:
                           on)
   --enable-symbols        build with debugging symbols (default: off)
+  --enable-usleep         use usleep if possible to sleep, otherwise use
+                          Tcl_Sleep (default: on)
   --enable-langinfo       use nl_langinfo if possible to determine encoding at
                           startup, otherwise use old heuristic (default: on)
   --enable-dll-unloading  enable the 'unload' command (default: on)
@@ -1335,9 +1337,12 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 TCL_VERSION=8.6
 TCL_MAJOR_VERSION=8
 TCL_MINOR_VERSION=6
-TCL_PATCH_LEVEL=".1"
+TCL_PATCH_LEVEL=".4"
 VERSION=${TCL_VERSION}
 
+EXTRA_INSTALL_BINARIES=${EXTRA_INSTALL_BINARIES:-"@:"}
+EXTRA_BUILD_HTML=${EXTRA_BUILD_HTML:-"@:"}
+
 #------------------------------------------------------------------------
 # Setup configure arguments for bundled packages
 #------------------------------------------------------------------------
@@ -3329,158 +3334,6 @@ _ACEOF
 fi
 
 
-    if test "${ac_cv_header_limits_h+set}" = set; then
-  echo "$as_me:$LINENO: checking for limits.h" >&5
-echo $ECHO_N "checking for limits.h... $ECHO_C" >&6
-if test "${ac_cv_header_limits_h+set}" = set; then
-  echo $ECHO_N "(cached) $ECHO_C" >&6
-fi
-echo "$as_me:$LINENO: result: $ac_cv_header_limits_h" >&5
-echo "${ECHO_T}$ac_cv_header_limits_h" >&6
-else
-  # Is the header compilable?
-echo "$as_me:$LINENO: checking limits.h usability" >&5
-echo $ECHO_N "checking limits.h usability... $ECHO_C" >&6
-cat >conftest.$ac_ext <<_ACEOF
-/* confdefs.h.  */
-_ACEOF
-cat confdefs.h >>conftest.$ac_ext
-cat >>conftest.$ac_ext <<_ACEOF
-/* end confdefs.h.  */
-$ac_includes_default
-#include <limits.h>
-_ACEOF
-rm -f conftest.$ac_objext
-if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
-  (eval $ac_compile) 2>conftest.er1
-  ac_status=$?
-  grep -v '^ *+' conftest.er1 >conftest.err
-  rm -f conftest.er1
-  cat conftest.err >&5
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
-  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); }; } &&
-	 { ac_try='test -s conftest.$ac_objext'
-  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); }; }; then
-  ac_header_compiler=yes
-else
-  echo "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
-
-ac_header_compiler=no
-fi
-rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
-echo "$as_me:$LINENO: result: $ac_header_compiler" >&5
-echo "${ECHO_T}$ac_header_compiler" >&6
-
-# Is the header present?
-echo "$as_me:$LINENO: checking limits.h presence" >&5
-echo $ECHO_N "checking limits.h presence... $ECHO_C" >&6
-cat >conftest.$ac_ext <<_ACEOF
-/* confdefs.h.  */
-_ACEOF
-cat confdefs.h >>conftest.$ac_ext
-cat >>conftest.$ac_ext <<_ACEOF
-/* end confdefs.h.  */
-#include <limits.h>
-_ACEOF
-if { (eval echo "$as_me:$LINENO: \"$ac_cpp conftest.$ac_ext\"") >&5
-  (eval $ac_cpp conftest.$ac_ext) 2>conftest.er1
-  ac_status=$?
-  grep -v '^ *+' conftest.er1 >conftest.err
-  rm -f conftest.er1
-  cat conftest.err >&5
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); } >/dev/null; then
-  if test -s conftest.err; then
-    ac_cpp_err=$ac_c_preproc_warn_flag
-    ac_cpp_err=$ac_cpp_err$ac_c_werror_flag
-  else
-    ac_cpp_err=
-  fi
-else
-  ac_cpp_err=yes
-fi
-if test -z "$ac_cpp_err"; then
-  ac_header_preproc=yes
-else
-  echo "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
-
-  ac_header_preproc=no
-fi
-rm -f conftest.err conftest.$ac_ext
-echo "$as_me:$LINENO: result: $ac_header_preproc" >&5
-echo "${ECHO_T}$ac_header_preproc" >&6
-
-# So?  What about this header?
-case $ac_header_compiler:$ac_header_preproc:$ac_c_preproc_warn_flag in
-  yes:no: )
-    { echo "$as_me:$LINENO: WARNING: limits.h: accepted by the compiler, rejected by the preprocessor!" >&5
-echo "$as_me: WARNING: limits.h: accepted by the compiler, rejected by the preprocessor!" >&2;}
-    { echo "$as_me:$LINENO: WARNING: limits.h: proceeding with the compiler's result" >&5
-echo "$as_me: WARNING: limits.h: proceeding with the compiler's result" >&2;}
-    ac_header_preproc=yes
-    ;;
-  no:yes:* )
-    { echo "$as_me:$LINENO: WARNING: limits.h: present but cannot be compiled" >&5
-echo "$as_me: WARNING: limits.h: present but cannot be compiled" >&2;}
-    { echo "$as_me:$LINENO: WARNING: limits.h:     check for missing prerequisite headers?" >&5
-echo "$as_me: WARNING: limits.h:     check for missing prerequisite headers?" >&2;}
-    { echo "$as_me:$LINENO: WARNING: limits.h: see the Autoconf documentation" >&5
-echo "$as_me: WARNING: limits.h: see the Autoconf documentation" >&2;}
-    { echo "$as_me:$LINENO: WARNING: limits.h:     section \"Present But Cannot Be Compiled\"" >&5
-echo "$as_me: WARNING: limits.h:     section \"Present But Cannot Be Compiled\"" >&2;}
-    { echo "$as_me:$LINENO: WARNING: limits.h: proceeding with the preprocessor's result" >&5
-echo "$as_me: WARNING: limits.h: proceeding with the preprocessor's result" >&2;}
-    { echo "$as_me:$LINENO: WARNING: limits.h: in the future, the compiler will take precedence" >&5
-echo "$as_me: WARNING: limits.h: in the future, the compiler will take precedence" >&2;}
-    (
-      cat <<\_ASBOX
-## ------------------------------ ##
-## Report this to the tcl lists.  ##
-## ------------------------------ ##
-_ASBOX
-    ) |
-      sed "s/^/$as_me: WARNING:     /" >&2
-    ;;
-esac
-echo "$as_me:$LINENO: checking for limits.h" >&5
-echo $ECHO_N "checking for limits.h... $ECHO_C" >&6
-if test "${ac_cv_header_limits_h+set}" = set; then
-  echo $ECHO_N "(cached) $ECHO_C" >&6
-else
-  ac_cv_header_limits_h=$ac_header_preproc
-fi
-echo "$as_me:$LINENO: result: $ac_cv_header_limits_h" >&5
-echo "${ECHO_T}$ac_cv_header_limits_h" >&6
-
-fi
-if test $ac_cv_header_limits_h = yes; then
-
-cat >>confdefs.h <<\_ACEOF
-#define HAVE_LIMITS_H 1
-_ACEOF
-
-else
-
-cat >>confdefs.h <<\_ACEOF
-#define NO_LIMITS_H 1
-_ACEOF
-
-fi
-
-
     if test "${ac_cv_header_stdlib_h+set}" = set; then
   echo "$as_me:$LINENO: checking for stdlib.h" >&5
 echo $ECHO_N "checking for stdlib.h... $ECHO_C" >&6
@@ -6490,80 +6343,6 @@ if test "${tcl_cv_cc_visibility_hidden+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
 else
 
-	    if test "$SHARED_BUILD" = 1; then
-
-		hold_cflags=$CFLAGS; CFLAGS="$CFLAGS -fvisibility=hidden -Werror"
-		cat >conftest.$ac_ext <<_ACEOF
-/* confdefs.h.  */
-_ACEOF
-cat confdefs.h >>conftest.$ac_ext
-cat >>conftest.$ac_ext <<_ACEOF
-/* end confdefs.h.  */
-
-int
-main ()
-{
-#if !defined(__GNUC__) || __GNUC__ < 4
-#error visibility hidden is not supported for this compiler
-#endif
-
-  ;
-  return 0;
-}
-_ACEOF
-rm -f conftest.$ac_objext
-if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
-  (eval $ac_compile) 2>conftest.er1
-  ac_status=$?
-  grep -v '^ *+' conftest.er1 >conftest.err
-  rm -f conftest.er1
-  cat conftest.err >&5
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
-  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); }; } &&
-	 { ac_try='test -s conftest.$ac_objext'
-  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); }; }; then
-  tcl_cv_cc_visibility_hidden=yes
-else
-  echo "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
-
-tcl_cv_cc_visibility_hidden=no
-fi
-rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
-		CFLAGS=$hold_cflags
-
-else
-
-		tcl_cv_cc_visibility_hidden=no
-
-fi
-
-
-fi
-echo "$as_me:$LINENO: result: $tcl_cv_cc_visibility_hidden" >&5
-echo "${ECHO_T}$tcl_cv_cc_visibility_hidden" >&6
-    if test $tcl_cv_cc_visibility_hidden = yes; then
-
-	CFLAGS="$CFLAGS -fvisibility=hidden"
-
-cat >>confdefs.h <<\_ACEOF
-#define MODULE_SCOPE extern
-_ACEOF
-
-
-else
-
 	hold_cflags=$CFLAGS; CFLAGS="$CFLAGS -Werror"
 	cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
@@ -6614,7 +6393,10 @@ fi
 rm -f conftest.err conftest.$ac_objext \
       conftest$ac_exeext conftest.$ac_ext
 	CFLAGS=$hold_cflags
-	if test $tcl_cv_cc_visibility_hidden = yes; then
+fi
+echo "$as_me:$LINENO: result: $tcl_cv_cc_visibility_hidden" >&5
+echo "${ECHO_T}$tcl_cv_cc_visibility_hidden" >&6
+    if test $tcl_cv_cc_visibility_hidden = yes; then
 
 
 cat >>confdefs.h <<\_ACEOF
@@ -6630,9 +6412,6 @@ _ACEOF
 fi
 
 
-fi
-
-
     # Step 0.d: Disable -rpath support?
 
     echo "$as_me:$LINENO: checking if rpath support is requested" >&5
@@ -7081,7 +6860,7 @@ fi
 	    LD_SEARCH_FLAGS=""
 	    TCL_NEEDS_EXP_FILE=1
 	    TCL_EXPORT_FILE_SUFFIX='${VERSION}\$\{DBGX\}.dll.a'
-	    TCL_SHLIB_LD_EXTRAS='-Wl,--out-implib,$@.a'
+	    SHLIB_LD_LIBS="${SHLIB_LD_LIBS} -Wl,--out-implib,\$@.a"
 	    echo "$as_me:$LINENO: checking for Cygwin version of gcc" >&5
 echo $ECHO_N "checking for Cygwin version of gcc... $ECHO_C" >&6
 if test "${ac_cv_cygwin+set}" = set; then
@@ -7150,10 +6929,15 @@ echo "$as_me: error: ${CC} is not a cygwin compiler." >&2;}
 echo "$as_me: error: CYGWIN compile is only supported with --enable-threads" >&2;}
    { (exit 1); exit 1; }; }
 	    fi
-	    if test "x${SHARED_BUILD}" = "x1" -a ! -f "../win/tcldde14.dll" -a ! -f "../win/tk86.dll"; then
-		{ { echo "$as_me:$LINENO: error: Please configure and make the ../win directory first." >&5
-echo "$as_me: error: Please configure and make the ../win directory first." >&2;}
-   { (exit 1); exit 1; }; }
+	    do64bit_ok=yes
+	    if test "x${SHARED_BUILD}" = "x1"; then
+		echo "running cd ${TCL_SRC_DIR}/win; ${CONFIG_SHELL-/bin/sh} ./configure $ac_configure_args"
+		# The eval makes quoting arguments work.
+		if cd ${TCL_SRC_DIR}/win; eval ${CONFIG_SHELL-/bin/sh} ./configure $ac_configure_args; cd ../unix
+		then :
+		else
+		    { echo "configure: error: configure failed for ../win" 1>&2; exit 1; }
+		fi
 	    fi
 	    ;;
 	dgux*)
@@ -7742,7 +7526,14 @@ fi
 		LDFLAGS=""
 		;;
 	    *)
-		SHLIB_CFLAGS="-fPIC"
+		case "$arch" in
+		alpha|sparc64)
+		    SHLIB_CFLAGS="-fPIC"
+		    ;;
+		*)
+		    SHLIB_CFLAGS="-fpic"
+		    ;;
+		esac
 		SHLIB_LD='${CC} -shared ${SHLIB_CFLAGS}'
 		SHLIB_SUFFIX=".so"
 		DL_OBJS="tclLoadDl.o"
@@ -7809,7 +7600,7 @@ fi
 	    # This configuration from FreeBSD Ports.
 	    SHLIB_CFLAGS="-fPIC"
 	    SHLIB_LD="${CC} -shared"
-	    TCL_SHLIB_LD_EXTRAS="-Wl,-soname=\$@"
+	    SHLIB_LD_LIBS="${SHLIB_LD_LIBS} -Wl,-soname,\$@"
 	    SHLIB_SUFFIX=".so"
 	    DL_OBJS="tclLoadDl.o"
 	    DL_LIBS=""
@@ -7828,11 +7619,15 @@ fi
 		LDFLAGS="$LDFLAGS $PTHREAD_LIBS"
 fi
 
-	    # Version numbers are dot-stripped by system policy.
-	    TCL_TRIM_DOTS=`echo ${VERSION} | tr -d .`
-	    UNSHARED_LIB_SUFFIX='${TCL_TRIM_DOTS}.a'
-	    SHARED_LIB_SUFFIX='${TCL_TRIM_DOTS}\$\{DBGX\}.so.1'
-	    TCL_LIB_VERSIONS_OK=nodots
+	    case $system in
+	    FreeBSD-3.*)
+		# Version numbers are dot-stripped by system policy.
+		TCL_TRIM_DOTS=`echo ${VERSION} | tr -d .`
+		UNSHARED_LIB_SUFFIX='${TCL_TRIM_DOTS}.a'
+		SHARED_LIB_SUFFIX='${TCL_TRIM_DOTS}.so'
+		TCL_LIB_VERSIONS_OK=nodots
+		;;
+	    esac
 	    ;;
 	Darwin-*)
 	    CFLAGS_OPTIMIZE="-Os"
@@ -8145,7 +7940,6 @@ cat >>confdefs.h <<\_ACEOF
 #define MODULE_SCOPE __private_extern__
 _ACEOF
 
-		tcl_cv_cc_visibility_hidden=yes
 
 fi
 
@@ -9044,7 +8838,7 @@ fi
     if test "${SHARED_BUILD}" = 1 -a "${SHLIB_SUFFIX}" != ""; then
 
         LIB_SUFFIX=${SHARED_LIB_SUFFIX}
-        MAKE_LIB='${SHLIB_LD} -o $@ ${OBJS} ${TCL_SHLIB_LD_EXTRAS} ${SHLIB_LD_LIBS} ${TK_SHLIB_LD_EXTRAS} ${LD_SEARCH_FLAGS}'
+        MAKE_LIB='${SHLIB_LD} -o $@ ${OBJS} ${SHLIB_LD_LIBS} ${TCL_SHLIB_LD_EXTRAS} ${TK_SHLIB_LD_EXTRAS} ${LD_SEARCH_FLAGS}'
         if test "${SHLIB_SUFFIX}" = ".dll"; then
 
             INSTALL_LIB='$(INSTALL_LIBRARY) $(LIB_FILE) "$(BIN_INSTALL_DIR)/$(LIB_FILE)"'
@@ -9064,15 +8858,14 @@ else
         if test "$RANLIB" = ""; then
 
             MAKE_LIB='$(STLIB_LD) $@ ${OBJS}'
-            INSTALL_LIB='$(INSTALL_LIBRARY) $(LIB_FILE) "$(LIB_INSTALL_DIR)/$(LIB_FILE)"'
 
 else
 
             MAKE_LIB='${STLIB_LD} $@ ${OBJS} ; ${RANLIB} $@'
-            INSTALL_LIB='$(INSTALL_LIBRARY) $(LIB_FILE) "$(LIB_INSTALL_DIR)/$(LIB_FILE)" ; (cd "$(LIB_INSTALL_DIR)" ; $(RANLIB) $(LIB_FILE))'
 
 fi
 
+        INSTALL_LIB='$(INSTALL_LIBRARY) $(LIB_FILE) "$(LIB_INSTALL_DIR)/$(LIB_FILE)"'
 
 fi
 
@@ -9081,15 +8874,14 @@ fi
     if test "$RANLIB" = ""; then
 
         MAKE_STUB_LIB='${STLIB_LD} $@ ${STUB_LIB_OBJS}'
-        INSTALL_STUB_LIB='$(INSTALL_LIBRARY) $(STUB_LIB_FILE) "$(LIB_INSTALL_DIR)/$(STUB_LIB_FILE)"'
 
 else
 
         MAKE_STUB_LIB='${STLIB_LD} $@ ${STUB_LIB_OBJS} ; ${RANLIB} $@'
-        INSTALL_STUB_LIB='$(INSTALL_LIBRARY) $(STUB_LIB_FILE) "$(LIB_INSTALL_DIR)/$(STUB_LIB_FILE)" ; (cd "$(LIB_INSTALL_DIR)" ; $(RANLIB) $(STUB_LIB_FILE))'
 
 fi
 
+    INSTALL_STUB_LIB='$(INSTALL_LIBRARY) $(STUB_LIB_FILE) "$(LIB_INSTALL_DIR)/$(STUB_LIB_FILE)"'
 
     # Define TCL_LIBS now that we know what DL_LIBS is.
     # The trick here is that we don't want to change the value of TCL_LIBS if
@@ -16938,6 +16730,235 @@ _ACEOF
 fi
 
 #--------------------------------------------------------------------
+# Check for support of usleep function
+#--------------------------------------------------------------------
+
+
+    # Check whether --enable-usleep or --disable-usleep was given.
+if test "${enable_usleep+set}" = set; then
+  enableval="$enable_usleep"
+  usleep_ok=$enableval
+else
+  usleep_ok=yes
+fi;
+
+    HAVE_USLEEP=0
+    if test "$usleep_ok" = "yes"; then
+	if test "${ac_cv_header_unistd_h+set}" = set; then
+  echo "$as_me:$LINENO: checking for unistd.h" >&5
+echo $ECHO_N "checking for unistd.h... $ECHO_C" >&6
+if test "${ac_cv_header_unistd_h+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+fi
+echo "$as_me:$LINENO: result: $ac_cv_header_unistd_h" >&5
+echo "${ECHO_T}$ac_cv_header_unistd_h" >&6
+else
+  # Is the header compilable?
+echo "$as_me:$LINENO: checking unistd.h usability" >&5
+echo $ECHO_N "checking unistd.h usability... $ECHO_C" >&6
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+$ac_includes_default
+#include <unistd.h>
+_ACEOF
+rm -f conftest.$ac_objext
+if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
+  (eval $ac_compile) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest.$ac_objext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_header_compiler=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+ac_header_compiler=no
+fi
+rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
+echo "$as_me:$LINENO: result: $ac_header_compiler" >&5
+echo "${ECHO_T}$ac_header_compiler" >&6
+
+# Is the header present?
+echo "$as_me:$LINENO: checking unistd.h presence" >&5
+echo $ECHO_N "checking unistd.h presence... $ECHO_C" >&6
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#include <unistd.h>
+_ACEOF
+if { (eval echo "$as_me:$LINENO: \"$ac_cpp conftest.$ac_ext\"") >&5
+  (eval $ac_cpp conftest.$ac_ext) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } >/dev/null; then
+  if test -s conftest.err; then
+    ac_cpp_err=$ac_c_preproc_warn_flag
+    ac_cpp_err=$ac_cpp_err$ac_c_werror_flag
+  else
+    ac_cpp_err=
+  fi
+else
+  ac_cpp_err=yes
+fi
+if test -z "$ac_cpp_err"; then
+  ac_header_preproc=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+  ac_header_preproc=no
+fi
+rm -f conftest.err conftest.$ac_ext
+echo "$as_me:$LINENO: result: $ac_header_preproc" >&5
+echo "${ECHO_T}$ac_header_preproc" >&6
+
+# So?  What about this header?
+case $ac_header_compiler:$ac_header_preproc:$ac_c_preproc_warn_flag in
+  yes:no: )
+    { echo "$as_me:$LINENO: WARNING: unistd.h: accepted by the compiler, rejected by the preprocessor!" >&5
+echo "$as_me: WARNING: unistd.h: accepted by the compiler, rejected by the preprocessor!" >&2;}
+    { echo "$as_me:$LINENO: WARNING: unistd.h: proceeding with the compiler's result" >&5
+echo "$as_me: WARNING: unistd.h: proceeding with the compiler's result" >&2;}
+    ac_header_preproc=yes
+    ;;
+  no:yes:* )
+    { echo "$as_me:$LINENO: WARNING: unistd.h: present but cannot be compiled" >&5
+echo "$as_me: WARNING: unistd.h: present but cannot be compiled" >&2;}
+    { echo "$as_me:$LINENO: WARNING: unistd.h:     check for missing prerequisite headers?" >&5
+echo "$as_me: WARNING: unistd.h:     check for missing prerequisite headers?" >&2;}
+    { echo "$as_me:$LINENO: WARNING: unistd.h: see the Autoconf documentation" >&5
+echo "$as_me: WARNING: unistd.h: see the Autoconf documentation" >&2;}
+    { echo "$as_me:$LINENO: WARNING: unistd.h:     section \"Present But Cannot Be Compiled\"" >&5
+echo "$as_me: WARNING: unistd.h:     section \"Present But Cannot Be Compiled\"" >&2;}
+    { echo "$as_me:$LINENO: WARNING: unistd.h: proceeding with the preprocessor's result" >&5
+echo "$as_me: WARNING: unistd.h: proceeding with the preprocessor's result" >&2;}
+    { echo "$as_me:$LINENO: WARNING: unistd.h: in the future, the compiler will take precedence" >&5
+echo "$as_me: WARNING: unistd.h: in the future, the compiler will take precedence" >&2;}
+    (
+      cat <<\_ASBOX
+## ------------------------------ ##
+## Report this to the tcl lists.  ##
+## ------------------------------ ##
+_ASBOX
+    ) |
+      sed "s/^/$as_me: WARNING:     /" >&2
+    ;;
+esac
+echo "$as_me:$LINENO: checking for unistd.h" >&5
+echo $ECHO_N "checking for unistd.h... $ECHO_C" >&6
+if test "${ac_cv_header_unistd_h+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  ac_cv_header_unistd_h=$ac_header_preproc
+fi
+echo "$as_me:$LINENO: result: $ac_cv_header_unistd_h" >&5
+echo "${ECHO_T}$ac_cv_header_unistd_h" >&6
+
+fi
+if test $ac_cv_header_unistd_h = yes; then
+  usleep_ok=yes
+else
+  usleep_ok=no
+fi
+
+
+    fi
+    echo "$as_me:$LINENO: checking whether to use usleep" >&5
+echo $ECHO_N "checking whether to use usleep... $ECHO_C" >&6
+    if test "$usleep_ok" = "yes"; then
+	if test "${tcl_cv_usleep_h+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+
+	    cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#include <unistd.h>
+int
+main ()
+{
+usleep(0);
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext
+if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
+  (eval $ac_compile) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest.$ac_objext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  tcl_cv_usleep_h=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+tcl_cv_usleep_h=no
+fi
+rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+
+	echo "$as_me:$LINENO: result: $tcl_cv_usleep_h" >&5
+echo "${ECHO_T}$tcl_cv_usleep_h" >&6
+	if test $tcl_cv_usleep_h = yes; then
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_USLEEP 1
+_ACEOF
+
+	fi
+    else
+	echo "$as_me:$LINENO: result: $usleep_ok" >&5
+echo "${ECHO_T}$usleep_ok" >&6
+    fi
+
+
+#--------------------------------------------------------------------
 # Check for support of nl_langinfo function
 #--------------------------------------------------------------------
 
diff --git a/unix/configure.in b/unix/configure.in
index 61ad30f..ce68391 100644
--- a/unix/configure.in
+++ b/unix/configure.in
@@ -25,9 +25,12 @@ m4_ifdef([SC_USE_CONFIG_HEADERS], [
 TCL_VERSION=8.6
 TCL_MAJOR_VERSION=8
 TCL_MINOR_VERSION=6
-TCL_PATCH_LEVEL=".1"
+TCL_PATCH_LEVEL=".4"
 VERSION=${TCL_VERSION}
 
+EXTRA_INSTALL_BINARIES=${EXTRA_INSTALL_BINARIES:-"@:"}
+EXTRA_BUILD_HTML=${EXTRA_BUILD_HTML:-"@:"}
+
 #------------------------------------------------------------------------
 # Setup configure arguments for bundled packages
 #------------------------------------------------------------------------
@@ -542,6 +545,12 @@ if test $tcl_cv_putenv_copy = yes; then
 fi
 
 #--------------------------------------------------------------------
+# Check for support of usleep function
+#--------------------------------------------------------------------
+
+SC_ENABLE_USLEEP
+
+#--------------------------------------------------------------------
 # Check for support of nl_langinfo function
 #--------------------------------------------------------------------
 
diff --git a/unix/ldAix b/unix/ldAix
index 51b2995..f115ea8 100755
--- a/unix/ldAix
+++ b/unix/ldAix
@@ -1,5 +1,5 @@
 #!/bin/sh
-# 
+#
 # ldAix ldCmd ldArg ldArg ...
 #
 # This shell script provides a wrapper for ld under AIX in order to
@@ -40,8 +40,8 @@ rm -f lib.exp
 echo "#! $outputFile" >lib.exp
 /usr/ccs/bin/nm $nmopts $ofiles | sed -e '/:$/d' -e '/ U /d' -e 's/^\.//' -e 's/[ 	|].*//' | sort | uniq >>lib.exp
 
-# If we're linking a .a file, then link all the objects together into a 
-# single file "shr.o" and then put that into the archive.  Otherwise link 
+# If we're linking a .a file, then link all the objects together into a
+# single file "shr.o" and then put that into the archive.  Otherwise link
 # the object files directly into the .a file.
 
 noDotA=`echo $outputFile | sed -e '/\.a$/d'`
diff --git a/unix/tcl.m4 b/unix/tcl.m4
index 194cf90..d896d05 100644
--- a/unix/tcl.m4
+++ b/unix/tcl.m4
@@ -111,9 +111,9 @@ AC_DEFUN([SC_PATH_TCLCONFIG], [
 			`ls -dr ${srcdir}/../tcl[[8-9]].[[0-9]] 2>/dev/null` \
 			`ls -dr ${srcdir}/../tcl[[8-9]].[[0-9]]* 2>/dev/null` ; do
 		    if test -f "$i/unix/tclConfig.sh" ; then
-		    ac_cv_c_tclconfig="`(cd $i/unix; pwd)`"
-		    break
-		fi
+			ac_cv_c_tclconfig="`(cd $i/unix; pwd)`"
+			break
+		    fi
 		done
 	    fi
 	])
@@ -271,11 +271,10 @@ AC_DEFUN([SC_PATH_TKCONFIG], [
 #
 # Results:
 #
-#	Subst the following vars:
+#	Substitutes the following vars:
 #		TCL_BIN_DIR
 #		TCL_SRC_DIR
 #		TCL_LIB_FILE
-#
 #------------------------------------------------------------------------
 
 AC_DEFUN([SC_LOAD_TCLCONFIG], [
@@ -439,11 +438,11 @@ AC_DEFUN([SC_LOAD_TKCONFIG], [
 #	extension can't assume that an executable Tcl shell exists at
 #	build time.
 #
-# Arguments
+# Arguments:
 #	none
 #
-# Results
-#	Subst's the following values:
+# Results:
+#	Substitutes the following vars:
 #		TCLSH_PROG
 #------------------------------------------------------------------------
 
@@ -484,11 +483,11 @@ AC_DEFUN([SC_PROG_TCLSH], [
 #	when running tests from an extension build directory. It is not
 #	correct to use the TCLSH_PROG in cases like this.
 #
-# Arguments
+# Arguments:
 #	none
 #
-# Results
-#	Subst's the following values:
+# Results:
+#	Substitutes the following values:
 #		BUILD_TCLSH
 #------------------------------------------------------------------------
 
@@ -775,6 +774,48 @@ AC_DEFUN([SC_ENABLE_SYMBOLS], [
 ])
 
 #------------------------------------------------------------------------
+# SC_ENABLE_USLEEP --
+#
+#	Allows use of usleep function.
+#	This is only relevant for Unix.
+#
+# Arguments:
+#	none
+#
+# Results:
+#
+#	Adds the following arguments to configure:
+#		--enable-usleep=yes|no (default is yes)
+#
+#	Defines the following vars:
+#		HAVE_USLEEP	Triggers use of usleep if defined.
+#------------------------------------------------------------------------
+
+AC_DEFUN([SC_ENABLE_USLEEP], [
+    AC_ARG_ENABLE(usleep,
+	AC_HELP_STRING([--enable-usleep],
+	    [use usleep if possible to sleep, otherwise use Tcl_Sleep (default: on)]),
+	[usleep_ok=$enableval], [usleep_ok=yes])
+
+    HAVE_USLEEP=0
+    if test "$usleep_ok" = "yes"; then
+	AC_CHECK_HEADER(unistd.h,[usleep_ok=yes],[usleep_ok=no])
+    fi
+    AC_MSG_CHECKING([whether to use usleep])
+    if test "$usleep_ok" = "yes"; then
+	AC_CACHE_VAL(tcl_cv_usleep_h, [
+	    AC_TRY_COMPILE([#include <unistd.h>], [usleep(0);],
+		    [tcl_cv_usleep_h=yes],[tcl_cv_usleep_h=no])])
+	AC_MSG_RESULT([$tcl_cv_usleep_h])
+	if test $tcl_cv_usleep_h = yes; then
+	    AC_DEFINE(HAVE_USLEEP, 1, [Do we have usleep()?])
+	fi
+    else
+	AC_MSG_RESULT([$usleep_ok])
+    fi
+])
+
+#------------------------------------------------------------------------
 # SC_ENABLE_LANGINFO --
 #
 #	Allows use of modern nl_langinfo check for better l10n.
@@ -790,7 +831,6 @@ AC_DEFUN([SC_ENABLE_SYMBOLS], [
 #
 #	Defines the following vars:
 #		HAVE_LANGINFO	Triggers use of nl_langinfo if defined.
-#
 #------------------------------------------------------------------------
 
 AC_DEFUN([SC_ENABLE_LANGINFO], [
@@ -1045,34 +1085,17 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
 
     AC_CACHE_CHECK([if compiler supports visibility "hidden"],
 	tcl_cv_cc_visibility_hidden, [
-	    AS_IF([test "$SHARED_BUILD" = 1], [
-		hold_cflags=$CFLAGS; CFLAGS="$CFLAGS -fvisibility=hidden -Werror"
-		AC_TRY_COMPILE(,[#if !defined(__GNUC__) || __GNUC__ < 4
-#error visibility hidden is not supported for this compiler
-#endif
-		], tcl_cv_cc_visibility_hidden=yes,
-		    tcl_cv_cc_visibility_hidden=no)
-		CFLAGS=$hold_cflags
-	    ], [
-		tcl_cv_cc_visibility_hidden=no
-	    ])
-    ])
-    AS_IF([test $tcl_cv_cc_visibility_hidden = yes], [
-	CFLAGS="$CFLAGS -fvisibility=hidden"
-	AC_DEFINE(MODULE_SCOPE, [extern], [No need to mark inidividual symbols as hidden])
-    ], [
 	hold_cflags=$CFLAGS; CFLAGS="$CFLAGS -Werror"
 	AC_TRY_LINK([
 	    extern __attribute__((__visibility__("hidden"))) void f(void);
 	    void f(void) {}], [f();], tcl_cv_cc_visibility_hidden=yes,
 	    tcl_cv_cc_visibility_hidden=no)
-	CFLAGS=$hold_cflags
-	AS_IF([test $tcl_cv_cc_visibility_hidden = yes], [
-	    AC_DEFINE(MODULE_SCOPE,
-		[extern __attribute__((__visibility__("hidden")))],
-		[Compiler support for module scope symbols])
-	    AC_DEFINE(HAVE_HIDDEN, [1], [Compiler support for module scope symbols])
-	])
+	CFLAGS=$hold_cflags])
+    AS_IF([test $tcl_cv_cc_visibility_hidden = yes], [
+	AC_DEFINE(MODULE_SCOPE,
+	    [extern __attribute__((__visibility__("hidden")))],
+	    [Compiler support for module scope symbols])
+	AC_DEFINE(HAVE_HIDDEN, [1], [Compiler support for module scope symbols])
     ])
 
     # Step 0.d: Disable -rpath support?
@@ -1236,7 +1259,7 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
 	    LD_SEARCH_FLAGS=""
 	    TCL_NEEDS_EXP_FILE=1
 	    TCL_EXPORT_FILE_SUFFIX='${VERSION}\$\{DBGX\}.dll.a'
-	    TCL_SHLIB_LD_EXTRAS='-Wl,--out-implib,$[@].a'
+	    SHLIB_LD_LIBS="${SHLIB_LD_LIBS} -Wl,--out-implib,\$[@].a"
 	    AC_CACHE_CHECK(for Cygwin version of gcc,
 		ac_cv_cygwin,
 		AC_TRY_COMPILE([
@@ -1253,8 +1276,15 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
 	    if test "x${TCL_THREADS}" = "x0"; then
 		AC_MSG_ERROR([CYGWIN compile is only supported with --enable-threads])
 	    fi
-	    if test "x${SHARED_BUILD}" = "x1" -a ! -f "../win/tcldde14.dll" -a ! -f "../win/tk86.dll"; then
-		AC_MSG_ERROR([Please configure and make the ../win directory first.])
+	    do64bit_ok=yes
+	    if test "x${SHARED_BUILD}" = "x1"; then
+		echo "running cd ${TCL_SRC_DIR}/win; ${CONFIG_SHELL-/bin/sh} ./configure $ac_configure_args"
+		# The eval makes quoting arguments work.
+		if cd ${TCL_SRC_DIR}/win; eval ${CONFIG_SHELL-/bin/sh} ./configure $ac_configure_args; cd ../unix
+		then :
+		else
+		    { echo "configure: error: configure failed for ../win" 1>&2; exit 1; }
+		fi
 	    fi
 	    ;;
 	dgux*)
@@ -1487,7 +1517,14 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
 		LDFLAGS=""
 		;;
 	    *)
-		SHLIB_CFLAGS="-fPIC"
+		case "$arch" in
+		alpha|sparc64)
+		    SHLIB_CFLAGS="-fPIC"
+		    ;;
+		*)
+		    SHLIB_CFLAGS="-fpic"
+		    ;;
+		esac
 		SHLIB_LD='${CC} -shared ${SHLIB_CFLAGS}'
 		SHLIB_SUFFIX=".so"
 		DL_OBJS="tclLoadDl.o"
@@ -1542,7 +1579,7 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
 	    # This configuration from FreeBSD Ports.
 	    SHLIB_CFLAGS="-fPIC"
 	    SHLIB_LD="${CC} -shared"
-	    TCL_SHLIB_LD_EXTRAS="-Wl,-soname=\$[@]"
+	    SHLIB_LD_LIBS="${SHLIB_LD_LIBS} -Wl,-soname,\$[@]"
 	    SHLIB_SUFFIX=".so"
 	    DL_OBJS="tclLoadDl.o"
 	    DL_LIBS=""
@@ -1555,11 +1592,15 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
 		LIBS=`echo $LIBS | sed s/-pthread//`
 		CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
 		LDFLAGS="$LDFLAGS $PTHREAD_LIBS"])
-	    # Version numbers are dot-stripped by system policy.
-	    TCL_TRIM_DOTS=`echo ${VERSION} | tr -d .`
-	    UNSHARED_LIB_SUFFIX='${TCL_TRIM_DOTS}.a'
-	    SHARED_LIB_SUFFIX='${TCL_TRIM_DOTS}\$\{DBGX\}.so.1'
-	    TCL_LIB_VERSIONS_OK=nodots
+	    case $system in
+	    FreeBSD-3.*)
+		# Version numbers are dot-stripped by system policy.
+		TCL_TRIM_DOTS=`echo ${VERSION} | tr -d .`
+		UNSHARED_LIB_SUFFIX='${TCL_TRIM_DOTS}.a'
+		SHARED_LIB_SUFFIX='${TCL_TRIM_DOTS}.so'
+		TCL_LIB_VERSIONS_OK=nodots
+		;;
+	    esac
 	    ;;
 	Darwin-*)
 	    CFLAGS_OPTIMIZE="-Os"
@@ -1638,7 +1679,6 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
 	    AS_IF([test "$tcl_cv_cc_visibility_hidden" != yes], [
 		AC_DEFINE(MODULE_SCOPE, [__private_extern__],
 		    [Compiler support for module scope symbols])
-		tcl_cv_cc_visibility_hidden=yes
 	    ])
 	    CC_SEARCH_FLAGS=""
 	    LD_SEARCH_FLAGS=""
@@ -2050,7 +2090,7 @@ dnl # preprocessing tests use only CPPFLAGS.
 
     AS_IF([test "${SHARED_BUILD}" = 1 -a "${SHLIB_SUFFIX}" != ""], [
         LIB_SUFFIX=${SHARED_LIB_SUFFIX}
-        MAKE_LIB='${SHLIB_LD} -o [$]@ ${OBJS} ${TCL_SHLIB_LD_EXTRAS} ${SHLIB_LD_LIBS} ${TK_SHLIB_LD_EXTRAS} ${LD_SEARCH_FLAGS}'
+        MAKE_LIB='${SHLIB_LD} -o [$]@ ${OBJS} ${SHLIB_LD_LIBS} ${TCL_SHLIB_LD_EXTRAS} ${TK_SHLIB_LD_EXTRAS} ${LD_SEARCH_FLAGS}'
         AS_IF([test "${SHLIB_SUFFIX}" = ".dll"], [
             INSTALL_LIB='$(INSTALL_LIBRARY) $(LIB_FILE) "$(BIN_INSTALL_DIR)/$(LIB_FILE)"'
             DLL_INSTALL_DIR="\$(BIN_INSTALL_DIR)"
@@ -2062,21 +2102,19 @@ dnl # preprocessing tests use only CPPFLAGS.
 
         AS_IF([test "$RANLIB" = ""], [
             MAKE_LIB='$(STLIB_LD) [$]@ ${OBJS}'
-            INSTALL_LIB='$(INSTALL_LIBRARY) $(LIB_FILE) "$(LIB_INSTALL_DIR)/$(LIB_FILE)"'
         ], [
             MAKE_LIB='${STLIB_LD} [$]@ ${OBJS} ; ${RANLIB} [$]@'
-            INSTALL_LIB='$(INSTALL_LIBRARY) $(LIB_FILE) "$(LIB_INSTALL_DIR)/$(LIB_FILE)" ; (cd "$(LIB_INSTALL_DIR)" ; $(RANLIB) $(LIB_FILE))'
         ])
+        INSTALL_LIB='$(INSTALL_LIBRARY) $(LIB_FILE) "$(LIB_INSTALL_DIR)/$(LIB_FILE)"'
     ])
 
     # Stub lib does not depend on shared/static configuration
     AS_IF([test "$RANLIB" = ""], [
         MAKE_STUB_LIB='${STLIB_LD} [$]@ ${STUB_LIB_OBJS}'
-        INSTALL_STUB_LIB='$(INSTALL_LIBRARY) $(STUB_LIB_FILE) "$(LIB_INSTALL_DIR)/$(STUB_LIB_FILE)"'
     ], [
         MAKE_STUB_LIB='${STLIB_LD} [$]@ ${STUB_LIB_OBJS} ; ${RANLIB} [$]@'
-        INSTALL_STUB_LIB='$(INSTALL_LIBRARY) $(STUB_LIB_FILE) "$(LIB_INSTALL_DIR)/$(STUB_LIB_FILE)" ; (cd "$(LIB_INSTALL_DIR)" ; $(RANLIB) $(STUB_LIB_FILE))'
     ])
+    INSTALL_STUB_LIB='$(INSTALL_LIBRARY) $(STUB_LIB_FILE) "$(LIB_INSTALL_DIR)/$(STUB_LIB_FILE)"'
 
     # Define TCL_LIBS now that we know what DL_LIBS is.
     # The trick here is that we don't want to change the value of TCL_LIBS if
@@ -2160,7 +2198,6 @@ dnl # preprocessing tests use only CPPFLAGS.
 #	Defines some of the following vars:
 #		NO_DIRENT_H
 #		NO_VALUES_H
-#		HAVE_LIMITS_H or NO_LIMITS_H
 #		NO_STDLIB_H
 #		NO_STRING_H
 #		NO_SYS_WAIT_H
@@ -2200,9 +2237,6 @@ closedir(d);
 
     AC_CHECK_HEADER(float.h, , [AC_DEFINE(NO_FLOAT_H, 1, [Do we have <float.h>?])])
     AC_CHECK_HEADER(values.h, , [AC_DEFINE(NO_VALUES_H, 1, [Do we have <values.h>?])])
-    AC_CHECK_HEADER(limits.h,
-	[AC_DEFINE(HAVE_LIMITS_H, 1, [Do we have <limits.h>?])],
-	[AC_DEFINE(NO_LIMITS_H, 1, [Do we have <limits.h>?])])
     AC_CHECK_HEADER(stdlib.h, tcl_ok=1, tcl_ok=0)
     AC_EGREP_HEADER(strtol, stdlib.h, , tcl_ok=0)
     AC_EGREP_HEADER(strtoul, stdlib.h, , tcl_ok=0)
diff --git a/unix/tcl.pc.in b/unix/tcl.pc.in
index 8bf67cd..846cb11 100644
--- a/unix/tcl.pc.in
+++ b/unix/tcl.pc.in
@@ -8,8 +8,8 @@ includedir=@includedir@
 Name: Tool Command Language
 Description: Tcl is a powerful, easy-to-learn dynamic programming language, suitable for a wide range of uses.
 URL: http://www.tcl.tk/
-Version: @TCL_VERSION@
-Requires:
-Conflicts:
-Libs: -L${libdir} @TCL_LIBS@
+Version: @TCL_VERSION@@TCL_PATCH_LEVEL@
+Requires.private: zlib >= 1.2.3
+Libs: -L${libdir} @TCL_LIB_FLAG@ @TCL_STUB_LIB_FLAG@
+Libs.private: @TCL_LIBS@
 Cflags: -I${includedir}
diff --git a/unix/tcl.spec b/unix/tcl.spec
index 678222c..1b8693f 100644
--- a/unix/tcl.spec
+++ b/unix/tcl.spec
@@ -4,7 +4,7 @@
 
 Name:          tcl
 Summary:       Tcl scripting language development environment
-Version:       8.6.1
+Version:       8.6.4
 Release:       2
 License:       BSD
 Group:         Development/Languages
@@ -30,7 +30,7 @@ CFLAGS="%optflags" ./configure \
 	--prefix=%{directory} \
 	--exec-prefix=%{directory} \
 	--libdir=%{directory}/%{_lib}
-make 
+make
 
 %install
 cd unix
diff --git a/unix/tclConfig.h.in b/unix/tclConfig.h.in
index e55dcd0..6972664 100644
--- a/unix/tclConfig.h.in
+++ b/unix/tclConfig.h.in
@@ -130,9 +130,6 @@
 /* Define to 1 if you have the <libkern/OSAtomic.h> header file. */
 #undef HAVE_LIBKERN_OSATOMIC_H
 
-/* Do we have <limits.h>? */
-#undef HAVE_LIMITS_H
-
 /* Define to 1 if you have the `localtime_r' function. */
 #undef HAVE_LOCALTIME_R
 
@@ -316,9 +313,6 @@
 /* Do we have a usable 'isnan'? */
 #undef NO_ISNAN
 
-/* Do we have <limits.h>? */
-#undef NO_LIMITS_H
-
 /* Do we have memmove()? */
 #undef NO_MEMMOVE
 
diff --git a/unix/tclConfig.sh.in b/unix/tclConfig.sh.in
index d47e686..b58e9fd 100644
--- a/unix/tclConfig.sh.in
+++ b/unix/tclConfig.sh.in
@@ -165,5 +165,5 @@ TCL_BUILD_STUB_LIB_PATH='@TCL_BUILD_STUB_LIB_PATH@'
 # Path to the Tcl stub library in the install directory.
 TCL_STUB_LIB_PATH='@TCL_STUB_LIB_PATH@'
 
-# Flag, 1: we built Tcl with threads enables, 0 we didn't
+# Flag, 1: we built Tcl with threads enabled, 0 we didn't
 TCL_THREADS=@TCL_THREADS@
diff --git a/unix/tclLoadDyld.c b/unix/tclLoadDyld.c
index 50c283d..8b7dc58 100644
--- a/unix/tclLoadDyld.c
+++ b/unix/tclLoadDyld.c
@@ -48,6 +48,7 @@
 #endif /* TCL_DYLD_USE_DLFCN */
 
 #if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 #include <mach-o/dyld.h>
 #include <mach-o/fat.h>
 #include <mach-o/swap.h>
diff --git a/unix/tclUnixChan.c b/unix/tclUnixChan.c
index fdc9d1d..b4b2739 100644
--- a/unix/tclUnixChan.c
+++ b/unix/tclUnixChan.c
@@ -792,7 +792,7 @@ TtySetOptionProc(
  *
  * Results:
  *	A standard Tcl result. Also sets the supplied DString to the string
- *	value of the option(s) returned.  Sets error message if needed 
+ *	value of the option(s) returned.  Sets error message if needed
  *	(by calling Tcl_BadChannelOption).
  *
  *----------------------------------------------------------------------
@@ -988,6 +988,39 @@ static const struct {int baud; speed_t speed;} speeds[] = {
 #ifdef B460800
     {460800, B460800},
 #endif
+#ifdef B500000
+    {500000, B500000},
+#endif
+#ifdef B576000
+    {576000, B576000},
+#endif
+#ifdef B921600
+    {921600, B921600},
+#endif
+#ifdef B1000000
+    {1000000, B1000000},
+#endif
+#ifdef B1152000
+    {1152000, B1152000},
+#endif
+#ifdef B1500000
+    {1500000,B1500000},
+#endif
+#ifdef B2000000
+    {2000000, B2000000},
+#endif
+#ifdef B2500000
+    {2500000,B2500000},
+#endif
+#ifdef B3000000
+    {3000000,B3000000},
+#endif
+#ifdef B3500000
+    {3500000,B3500000},
+#endif
+#ifdef B4000000
+    {4000000,B4000000},
+#endif
     {-1, 0}
 };
 
@@ -1201,7 +1234,7 @@ TtyParseMode(
     char parity;
     const char *bad = "bad value for -mode";
 
-    i = sscanf(mode, "%d,%c,%d,%d%n", 
+    i = sscanf(mode, "%d,%c,%d,%d%n",
 	    &ttyPtr->baud,
 	    &parity,
 	    &ttyPtr->data,
@@ -1292,7 +1325,7 @@ TtyInit(
 	    || iostate.c_lflag != 0
 	    || iostate.c_cflag & CREAD
 	    || iostate.c_cc[VMIN] != 1
-	    || iostate.c_cc[VTIME] != 0) 
+	    || iostate.c_cc[VTIME] != 0)
     {
 	iostate.c_iflag = IGNBRK;
 	iostate.c_oflag = 0;
@@ -1361,6 +1394,11 @@ TclpOpenFileChannel(
 
     native = Tcl_FSGetNativePath(pathPtr);
     if (native == NULL) {
+	if (interp != (Tcl_Interp *) NULL) {
+	    Tcl_AppendResult(interp, "couldn't open \"",
+	    TclGetString(pathPtr), "\": filename is invalid on this platform",
+	    NULL);
+	}
 	return NULL;
     }
 
@@ -1819,7 +1857,7 @@ TclUnixWaitForFile(
 	    if (FD_ISSET(fd, &writableMask)) {
 		SET_BITS(result, TCL_WRITABLE);
 	    }
-	    if (FD_ISSET(fd, &exceptionMask)) { 
+	    if (FD_ISSET(fd, &exceptionMask)) {
 		SET_BITS(result, TCL_EXCEPTION);
 	    }
 	    result &= mask;
diff --git a/unix/tclUnixFCmd.c b/unix/tclUnixFCmd.c
index e270b6a..3b1b6ca 100644
--- a/unix/tclUnixFCmd.c
+++ b/unix/tclUnixFCmd.c
@@ -91,10 +91,10 @@ static int		SetPermissionsAttribute(Tcl_Interp *interp,
 			    Tcl_Obj *attributePtr);
 static int		GetModeFromPermString(Tcl_Interp *interp,
 			    const char *modeStringPtr, mode_t *modePtr);
-#if defined(HAVE_CHFLAGS) && defined(UF_IMMUTABLE)
-static int		GetReadOnlyAttribute(Tcl_Interp *interp, int objIndex,
+#if defined(HAVE_CHFLAGS) && defined(UF_IMMUTABLE) || defined(__CYGWIN__)
+static int		GetUnixFileAttributes(Tcl_Interp *interp, int objIndex,
 			    Tcl_Obj *fileName, Tcl_Obj **attributePtrPtr);
-static int		SetReadOnlyAttribute(Tcl_Interp *interp, int objIndex,
+static int		SetUnixFileAttributes(Tcl_Interp *interp, int objIndex,
 			    Tcl_Obj *fileName, Tcl_Obj *attributePtr);
 #endif
 
@@ -124,10 +124,20 @@ extern const char *const tclpFileAttrStrings[];
 
 #else /* !DJGPP */
 enum {
-    UNIX_GROUP_ATTRIBUTE, UNIX_OWNER_ATTRIBUTE, UNIX_PERMISSIONS_ATTRIBUTE,
-#if defined(HAVE_CHFLAGS) && defined(UF_IMMUTABLE)
+#if defined(__CYGWIN__)
+    UNIX_ARCHIVE_ATTRIBUTE,
+#endif
+    UNIX_GROUP_ATTRIBUTE,
+#if defined(__CYGWIN__)
+    UNIX_HIDDEN_ATTRIBUTE,
+#endif
+    UNIX_OWNER_ATTRIBUTE, UNIX_PERMISSIONS_ATTRIBUTE,
+#if defined(HAVE_CHFLAGS) && defined(UF_IMMUTABLE) || defined(__CYGWIN__)
     UNIX_READONLY_ATTRIBUTE,
 #endif
+#if defined(__CYGWIN__)
+    UNIX_SYSTEM_ATTRIBUTE,
+#endif
 #ifdef MAC_OSX_TCL
     MACOSX_CREATOR_ATTRIBUTE, MACOSX_TYPE_ATTRIBUTE, MACOSX_HIDDEN_ATTRIBUTE,
     MACOSX_RSRCLENGTH_ATTRIBUTE,
@@ -137,10 +147,20 @@ enum {
 
 MODULE_SCOPE const char *const tclpFileAttrStrings[];
 const char *const tclpFileAttrStrings[] = {
-    "-group", "-owner", "-permissions",
-#if defined(HAVE_CHFLAGS) && defined(UF_IMMUTABLE)
+#if defined(__CYGWIN__)
+    "-archive",
+#endif
+    "-group",
+#if defined(__CYGWIN__)
+    "-hidden",
+#endif
+    "-owner", "-permissions",
+#if defined(HAVE_CHFLAGS) && defined(UF_IMMUTABLE) || defined(__CYGWIN__)
     "-readonly",
 #endif
+#if defined(__CYGWIN__)
+    "-system",
+#endif
 #ifdef MAC_OSX_TCL
     "-creator", "-type", "-hidden", "-rsrclength",
 #endif
@@ -149,11 +169,20 @@ const char *const tclpFileAttrStrings[] = {
 
 MODULE_SCOPE const TclFileAttrProcs tclpFileAttrProcs[];
 const TclFileAttrProcs tclpFileAttrProcs[] = {
+#if defined(__CYGWIN__)
+    {GetUnixFileAttributes, SetUnixFileAttributes},
+#endif
     {GetGroupAttribute, SetGroupAttribute},
+#if defined(__CYGWIN__)
+    {GetUnixFileAttributes, SetUnixFileAttributes},
+#endif
     {GetOwnerAttribute, SetOwnerAttribute},
     {GetPermissionsAttribute, SetPermissionsAttribute},
-#if defined(HAVE_CHFLAGS) && defined(UF_IMMUTABLE)
-    {GetReadOnlyAttribute, SetReadOnlyAttribute},
+#if defined(HAVE_CHFLAGS) && defined(UF_IMMUTABLE) || defined(__CYGWIN__)
+    {GetUnixFileAttributes, SetUnixFileAttributes},
+#endif
+#if defined(__CYGWIN__)
+    {GetUnixFileAttributes, SetUnixFileAttributes},
 #endif
 #ifdef MAC_OSX_TCL
     {TclMacOSXGetFileAttribute,	TclMacOSXSetFileAttribute},
@@ -2246,11 +2275,138 @@ DefaultTempDir(void)
     return TCL_TEMPORARY_FILE_DIRECTORY;
 }
 
-#if defined(HAVE_CHFLAGS) && defined(UF_IMMUTABLE)
+#if defined(__CYGWIN__)
+
+static void
+StatError(
+    Tcl_Interp *interp,		/* The interp that has the error */
+    Tcl_Obj *fileName)		/* The name of the file which caused the
+				 * error. */
+{
+    TclWinConvertError(GetLastError());
+    Tcl_SetObjResult(interp, Tcl_ObjPrintf("could not read \"%s\": %s",
+	    TclGetString(fileName), Tcl_PosixError(interp)));
+}
+
+static WCHAR *
+winPathFromObj(
+    Tcl_Obj *fileName)
+{
+    int size;
+    const char *native =  Tcl_FSGetNativePath(fileName);
+    WCHAR *winPath;
+
+    size = cygwin_conv_path(1, native, NULL, 0);
+    winPath = ckalloc(size);
+    cygwin_conv_path(1, native, winPath, size);
+
+    return winPath;
+}
+
+static const int attributeArray[] = {
+    0x20, 0, 2, 0, 0, 1, 4};
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * GetUnixFileAttributes
+ *
+ *	Gets the readonly attribute of a file.
+ *
+ * Results:
+ *	Standard TCL result. Returns a new Tcl_Obj in attributePtrPtr if there
+ *	is no error. The object will have ref count 0.
+ *
+ * Side effects:
+ *	A new object is allocated.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int
+GetUnixFileAttributes(
+    Tcl_Interp *interp,		/* The interp we are using for errors. */
+    int objIndex,		/* The index of the attribute. */
+    Tcl_Obj *fileName,		/* The name of the file (UTF-8). */
+    Tcl_Obj **attributePtrPtr)	/* A pointer to return the object with. */
+{
+    int fileAttributes;
+    WCHAR *winPath = winPathFromObj(fileName);
+
+    fileAttributes = GetFileAttributesW(winPath);
+    ckfree(winPath);
+
+    if (fileAttributes == -1) {
+	StatError(interp, fileName);
+	return TCL_ERROR;
+    }
+
+    *attributePtrPtr = Tcl_NewIntObj((fileAttributes&attributeArray[objIndex])!=0);
+
+    return TCL_OK;
+}
+
+/*
+ *---------------------------------------------------------------------------
+ *
+ * SetUnixFileAttributes
+ *
+ *	Sets the readonly attribute of a file.
+ *
+ * Results:
+ *	Standard TCL result.
+ *
+ * Side effects:
+ *	The readonly attribute of the file is changed.
+ *
+ *---------------------------------------------------------------------------
+ */
+
+static int
+SetUnixFileAttributes(
+    Tcl_Interp *interp,	    /* The interp we are using for errors. */
+    int objIndex,           /* The index of the attribute. */
+    Tcl_Obj *fileName,      /* The name of the file (UTF-8). */
+    Tcl_Obj *attributePtr)  /* The attribute to set. */
+{
+    int yesNo, fileAttributes, old;
+    WCHAR *winPath;
+
+    if (Tcl_GetBooleanFromObj(interp, attributePtr, &yesNo) != TCL_OK) {
+	return TCL_ERROR;
+    }
+
+    winPath = winPathFromObj(fileName);
+
+    fileAttributes = old = GetFileAttributesW(winPath);
+
+    if (fileAttributes == -1) {
+	ckfree(winPath);
+	StatError(interp, fileName);
+	return TCL_ERROR;
+    }
+
+    if (yesNo) {
+	fileAttributes |= attributeArray[objIndex];
+    } else {
+	fileAttributes &= ~attributeArray[objIndex];
+    }
+
+    if ((fileAttributes != old)
+	    && !SetFileAttributesW(winPath, fileAttributes)) {
+	ckfree(winPath);
+	StatError(interp, fileName);
+	return TCL_ERROR;
+    }
+
+	ckfree(winPath);
+    return TCL_OK;
+}
+#elif defined(HAVE_CHFLAGS) && defined(UF_IMMUTABLE)
 /*
  *----------------------------------------------------------------------
  *
- * GetReadOnlyAttribute
+ * GetUnixFileAttributes
  *
  *	Gets the readonly attribute (user immutable flag) of a file.
  *
@@ -2265,7 +2421,7 @@ DefaultTempDir(void)
  */
 
 static int
-GetReadOnlyAttribute(
+GetUnixFileAttributes(
     Tcl_Interp *interp,		/* The interp we are using for errors. */
     int objIndex,		/* The index of the attribute. */
     Tcl_Obj *fileName,		/* The name of the file (UTF-8). */
@@ -2293,7 +2449,7 @@ GetReadOnlyAttribute(
 /*
  *---------------------------------------------------------------------------
  *
- * SetReadOnlyAttribute
+ * SetUnixFileAttributes
  *
  *	Sets the readonly attribute (user immutable flag) of a file.
  *
@@ -2307,7 +2463,7 @@ GetReadOnlyAttribute(
  */
 
 static int
-SetReadOnlyAttribute(
+SetUnixFileAttributes(
     Tcl_Interp *interp,		/* The interp we are using for errors. */
     int objIndex,		/* The index of the attribute. */
     Tcl_Obj *fileName,		/* The name of the file (UTF-8). */
diff --git a/unix/tclUnixFile.c b/unix/tclUnixFile.c
index 5bfe5d9..7ffbf8d 100644
--- a/unix/tclUnixFile.c
+++ b/unix/tclUnixFile.c
@@ -155,6 +155,11 @@ TclpFindExecutable(
 	goto done;
     }
 
+    if (TclpGetCwd(NULL, &cwd) == NULL) {
+	TclSetObjNameOfExecutable(Tcl_NewObj(), NULL);
+	goto done;
+    }
+
     /*
      * The name is relative to the current working directory. First strip off
      * a leading "./", if any, then add the full path name of the current
@@ -168,8 +173,6 @@ TclpFindExecutable(
     Tcl_DStringInit(&nameString);
     Tcl_DStringAppend(&nameString, name, -1);
 
-    TclpGetCwd(NULL, &cwd);
-
     Tcl_DStringFree(&buffer);
     Tcl_UtfToExternalDString(NULL, Tcl_DStringValue(&cwd),
 	    Tcl_DStringLength(&cwd), &buffer);
@@ -1105,6 +1108,12 @@ TclNativeCreateNativeRep(
     str = Tcl_GetStringFromObj(validPathPtr, &len);
     Tcl_UtfToExternalDString(NULL, str, len, &ds);
     len = Tcl_DStringLength(&ds) + sizeof(char);
+    if (strlen(Tcl_DStringValue(&ds)) < len - sizeof(char)) {
+	/* See bug [3118489]: NUL in filenames */
+	Tcl_DecrRefCount(validPathPtr);
+	Tcl_DStringFree(&ds);
+	return NULL;
+    }
     Tcl_DecrRefCount(validPathPtr);
     nativePathPtr = ckalloc(len);
     memcpy(nativePathPtr, Tcl_DStringValue(&ds), (size_t) len);
diff --git a/unix/tclUnixInit.c b/unix/tclUnixInit.c
index f07b123..5fc0035 100644
--- a/unix/tclUnixInit.c
+++ b/unix/tclUnixInit.c
@@ -33,7 +33,10 @@
 #endif
 
 #ifdef __CYGWIN__
-DLLIMPORT extern __stdcall unsigned char GetVersionExA(void *);
+DLLIMPORT extern __stdcall unsigned char GetVersionExW(void *);
+DLLIMPORT extern __stdcall void *LoadLibraryW(const void *);
+DLLIMPORT extern __stdcall void FreeLibrary(void *);
+DLLIMPORT extern __stdcall void *GetProcAddress(void *, const char *);
 DLLIMPORT extern __stdcall void GetSystemInfo(void *);
 
 #define NUMPLATFORMS 4
@@ -66,14 +69,14 @@ typedef struct _SYSTEM_INFO {
   int      wProcessorRevision;
 } SYSTEM_INFO;
 
-typedef struct _OSVERSIONINFOA {
+typedef struct _OSVERSIONINFOW {
   DWORD dwOSVersionInfoSize;
   DWORD dwMajorVersion;
   DWORD dwMinorVersion;
   DWORD dwBuildNumber;
   DWORD dwPlatformId;
-  char szCSDVersion[128];
-} OSVERSIONINFOA;
+  wchar_t szCSDVersion[128];
+} OSVERSIONINFOW;
 #endif
 
 #ifdef HAVE_COREFOUNDATION
@@ -599,7 +602,7 @@ SearchKnownEncodings(
     int left = 0;
     int right = sizeof(localeTable)/sizeof(LocaleTable);
 
-    while (left <= right) {
+    while (left < right) {
 	int test = (left + right)/2;
 	int code = strcmp(localeTable[test].lang, encoding);
 
@@ -747,7 +750,8 @@ TclpSetVariables(
 {
 #ifdef __CYGWIN__
     SYSTEM_INFO sysInfo;
-    OSVERSIONINFOA osInfo;
+    static OSVERSIONINFOW osInfo;
+    static int osInfoInitialized = 0;
     char buffer[TCL_INTEGER_SPACE * 2];
 #elif !defined(NO_UNAME)
     struct utsname name;
@@ -764,7 +768,7 @@ TclpSetVariables(
      */
 
     CFLocaleRef localeRef;
-    
+
     if (CFLocaleCopyCurrent != NULL && CFLocaleGetIdentifier != NULL &&
 	    (localeRef = CFLocaleCopyCurrent())) {
 	CFStringRef locale = CFLocaleGetIdentifier(localeRef);
@@ -860,8 +864,20 @@ TclpSetVariables(
     unameOK = 0;
 #ifdef __CYGWIN__
 	unameOK = 1;
-    osInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFOA);
-    GetVersionExA(&osInfo);
+    if (!osInfoInitialized) {
+	HANDLE handle = LoadLibraryW(L"NTDLL");
+	int(__stdcall *getversion)(void *) =
+		(int(__stdcall *)(void *))GetProcAddress(handle, "RtlGetVersion");
+	osInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFOW);
+	if (!getversion || getversion(&osInfo)) {
+	    GetVersionExW(&osInfo);
+	}
+	if (handle) {
+	    FreeLibrary(handle);
+	}
+	osInfoInitialized = 1;
+    }
+
     GetSystemInfo(&sysInfo);
 
     if (osInfo.dwPlatformId < NUMPLATFORMS) {
diff --git a/unix/tclUnixNotfy.c b/unix/tclUnixNotfy.c
index b234667..2b648ca 100644
--- a/unix/tclUnixNotfy.c
+++ b/unix/tclUnixNotfy.c
@@ -1,3 +1,5 @@
+#define AT_FORK_INIT_VALUE 0
+#define RESET_ATFORK_MUTEX 1
 /*
  * tclUnixNotify.c --
  *
@@ -97,10 +99,11 @@ typedef struct ThreadSpecificData {
 	 * by sending this event. */
     void *hwnd;			/* Messaging window. */
 #else /* !__CYGWIN__ */
-    Tcl_Condition waitCV;	/* Any other thread alerts a notifier that an
+    pthread_cond_t waitCV;	/* Any other thread alerts a notifier that an
 				 * event is ready to be processed by signaling
 				 * this condition variable. */
 #endif /* __CYGWIN__ */
+    int waitCVinitialized;  /* Variable to flag initialization of the structure */
     int eventReady;		/* True if an event is ready to be processed.
 				 * Used as condition flag together with waitCV
 				 * above. */
@@ -120,15 +123,6 @@ static Tcl_ThreadDataKey dataKey;
 static int notifierCount = 0;
 
 /*
- * The following static stores the process ID of the initialized notifier
- * thread. If it changes, we have passed a fork and we should start a new
- * notifier thread.
- *
- * You must hold the notifierMutex lock before accessing this variable.
- */
-static pid_t processIDInitialized = 0;
-
-/*
  * The following variable points to the head of a doubly-linked list of
  * ThreadSpecificData structures for all threads that are currently waiting on
  * an event.
@@ -158,7 +152,15 @@ static int triggerPipe = -1;
  * The notifierMutex locks access to all of the global notifier state.
  */
 
-TCL_DECLARE_MUTEX(notifierMutex)
+pthread_mutex_t notifierInitMutex = PTHREAD_MUTEX_INITIALIZER;
+pthread_mutex_t notifierMutex     = PTHREAD_MUTEX_INITIALIZER;
+/*
+ * The following static indicates if the notifier thread is running.
+ *
+ * You must hold the notifierInitMutex before accessing this variable.
+ */
+
+static int notifierThreadRunning = 0;
 
 /*
  * The notifier thread signals the notifierCV when it has finished
@@ -166,7 +168,7 @@ TCL_DECLARE_MUTEX(notifierMutex)
  * terminates.
  */
 
-static Tcl_Condition notifierCV;
+static pthread_cond_t notifierCV = PTHREAD_COND_INITIALIZER;
 
 /*
  * The pollState bits
@@ -194,15 +196,15 @@ static Tcl_ThreadId notifierThread;
 
 #ifdef TCL_THREADS
 static void	NotifierThreadProc(ClientData clientData);
-#if defined(HAVE_PTHREAD_ATFORK) && !defined(__APPLE__) && !defined(__hpux)
-static int	atForkInit = 0;
+#if defined(HAVE_PTHREAD_ATFORK)
+static int	atForkInit = AT_FORK_INIT_VALUE;
 static void	AtForkPrepare(void);
 static void	AtForkParent(void);
 static void	AtForkChild(void);
 #endif /* HAVE_PTHREAD_ATFORK */
 #endif /* TCL_THREADS */
 static int	FileHandlerEventProc(Tcl_Event *evPtr, int flags);
-
+
 /*
  * Import of Windows API when building threaded with Cygwin.
  */
@@ -251,13 +253,58 @@ extern unsigned char __stdcall	ResetEvent(void *);
 extern unsigned char __stdcall	TranslateMessage(const MSG *);
 
 /*
- * Threaded-cygwin specific functions in this file:
+ * Threaded-cygwin specific constants and functions in this file:
  */
 
+static const WCHAR NotfyClassName[] = L"TclNotifier";
 static DWORD __stdcall	NotifierProc(void *hwnd, unsigned int message,
 			    void *wParam, void *lParam);
 #endif /* TCL_THREADS && __CYGWIN__ */
 
+#if TCL_THREADS
+/*
+ *----------------------------------------------------------------------
+ *
+ * StartNotifierThread --
+ *
+ *	Start a notfier thread and wait for the notifier pipe to be created.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	Running Thread.
+ *
+ *----------------------------------------------------------------------
+ */
+static void
+StartNotifierThread(const char *proc)
+{
+    if (!notifierThreadRunning) {
+	pthread_mutex_lock(&notifierInitMutex);
+	if (!notifierThreadRunning) {
+	    if (TclpThreadCreate(&notifierThread, NotifierThreadProc, NULL,
+		    TCL_THREAD_STACK_DEFAULT, TCL_THREAD_JOINABLE) != TCL_OK) {
+		Tcl_Panic("%s: unable to start notifier thread", proc);
+	    }
+
+	    pthread_mutex_lock(&notifierMutex);
+	    /*
+	     * Wait for the notifier pipe to be created.
+	     */
+
+	    while (triggerPipe < 0) {
+		pthread_cond_wait(&notifierCV, &notifierMutex);
+	    }
+	    pthread_mutex_unlock(&notifierMutex);
+
+	    notifierThreadRunning = 1;
+	}
+	pthread_mutex_unlock(&notifierInitMutex);
+    }
+}
+#endif /* TCL_THREADS */
+
 /*
  *----------------------------------------------------------------------
  *
@@ -286,13 +333,39 @@ Tcl_InitNotifier(void)
 	tsdPtr->eventReady = 0;
 
 	/*
-	 * Start the Notifier thread if necessary.
+	 * Initialize thread specific condition variable for this thread.
 	 */
+	if (tsdPtr->waitCVinitialized == 0) {
+#ifdef __CYGWIN__
+	    WNDCLASS class;
+
+	    class.style = 0;
+	    class.cbClsExtra = 0;
+	    class.cbWndExtra = 0;
+	    class.hInstance = TclWinGetTclInstance();
+	    class.hbrBackground = NULL;
+	    class.lpszMenuName = NULL;
+	    class.lpszClassName = NotfyClassName;
+	    class.lpfnWndProc = NotifierProc;
+	    class.hIcon = NULL;
+	    class.hCursor = NULL;
+
+	    RegisterClassW(&class);
+	    tsdPtr->hwnd = CreateWindowExW(NULL, class.lpszClassName,
+		    class.lpszClassName, 0, 0, 0, 0, 0, NULL, NULL,
+		    TclWinGetTclInstance(), NULL);
+	    tsdPtr->event = CreateEventW(NULL, 1 /* manual */,
+		    0 /* !signaled */, NULL);
+#else
+	    pthread_cond_init(&tsdPtr->waitCV, NULL);
+#endif /* __CYGWIN__ */
+	    tsdPtr->waitCVinitialized = 1;
+	}
 
-	Tcl_MutexLock(&notifierMutex);
-#if defined(HAVE_PTHREAD_ATFORK) && !defined(__APPLE__) && !defined(__hpux)
+	pthread_mutex_lock(&notifierInitMutex);
+#if defined(HAVE_PTHREAD_ATFORK)
 	/*
-	 * Install pthread_atfork handlers to reinitialize the notifier in the
+	 * Install pthread_atfork handlers to clean up the notifier in the
 	 * child of a fork.
 	 */
 
@@ -305,35 +378,11 @@ Tcl_InitNotifier(void)
 	    atForkInit = 1;
 	}
 #endif /* HAVE_PTHREAD_ATFORK */
-	/*
-	 * Check if my process id changed, e.g. I was forked
-	 * In this case, restart the notifier thread and close the
-	 * pipe to the original notifier thread
-	 */
-	if (notifierCount > 0 && processIDInitialized != getpid()) {
-	    notifierCount = 0;
-	    processIDInitialized = 0;
-	    close(triggerPipe);
-	    triggerPipe = -1;
-	}
-	if (notifierCount == 0) {
-	    if (TclpThreadCreate(&notifierThread, NotifierThreadProc, NULL,
-		    TCL_THREAD_STACK_DEFAULT, TCL_THREAD_JOINABLE) != TCL_OK) {
-		Tcl_Panic("Tcl_InitNotifier: unable to start notifier thread");
-	    }
-	    processIDInitialized = getpid();
-	}
-	notifierCount++;
 
-	/*
-	 * Wait for the notifier pipe to be created.
-	 */
+	notifierCount++;
 
-	while (triggerPipe < 0) {
-	    Tcl_ConditionWait(&notifierCV, &notifierMutex, NULL);
-	}
+	pthread_mutex_unlock(&notifierInitMutex);
 
-	Tcl_MutexUnlock(&notifierMutex);
 #endif /* TCL_THREADS */
 	return tsdPtr;
     }
@@ -368,7 +417,7 @@ Tcl_FinalizeNotifier(
 #ifdef TCL_THREADS
 	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
 
-	Tcl_MutexLock(&notifierMutex);
+	pthread_mutex_lock(&notifierInitMutex);
 	notifierCount--;
 
 	/*
@@ -377,37 +426,25 @@ Tcl_FinalizeNotifier(
 	 */
 
 	if (notifierCount == 0) {
-	    int result;
-
-	    if (triggerPipe < 0) {
-		Tcl_Panic("Tcl_FinalizeNotifier: %s",
-			"notifier pipe not initialized");
-	    }
 
-	    /*
-	     * Send "q" message to the notifier thread so that it will
-	     * terminate. The notifier will return from its call to select()
-	     * and notice that a "q" message has arrived, it will then close
-	     * its side of the pipe and terminate its thread. Note the we can
-	     * not just close the pipe and check for EOF in the notifier thread
-	     * because if a background child process was created with exec,
-	     * select() would not register the EOF on the pipe until the child
-	     * processes had terminated. [Bug: 4139] [Bug: 1222872]
-	     */
-
-	    if (write(triggerPipe, "q", 1) != 1) {
-		Tcl_Panic("Tcl_FinalizeNotifier: %s",
-			"unable to write q to triggerPipe");
-	    }
-	    close(triggerPipe);
-	    while(triggerPipe >= 0) {
-		Tcl_ConditionWait(&notifierCV, &notifierMutex, NULL);
-	    }
+	    if (triggerPipe != -1) {
+		if (write(triggerPipe, "q", 1) != 1) {
+		    Tcl_Panic("Tcl_FinalizeNotifier: %s",
+			    "unable to write q to triggerPipe");
+		}
+		close(triggerPipe);
+		while(triggerPipe != -1) {
+		    pthread_cond_wait(&notifierCV, &notifierMutex);
+		}
+		if (notifierThreadRunning) {
+		    int result = pthread_join((pthread_t) notifierThread, NULL);
 
-	    result = Tcl_JoinThread(notifierThread, NULL);
-	    if (result) {
-		Tcl_Panic("Tcl_FinalizeNotifier: %s",
-			"unable to join notifier thread");
+		    if (result) {
+			Tcl_Panic("Tcl_FinalizeNotifier: unable to join notifier "
+				"thread");
+		    }
+		    notifierThreadRunning = 0;
+		}
 	    }
 	}
 
@@ -416,12 +453,14 @@ Tcl_FinalizeNotifier(
 	 */
 
 #ifdef __CYGWIN__
+	DestroyWindow(tsdPtr->hwnd);
 	CloseHandle(tsdPtr->event);
 #else /* __CYGWIN__ */
-	Tcl_ConditionFinalize(&(tsdPtr->waitCV));
+	pthread_cond_destroy(&tsdPtr->waitCV);
 #endif /* __CYGWIN__ */
+	tsdPtr->waitCVinitialized = 0;
 
-	Tcl_MutexUnlock(&notifierMutex);
+	pthread_mutex_unlock(&notifierInitMutex);
 #endif /* TCL_THREADS */
     }
 }
@@ -456,14 +495,15 @@ Tcl_AlertNotifier(
 #ifdef TCL_THREADS
 	ThreadSpecificData *tsdPtr = clientData;
 
-	Tcl_MutexLock(&notifierMutex);
+	pthread_mutex_lock(&notifierMutex);
 	tsdPtr->eventReady = 1;
+
 #   ifdef __CYGWIN__
 	PostMessageW(tsdPtr->hwnd, 1024, 0, 0);
 #   else
-	Tcl_ConditionNotify(&tsdPtr->waitCV);
+	pthread_cond_broadcast(&tsdPtr->waitCV);
 #   endif /* __CYGWIN__ */
-	Tcl_MutexUnlock(&notifierMutex);
+	pthread_mutex_unlock(&notifierMutex);
 #endif /* TCL_THREADS */
     }
 }
@@ -526,8 +566,10 @@ Tcl_ServiceModeHook(
     if (tclNotifierHooks.serviceModeHookProc) {
 	tclNotifierHooks.serviceModeHookProc(mode);
 	return;
-    } else {
-	/* Does nothing in this implementation. */
+    } else if (mode == TCL_SERVICE_ALL) {
+#if TCL_THREADS
+	StartNotifierThread("Tcl_ServiceModeHook");
+#endif
     }
 }
 
@@ -740,6 +782,7 @@ FileHandlerEventProc(
      */
 
     tsdPtr = TCL_TSD_INIT(&dataKey);
+
     for (filePtr = tsdPtr->firstFileHandlerPtr; filePtr != NULL;
 	    filePtr = filePtr->nextPtr) {
 	if (filePtr->fd != fileEvPtr->fd) {
@@ -877,35 +920,13 @@ Tcl_WaitForEvent(
 
 #ifdef TCL_THREADS
 	/*
-	 * Place this thread on the list of interested threads, signal the
-	 * notifier thread, and wait for a response or a timeout.
+	 * Start notifier thread and place this thread on the list of
+	 * interested threads, signal the notifier thread, and wait for a
+	 * response or a timeout.
 	 */
+	StartNotifierThread("Tcl_WaitForEvent");
 
-#ifdef __CYGWIN__
-	if (!tsdPtr->hwnd) {
-	    WNDCLASS class;
-
-	    class.style = 0;
-	    class.cbClsExtra = 0;
-	    class.cbWndExtra = 0;
-	    class.hInstance = TclWinGetTclInstance();
-	    class.hbrBackground = NULL;
-	    class.lpszMenuName = NULL;
-	    class.lpszClassName = L"TclNotifier";
-	    class.lpfnWndProc = NotifierProc;
-	    class.hIcon = NULL;
-	    class.hCursor = NULL;
-
-	    RegisterClassW(&class);
-	    tsdPtr->hwnd = CreateWindowExW(NULL, class.lpszClassName,
-		    class.lpszClassName, 0, 0, 0, 0, 0, NULL, NULL,
-		    TclWinGetTclInstance(), NULL);
-	    tsdPtr->event = CreateEventW(NULL, 1 /* manual */,
-		    0 /* !signaled */, NULL);
-	}
-#endif /* __CYGWIN */
-
-	Tcl_MutexLock(&notifierMutex);
+	pthread_mutex_lock(&notifierMutex);
 
 	if (timePtr != NULL && timePtr->sec == 0 && (timePtr->usec == 0
 #if defined(__APPLE__) && defined(__LP64__)
@@ -970,12 +991,23 @@ Tcl_WaitForEvent(
 		} else {
 		    timeout = 0xFFFFFFFF;
 		}
-		Tcl_MutexUnlock(&notifierMutex);
+		pthread_mutex_unlock(&notifierMutex);
 		MsgWaitForMultipleObjects(1, &tsdPtr->event, 0, timeout, 1279);
-		Tcl_MutexLock(&notifierMutex);
+		pthread_mutex_lock(&notifierMutex);
 	    }
 #else
-	    Tcl_ConditionWait(&tsdPtr->waitCV, &notifierMutex, timePtr);
+	    if (timePtr != NULL) {
+	       Tcl_Time now;
+	       struct timespec ptime;
+
+	       Tcl_GetTime(&now);
+	       ptime.tv_sec = timePtr->sec + now.sec + (timePtr->usec + now.usec) / 1000000;
+	       ptime.tv_nsec = 1000 * ((timePtr->usec + now.usec) % 1000000);
+
+	       pthread_cond_timedwait(&tsdPtr->waitCV, &notifierMutex, &ptime);
+	    } else {
+	       pthread_cond_wait(&tsdPtr->waitCV, &notifierMutex);
+	    }
 #endif /* __CYGWIN__ */
 	}
 	tsdPtr->eventReady = 0;
@@ -1078,7 +1110,7 @@ Tcl_WaitForEvent(
 	    filePtr->readyMask = mask;
 	}
 #ifdef TCL_THREADS
-	Tcl_MutexUnlock(&notifierMutex);
+	pthread_mutex_unlock(&notifierMutex);
 #endif /* TCL_THREADS */
 	return 0;
     }
@@ -1150,15 +1182,15 @@ NotifierThreadProc(
      * Install the write end of the pipe into the global variable.
      */
 
-    Tcl_MutexLock(&notifierMutex);
+    pthread_mutex_lock(&notifierMutex);
     triggerPipe = fds[1];
 
     /*
      * Signal any threads that are waiting.
      */
 
-    Tcl_ConditionNotify(&notifierCV);
-    Tcl_MutexUnlock(&notifierMutex);
+    pthread_cond_broadcast(&notifierCV);
+    pthread_mutex_unlock(&notifierMutex);
 
     /*
      * Look for file events and report them to interested threads.
@@ -1174,7 +1206,7 @@ NotifierThreadProc(
 	 * notifiers.
 	 */
 
-	Tcl_MutexLock(&notifierMutex);
+	pthread_mutex_lock(&notifierMutex);
 	timePtr = NULL;
 	for (tsdPtr = waitingListPtr; tsdPtr; tsdPtr = tsdPtr->nextPtr) {
 	    for (i = tsdPtr->numFdBits-1; i >= 0; --i) {
@@ -1201,7 +1233,7 @@ NotifierThreadProc(
 		timePtr = &poll;
 	    }
 	}
-	Tcl_MutexUnlock(&notifierMutex);
+	pthread_mutex_unlock(&notifierMutex);
 
 	/*
 	 * Set up the select mask to include the receive pipe.
@@ -1225,7 +1257,7 @@ NotifierThreadProc(
 	 * Alert any threads that are waiting on a ready file descriptor.
 	 */
 
-	Tcl_MutexLock(&notifierMutex);
+	pthread_mutex_lock(&notifierMutex);
 	for (tsdPtr = waitingListPtr; tsdPtr; tsdPtr = tsdPtr->nextPtr) {
 	    found = 0;
 
@@ -1271,12 +1303,12 @@ NotifierThreadProc(
 		}
 #ifdef __CYGWIN__
 		PostMessageW(tsdPtr->hwnd, 1024, 0, 0);
-#else
-		Tcl_ConditionNotify(&tsdPtr->waitCV);
+#else /* __CYGWIN__ */
+		pthread_cond_broadcast(&tsdPtr->waitCV);
 #endif /* __CYGWIN__ */
 	    }
 	}
-	Tcl_MutexUnlock(&notifierMutex);
+	pthread_mutex_unlock(&notifierMutex);
 
 	/*
 	 * Consume the next byte from the notifier pipe if the pipe was
@@ -1305,15 +1337,15 @@ NotifierThreadProc(
      */
 
     close(receivePipe);
-    Tcl_MutexLock(&notifierMutex);
+    pthread_mutex_lock(&notifierMutex);
     triggerPipe = -1;
-    Tcl_ConditionNotify(&notifierCV);
-    Tcl_MutexUnlock(&notifierMutex);
+    pthread_cond_broadcast(&notifierCV);
+    pthread_mutex_unlock(&notifierMutex);
 
     TclpThreadExit(0);
 }
 
-#if defined(HAVE_PTHREAD_ATFORK) && !defined(__APPLE__) && !defined(__hpux)
+#if defined(HAVE_PTHREAD_ATFORK)
 /*
  *----------------------------------------------------------------------
  *
@@ -1333,6 +1365,9 @@ NotifierThreadProc(
 static void
 AtForkPrepare(void)
 {
+#if RESET_ATFORK_MUTEX == 0
+    pthread_mutex_lock(&notifierInitMutex);
+#endif
 }
 
 /*
@@ -1354,6 +1389,9 @@ AtForkPrepare(void)
 static void
 AtForkParent(void)
 {
+#if RESET_ATFORK_MUTEX == 0
+    pthread_mutex_unlock(&notifierInitMutex);
+#endif
 }
 
 /*
@@ -1375,8 +1413,67 @@ AtForkParent(void)
 static void
 AtForkChild(void)
 {
-    notifierMutex = NULL;
-    notifierCV = NULL;
+    if (notifierThreadRunning == 1) {
+	pthread_cond_destroy(&notifierCV);
+    }
+#if RESET_ATFORK_MUTEX == 0
+    pthread_mutex_unlock(&notifierInitMutex);
+#else
+    pthread_mutex_init(&notifierInitMutex, NULL);
+    pthread_mutex_init(&notifierMutex, NULL);
+#endif
+    pthread_cond_init(&notifierCV, NULL);
+
+    /*
+     * notifierThreadRunning == 1: thread is running, (there might be data in notifier lists)
+     * atForkInit == 0: InitNotifier was never called
+     * notifierCount != 0: unbalanced  InitNotifier() / FinalizeNotifier calls
+     * waitingListPtr != 0: there are threads currently waiting for events.
+     */
+
+    if (atForkInit == 1) {
+
+	notifierCount = 0;
+	if (notifierThreadRunning == 1) {
+	    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
+	    notifierThreadRunning = 0;
+
+	    close(triggerPipe);
+	    triggerPipe = -1;
+	    /*
+	     * The waitingListPtr might contain event info from multiple
+	     * threads, which are invalid here, so setting it to NULL is not
+	     * unreasonable.
+	     */
+	    waitingListPtr = NULL;
+
+	    /*
+	     * The tsdPtr from before the fork is copied as well.  But since
+	     * we are paranoic, we don't trust its condvar and reset it.
+	     */
+#ifdef __CYGWIN__
+	    DestroyWindow(tsdPtr->hwnd);
+	    tsdPtr->hwnd = CreateWindowExW(NULL, NotfyClassName,
+		    NotfyClassName, 0, 0, 0, 0, 0, NULL, NULL,
+		    TclWinGetTclInstance(), NULL);
+	    ResetEvent(tsdPtr->event);
+#else
+	    pthread_cond_destroy(&tsdPtr->waitCV);
+	    pthread_cond_init(&tsdPtr->waitCV, NULL);
+#endif
+	    /*
+	     * In case, we had multiple threads running before the fork,
+	     * make sure, we don't try to reach out to their thread local data.
+	     */
+	    tsdPtr->nextPtr = tsdPtr->prevPtr = NULL;
+
+	    /*
+	     * The list of registered event handlers at fork time is in
+	     * tsdPtr->firstFileHandlerPtr;
+	     */
+	}
+    }
+
     Tcl_InitNotifier();
 }
 #endif /* HAVE_PTHREAD_ATFORK */
diff --git a/unix/tclUnixPipe.c b/unix/tclUnixPipe.c
index 9c21b28..8b26694 100644
--- a/unix/tclUnixPipe.c
+++ b/unix/tclUnixPipe.c
@@ -229,7 +229,7 @@ TclpCreateTempFile(
 Tcl_Obj *
 TclpTempFileName(void)
 {
-    Tcl_Obj *nameObj = Tcl_NewObj();
+    Tcl_Obj *retVal, *nameObj = Tcl_NewObj();
     int fd;
 
     Tcl_IncrRefCount(nameObj);
@@ -242,7 +242,9 @@ TclpTempFileName(void)
     fcntl(fd, F_SETFD, FD_CLOEXEC);
     TclpObjDeleteFile(nameObj);
     close(fd);
-    return nameObj;
+    retVal = Tcl_DuplicateObj(nameObj);
+    Tcl_DecrRefCount(nameObj);
+    return retVal;
 }
 
 /*
@@ -259,7 +261,7 @@ TclpTempFileName(void)
  *
  * On Unix, it works to load a shared object from a file of any name, so this
  * function is merely a thin wrapper around TclpTempFileName().
- *	
+ *
  *----------------------------------------------------------------------------
  */
 
@@ -967,7 +969,7 @@ PipeClose2Proc(
 	    pipePtr->outFile = NULL;
 	}
     }
-    
+
     /*
      * If half-closing, stop here.
      */
@@ -1143,7 +1145,7 @@ PipeWatchProc(
     if (psPtr->inFile) {
 	newmask = mask & (TCL_READABLE | TCL_EXCEPTION);
 	if (newmask) {
-	    Tcl_CreateFileHandler(GetFd(psPtr->inFile), mask,
+	    Tcl_CreateFileHandler(GetFd(psPtr->inFile), newmask,
 		    (Tcl_FileProc *) Tcl_NotifyChannel, psPtr->channel);
 	} else {
 	    Tcl_DeleteFileHandler(GetFd(psPtr->inFile));
@@ -1152,7 +1154,7 @@ PipeWatchProc(
     if (psPtr->outFile) {
 	newmask = mask & (TCL_WRITABLE | TCL_EXCEPTION);
 	if (newmask) {
-	    Tcl_CreateFileHandler(GetFd(psPtr->outFile), mask,
+	    Tcl_CreateFileHandler(GetFd(psPtr->outFile), newmask,
 		    (Tcl_FileProc *) Tcl_NotifyChannel, psPtr->channel);
 	} else {
 	    Tcl_DeleteFileHandler(GetFd(psPtr->outFile));
diff --git a/unix/tclUnixPort.h b/unix/tclUnixPort.h
index 2ade1c0..2728957 100644
--- a/unix/tclUnixPort.h
+++ b/unix/tclUnixPort.h
@@ -93,11 +93,11 @@ typedef off_t		Tcl_SeekOffset;
 	    WCHAR *, int);
     __declspec(dllimport) extern __stdcall void OutputDebugStringW(const WCHAR *);
     __declspec(dllimport) extern __stdcall int IsDebuggerPresent();
+    __declspec(dllimport) extern __stdcall int GetLastError();
+    __declspec(dllimport) extern __stdcall int GetFileAttributesW(const WCHAR *);
+    __declspec(dllimport) extern __stdcall int SetFileAttributesW(const WCHAR *, int);
 
     __declspec(dllimport) extern int cygwin_conv_path(int, const void *, void *, int);
-    __declspec(dllimport) extern int cygwin_conv_path_list(int, const void *, void *, int);
-#   define USE_PUTENV 1
-#   define USE_PUTENV_FOR_UNSET 1
 /* On Cygwin, the environment is imported from the Cygwin DLL. */
 #ifndef __x86_64__
 #   define environ __cygwin_environ
@@ -141,11 +141,7 @@ typedef off_t		Tcl_SeekOffset;
 #if HAVE_INTTYPES_H
 #   include <inttypes.h>
 #endif
-#ifdef NO_LIMITS_H
-#   include "../compat/limits.h"
-#else
-#   include <limits.h>
-#endif
+#include <limits.h>
 #if HAVE_STDINT_H
 #   include <stdint.h>
 #endif
@@ -447,16 +443,6 @@ extern int	gettimeofday(struct timeval *tp,
 
 /*
  *---------------------------------------------------------------------------
- * Make sure that L_tmpnam is defined.
- *---------------------------------------------------------------------------
- */
-
-#ifndef L_tmpnam
-#   define L_tmpnam	100
-#endif
-
-/*
- *---------------------------------------------------------------------------
  * The following macro defines the type of the mask arguments to select:
  *---------------------------------------------------------------------------
  */
diff --git a/unix/tclUnixSock.c b/unix/tclUnixSock.c
index a6360c2..9c5cd4b 100644
--- a/unix/tclUnixSock.c
+++ b/unix/tclUnixSock.c
@@ -55,6 +55,8 @@ struct TcpState {
     TcpFdList fds;		/* The file descriptors of the sockets. */
     int flags;			/* ORed combination of the bitfields defined
 				 * below. */
+    int interest;		/* Event types of interest */
+
     /*
      * Only needed for server sockets
      */
@@ -73,7 +75,7 @@ struct TcpState {
     struct addrinfo *myaddr;	/* Iterator over myaddrlist. */
     int filehandlers;           /* Caches FileHandlers that get set up while
                                  * an async socket is not yet connected. */
-    int status;                 /* Cache status of async socket. */
+    int connectError;           /* Cache SO_ERROR of async socket. */
     int cachedBlocking;         /* Cache blocking mode of async socket. */
 };
 
@@ -82,8 +84,13 @@ struct TcpState {
  * structure.
  */
 
-#define TCP_ASYNC_SOCKET	(1<<0)	/* Asynchronous socket. */
+#define TCP_NONBLOCKING		(1<<0)	/* Socket with non-blocking I/O */
 #define TCP_ASYNC_CONNECT	(1<<1)	/* Async connect in progress. */
+#define TCP_ASYNC_PENDING	(1<<4)	/* TcpConnect was called to
+					 * process an async connect. This
+					 * flag indicates that reentry is
+					 * still pending */
+#define TCP_ASYNC_FAILED	(1<<5)	/* An async connect finally failed */
 
 /*
  * The following defines the maximum length of the listen queue. This is the
@@ -110,7 +117,7 @@ struct TcpState {
  * Static routines for this file:
  */
 
-static int		CreateClientSocket(Tcl_Interp *interp,
+static int		TcpConnect(Tcl_Interp *interp,
                                            TcpState *state);
 static void		TcpAccept(ClientData data, int mask);
 static int		TcpBlockModeProc(ClientData data, int mode);
@@ -129,6 +136,7 @@ static int		TcpOutputProc(ClientData instanceData,
 			    const char *buf, int toWrite, int *errorCode);
 static void		TcpWatchProc(ClientData instanceData, int mask);
 static int		WaitForConnect(TcpState *statePtr, int *errorCodePtr);
+static void		WrapNotify(ClientData clientData, int mask);
 
 /*
  * This structure describes the channel type structure for TCP socket
@@ -163,6 +171,21 @@ static TclInitProcessGlobalValueProc InitializeHostName;
 static ProcessGlobalValue hostName =
 	{0, 0, NULL, NULL, InitializeHostName, NULL, NULL};
 
+#if 0
+/* printf debugging */
+void printaddrinfo(struct addrinfo *addrlist, char *prefix)
+{
+    char host[NI_MAXHOST], port[NI_MAXSERV];
+    struct addrinfo *ai;
+    for (ai = addrlist; ai != NULL; ai = ai->ai_next) {
+	getnameinfo(ai->ai_addr, ai->ai_addrlen,
+		    host, sizeof(host),
+		    port, sizeof(port),
+		    NI_NUMERICHOST|NI_NUMERICSERV);
+	fprintf(stderr,"%s: %s:%s\n", prefix, host, port);
+    }
+}
+#endif
 /*
  *----------------------------------------------------------------------
  *
@@ -349,9 +372,9 @@ TcpBlockModeProc(
     TcpState *statePtr = instanceData;
 
     if (mode == TCL_MODE_BLOCKING) {
-	CLEAR_BITS(statePtr->flags, TCP_ASYNC_SOCKET);
+	CLEAR_BITS(statePtr->flags, TCP_NONBLOCKING);
     } else {
-	SET_BITS(statePtr->flags, TCP_ASYNC_SOCKET);
+	SET_BITS(statePtr->flags, TCP_NONBLOCKING);
     }
     if (statePtr->flags & TCP_ASYNC_CONNECT) {
         statePtr->cachedBlocking = mode;
@@ -368,48 +391,80 @@ TcpBlockModeProc(
  *
  * WaitForConnect --
  *
- *	Wait for a connection on an asynchronously opened socket to be
- *	completed.  In nonblocking mode, just test if the connection
- *	has completed without blocking.
+ *	Check the state of an async connect process. If a connection
+ *	attempt terminated, process it, which may finalize it or may
+ *	start the next attempt. If a connect error occures, it is saved
+ *	in statePtr->connectError to be reported by 'fconfigure -error'.
+ *
+ *	There are two modes of operation, defined by errorCodePtr:
+ *	 *  non-NULL: Called by explicite read/write command. block if
+ *	    socket is blocking.
+ *	    May return two error codes:
+ *	     *	EWOULDBLOCK: if connect is still in progress
+ *	     *	ENOTCONN: if connect failed. This would be the error
+ *		message of a rect or sendto syscall so this is
+ *		emulated here.
+ *	 *  NULL: Called by a backround operation. Do not block and
+ *	    don't return any error code.
  *
  * Results:
  * 	0 if the connection has completed, -1 if still in progress
  * 	or there is an error.
  *
+ * Side effects:
+ *	Processes socket events off the system queue.
+ *	May process asynchroneous connect.
+ *
  *----------------------------------------------------------------------
  */
 
 static int
 WaitForConnect(
     TcpState *statePtr,		/* State of the socket. */
-    int *errorCodePtr)		/* Where to store errors? */
+    int *errorCodePtr)
 {
-    int timeOut;		/* How long to wait. */
-    int state;			/* Of calling TclWaitForFile. */
+    int timeout;
 
     /*
-     * If an asynchronous connect is in progress, attempt to wait for it to
-     * complete before reading.
+     * Check if an async connect failed already and error reporting is demanded,
+     * return the error ENOTCONN
      */
 
-    if (statePtr->flags & TCP_ASYNC_CONNECT) {
-	if (statePtr->flags & TCP_ASYNC_SOCKET) {
-	    timeOut = 0;
-	} else {
-	    timeOut = -1;
-	}
-	errno = 0;
-	state = TclUnixWaitForFile(statePtr->fds.fd,
-		TCL_WRITABLE | TCL_EXCEPTION, timeOut);
-	if (state & TCL_EXCEPTION) {
-	    return -1;
-	}
-	if (state & TCL_WRITABLE) {
-	    CLEAR_BITS(statePtr->flags, TCP_ASYNC_CONNECT);
-	} else if (timeOut == 0) {
-	    *errorCodePtr = errno = EWOULDBLOCK;
-	    return -1;
-	}
+    if (errorCodePtr != NULL && (statePtr->flags & TCP_ASYNC_FAILED)) {
+	*errorCodePtr = ENOTCONN;
+	return -1;
+    }
+
+    /*
+     * Check if an async connect is running. If not return ok
+     */
+
+    if (!(statePtr->flags & TCP_ASYNC_PENDING)) {
+	return 0;
+    }
+
+    if (errorCodePtr == NULL || (statePtr->flags & TCP_NONBLOCKING)) {
+        timeout = 0;
+    } else {
+        timeout = -1;
+    }
+    do {
+        if (TclUnixWaitForFile(statePtr->fds.fd,
+                                TCL_WRITABLE | TCL_EXCEPTION, timeout) != 0) {
+            TcpConnect(NULL, statePtr);
+        }
+        /* Do this only once in the nonblocking case and repeat it until the
+         * socket is final when blocking */
+    } while (timeout == -1 && statePtr->flags & TCP_ASYNC_CONNECT);
+
+    if (errorCodePtr != NULL) {
+        if (statePtr->flags & TCP_ASYNC_PENDING) {
+            *errorCodePtr = EAGAIN;
+            return -1;
+        } else if (statePtr->connectError != 0) {
+            *errorCodePtr = ENOTCONN;
+            return -1;
+        }
     }
     return 0;
 }
@@ -503,6 +558,7 @@ TcpOutputProc(
 	return -1;
     }
     written = send(statePtr->fds.fd, buf, (size_t) toWrite, 0);
+
     if (written > -1) {
 	return written;
     }
@@ -545,7 +601,7 @@ TcpCloseProc(
      * handlers are already deleted in the generic IO channel closing code
      * that called this function, so we do not have to delete them here.
      */
-    
+
     for (fds = &statePtr->fds; fds != NULL; fds = fds->next) {
 	if (fds->fd < 0) {
 	    continue;
@@ -554,7 +610,7 @@ TcpCloseProc(
 	if (close(fds->fd) < 0) {
 	    errorCode = errno;
 	}
-    
+
     }
     fds = statePtr->fds.next;
     while (fds != NULL) {
@@ -726,6 +782,8 @@ TcpGetOptionProc(
     TcpState *statePtr = instanceData;
     size_t len = 0;
 
+    WaitForConnect(statePtr, NULL);
+
     if (optionName != NULL) {
 	len = strlen(optionName);
     }
@@ -733,30 +791,52 @@ TcpGetOptionProc(
     if ((len > 1) && (optionName[1] == 'e') &&
 	    (strncmp(optionName, "-error", len) == 0)) {
 	socklen_t optlen = sizeof(int);
-	int err, ret;
 
-        if (statePtr->status == 0) {
-            ret = getsockopt(statePtr->fds.fd, SOL_SOCKET, SO_ERROR,
-                    (char *) &err, &optlen);
-            if (ret < 0) {
-                err = errno;
-            }
+        if (statePtr->flags & TCP_ASYNC_CONNECT) {
+            /* Suppress errors as long as we are not done */
+            errno = 0;
+        } else if (statePtr->connectError != 0) {
+            errno = statePtr->connectError;
+            statePtr->connectError = 0;
         } else {
-            err = statePtr->status;
-            statePtr->status = 0;
+            int err;
+            getsockopt(statePtr->fds.fd, SOL_SOCKET, SO_ERROR,
+                    (char *) &err, &optlen);
+            errno = err;
+        }
+        if (errno != 0) {
+	    Tcl_DStringAppend(dsPtr, Tcl_ErrnoMsg(errno), -1);
         }
-	if (err != 0) {
-	    Tcl_DStringAppend(dsPtr, Tcl_ErrnoMsg(err), -1);
-	}
 	return TCL_OK;
     }
 
+    if ((len > 1) && (optionName[1] == 'c') &&
+	    (strncmp(optionName, "-connecting", len) == 0)) {
+
+        Tcl_DStringAppend(dsPtr,
+                        (statePtr->flags & TCP_ASYNC_CONNECT) ? "1" : "0", -1);
+        return TCL_OK;
+    }
+
     if ((len == 0) || ((len > 1) && (optionName[1] == 'p') &&
 	    (strncmp(optionName, "-peername", len) == 0))) {
         address peername;
         socklen_t size = sizeof(peername);
 
-	if (getpeername(statePtr->fds.fd, &peername.sa, &size) >= 0) {
+	if ( (statePtr->flags & TCP_ASYNC_CONNECT) ) {
+	    /*
+	     * In async connect output an empty string
+	     */
+	    if (len == 0) {
+		Tcl_DStringAppendElement(dsPtr, "-peername");
+		Tcl_DStringAppendElement(dsPtr, "");
+	    } else {
+		return TCL_OK;
+	    }
+	} else if (getpeername(statePtr->fds.fd, &peername.sa, &size) >= 0) {
+	    /*
+	     * Peername fetch succeeded - output list
+	     */
 	    if (len == 0) {
 		Tcl_DStringAppendElement(dsPtr, "-peername");
 		Tcl_DStringStartSublist(dsPtr);
@@ -796,11 +876,18 @@ TcpGetOptionProc(
 	    Tcl_DStringAppendElement(dsPtr, "-sockname");
 	    Tcl_DStringStartSublist(dsPtr);
 	}
-	for (fds = &statePtr->fds; fds != NULL; fds = fds->next) {
-	    size = sizeof(sockname);
-	    if (getsockname(fds->fd, &(sockname.sa), &size) >= 0) {
-		found = 1;
-                TcpHostPortList(interp, dsPtr, sockname, size);
+	if ( (statePtr->flags & TCP_ASYNC_CONNECT) ) {
+	    /*
+	     * In async connect output an empty string
+	     */
+	     found = 1;
+	} else {
+	    for (fds = &statePtr->fds; fds != NULL; fds = fds->next) {
+		size = sizeof(sockname);
+		if (getsockname(fds->fd, &(sockname.sa), &size) >= 0) {
+		    found = 1;
+		    TcpHostPortList(interp, dsPtr, sockname, size);
+		}
 	    }
 	}
         if (found) {
@@ -818,7 +905,7 @@ TcpGetOptionProc(
     }
 
     if (len > 0) {
-	return Tcl_BadChannelOption(interp, optionName, "peername sockname");
+	return Tcl_BadChannelOption(interp, optionName, "connecting peername sockname");
     }
 
     return TCL_OK;
@@ -842,6 +929,35 @@ TcpGetOptionProc(
  */
 
 static void
+WrapNotify(
+    ClientData clientData,
+    int mask)
+{
+    TcpState *statePtr = (TcpState *) clientData;
+    int newmask = mask & statePtr->interest;
+
+    if (newmask == 0) {
+	/*
+	 * There was no overlap between the states the channel is
+	 * interested in notifications for, and the states that are
+	 * reported present on the file descriptor by select().  The
+	 * only way that can happen is when the channel is interested
+	 * in a writable condition, and only a readable state is reported
+	 * present (see TcpWatchProc() below).  In that case, signal back
+	 * to the caller the writable state, which is really an error
+	 * condition.  As an extra check on that assumption, check for
+	 * a non-zero value of errno before reporting an artificial
+	 * writable state.
+	 */
+	if (errno == 0) {
+	    return;
+	}
+	newmask = TCL_WRITABLE;
+    }
+    Tcl_NotifyChannel(statePtr->channel, newmask);
+}
+
+static void
 TcpWatchProc(
     ClientData instanceData,	/* The socket state. */
     int mask)			/* Events of interest; an OR-ed combination of
@@ -858,14 +974,36 @@ TcpWatchProc(
          */
     	return;
     }
-     
-    if (statePtr->flags & TCP_ASYNC_CONNECT) {
+
+    if (statePtr->flags & TCP_ASYNC_PENDING) {
         /* Async sockets use a FileHandler internally while connecting, so we
          * need to cache this request until the connection has succeeded. */
         statePtr->filehandlers = mask;
     } else if (mask) {
-        Tcl_CreateFileHandler(statePtr->fds.fd, mask,
-                (Tcl_FileProc *) Tcl_NotifyChannel, statePtr->channel);
+
+	/*
+	 * Whether it is a bug or feature or otherwise, it is a fact
+	 * of life that on at least some Linux kernels select() fails
+	 * to report that a socket file descriptor is writable when
+	 * the other end of the socket is closed.  This is in contrast
+	 * to the guarantees Tcl makes that its channels become
+	 * writable and fire writable events on an error conditon.
+	 * This has caused a leak of file descriptors in a state of
+	 * background flushing.  See Tcl ticket 1758a0b603.
+	 *
+	 * As a workaround, when our caller indicates an interest in
+	 * writable notifications, we must tell the notifier built
+	 * around select() that we are interested in the readable state
+	 * of the file descriptor as well, as that is the only reliable
+	 * means to get notified of error conditions.  Then it is the
+	 * task of WrapNotify() above to untangle the meaning of these
+	 * channel states and report the chan events as best it can.
+	 * We save a copy of the mask passed in to assist with that.
+	 */
+
+	statePtr->interest = mask;
+        Tcl_CreateFileHandler(statePtr->fds.fd, mask|TCL_READABLE,
+                (Tcl_FileProc *) WrapNotify, statePtr);
     } else {
         Tcl_DeleteFileHandler(statePtr->fds.fd);
     }
@@ -907,7 +1045,7 @@ TcpGetHandleProc(
  *
  * TcpAsyncCallback --
  *
- *	Called by the event handler that CreateClientSocket sets up
+ *	Called by the event handler that TcpConnect sets up
  *	internally for [socket -async] to get notified when the
  *	asyncronous connection attempt has succeeded or failed.
  *
@@ -920,13 +1058,13 @@ TcpAsyncCallback(
 				 * TCL_READABLE, TCL_WRITABLE and
 				 * TCL_EXCEPTION. */
 {
-    CreateClientSocket(NULL, clientData);
+    TcpConnect(NULL, clientData);
 }
 
 /*
  *----------------------------------------------------------------------
  *
- * CreateClientSocket --
+ * TcpConnect --
  *
  *	This function opens a new socket in client mode.
  *
@@ -954,33 +1092,32 @@ TcpAsyncCallback(
  */
 
 static int
-CreateClientSocket(
+TcpConnect(
     Tcl_Interp *interp,		/* For error reporting; can be NULL. */
-    TcpState *state)
+    TcpState *statePtr)
 {
     socklen_t optlen;
-    int async_callback = (state->addr != NULL);
-    int status;
-    int async = state->flags & TCP_ASYNC_CONNECT;
+    int async_callback = statePtr->flags & TCP_ASYNC_PENDING;
+    int ret = -1, error = errno;
+    int async = statePtr->flags & TCP_ASYNC_CONNECT;
 
     if (async_callback) {
         goto reenter;
     }
 
-    for (state->addr = state->addrlist; state->addr != NULL;
-            state->addr = state->addr->ai_next) {
-	status = -1;
+    for (statePtr->addr = statePtr->addrlist; statePtr->addr != NULL;
+            statePtr->addr = statePtr->addr->ai_next) {
+
+        for (statePtr->myaddr = statePtr->myaddrlist; statePtr->myaddr != NULL;
+                statePtr->myaddr = statePtr->myaddr->ai_next) {
+            int reuseaddr = 1;
 
-        for (state->myaddr = state->myaddrlist; state->myaddr != NULL;
-                state->myaddr = state->myaddr->ai_next) {
-            int reuseaddr;
-            
 	    /*
 	     * No need to try combinations of local and remote addresses of
 	     * different families.
 	     */
 
-	    if (state->myaddr->ai_family != state->addr->ai_family) {
+	    if (statePtr->myaddr->ai_family != statePtr->addr->ai_family) {
 		continue;
 	    }
 
@@ -989,13 +1126,14 @@ CreateClientSocket(
              * iteration.
              */
 
-            if (state->fds.fd >= 0) {
-		close(state->fds.fd);
-		state->fds.fd = -1;
+            if (statePtr->fds.fd >= 0) {
+		close(statePtr->fds.fd);
+		statePtr->fds.fd = -1;
+                errno = 0;
 	    }
 
-	    state->fds.fd = socket(state->addr->ai_family, SOCK_STREAM, 0);
-	    if (state->fds.fd < 0) {
+	    statePtr->fds.fd = socket(statePtr->addr->ai_family, SOCK_STREAM, 0);
+	    if (statePtr->fds.fd < 0) {
 		continue;
 	    }
 
@@ -1003,29 +1141,32 @@ CreateClientSocket(
 	     * Set the close-on-exec flag so that the socket will not get
 	     * inherited by child processes.
 	     */
-	    
-	    fcntl(state->fds.fd, F_SETFD, FD_CLOEXEC);
-	    
+
+	    fcntl(statePtr->fds.fd, F_SETFD, FD_CLOEXEC);
+
 	    /*
 	     * Set kernel space buffering
 	     */
-	    
-	    TclSockMinimumBuffers(INT2PTR(state->fds.fd), SOCKET_BUFSIZE);
-    
+
+	    TclSockMinimumBuffers(INT2PTR(statePtr->fds.fd), SOCKET_BUFSIZE);
+
 	    if (async) {
-		status = TclUnixSetBlockingMode(state->fds.fd,
-                        TCL_MODE_NONBLOCKING);
-		if (status < 0) {
+                ret = TclUnixSetBlockingMode(statePtr->fds.fd,TCL_MODE_NONBLOCKING);
+                if (ret < 0) {
                     continue;
-		}
-	    }
+                }
+            }
+
+            /* Gotta reset the error variable here, before we use it for the
+             * first time in this iteration. */
+            error = 0;
 
-            reuseaddr = 1;
-            (void) setsockopt(state->fds.fd, SOL_SOCKET, SO_REUSEADDR,
+            (void) setsockopt(statePtr->fds.fd, SOL_SOCKET, SO_REUSEADDR,
                     (char *) &reuseaddr, sizeof(reuseaddr));
-            status = bind(state->fds.fd, state->myaddr->ai_addr,
-                    state->myaddr->ai_addrlen);
-            if (status < 0) {
+            ret = bind(statePtr->fds.fd, statePtr->myaddr->ai_addr,
+                    statePtr->myaddr->ai_addrlen);
+            if (ret < 0) {
+                error = errno;
                 continue;
             }
 
@@ -1035,16 +1176,20 @@ CreateClientSocket(
 	     * will set up a file handler on the socket if she is interested
 	     * in being informed when the connect completes.
 	     */
-	    
-	    status = connect(state->fds.fd, state->addr->ai_addr,
-                    state->addr->ai_addrlen);
-	    if (status < 0 && errno == EINPROGRESS) {
-                Tcl_CreateFileHandler(state->fds.fd,
-                        TCL_WRITABLE|TCL_EXCEPTION, TcpAsyncCallback, state);
+
+	    ret = connect(statePtr->fds.fd, statePtr->addr->ai_addr,
+                        statePtr->addr->ai_addrlen);
+            if (ret < 0) error = errno;
+	    if (ret < 0 && errno == EINPROGRESS) {
+                Tcl_CreateFileHandler(statePtr->fds.fd,
+                        TCL_WRITABLE|TCL_EXCEPTION, TcpAsyncCallback, statePtr);
+                errno = EWOULDBLOCK;
+                SET_BITS(statePtr->flags, TCP_ASYNC_PENDING);
                 return TCL_OK;
 
             reenter:
-                Tcl_DeleteFileHandler(state->fds.fd);
+                CLEAR_BITS(statePtr->flags, TCP_ASYNC_PENDING);
+                Tcl_DeleteFileHandler(statePtr->fds.fd);
 
                 /*
                  * Read the error state from the socket to see if the async
@@ -1054,26 +1199,31 @@ CreateClientSocket(
                  */
 
                 optlen = sizeof(int);
-                getsockopt(state->fds.fd, SOL_SOCKET, SO_ERROR,
-                        (char *) &status, &optlen);
-                state->status = status;
+
+                getsockopt(statePtr->fds.fd, SOL_SOCKET, SO_ERROR,
+                        (char *) &error, &optlen);
+                errno = error;
             }
-	    if (status == 0) {
-		CLEAR_BITS(state->flags, TCP_ASYNC_CONNECT);
+	    if (error == 0) {
 		goto out;
 	    }
 	}
     }
 
 out:
-
+    statePtr->connectError = error;
+    CLEAR_BITS(statePtr->flags, TCP_ASYNC_CONNECT);
     if (async_callback) {
         /*
          * An asynchonous connection has finally succeeded or failed.
          */
 
-        TcpWatchProc(state, state->filehandlers);
-        TclUnixSetBlockingMode(state->fds.fd, state->cachedBlocking);
+        TcpWatchProc(statePtr, statePtr->filehandlers);
+        TclUnixSetBlockingMode(statePtr->fds.fd, statePtr->cachedBlocking);
+
+        if (error != 0) {
+            SET_BITS(statePtr->flags, TCP_ASYNC_FAILED);
+        }
 
         /*
          * We need to forward the writable event that brought us here, bcasue
@@ -1084,8 +1234,11 @@ out:
          * the event mechanism one roundtrip through select().
          */
 
-        Tcl_NotifyChannel(state->channel, TCL_WRITABLE);
-    } else if (status != 0) {
+	if (statePtr->cachedBlocking == TCL_MODE_NONBLOCKING) {
+	    Tcl_NotifyChannel(statePtr->channel, TCL_WRITABLE);
+	}
+    }
+    if (error != 0) {
         /*
          * Failure for either a synchronous connection, or an async one that
          * failed before it could enter background mode, e.g. because an
@@ -1093,6 +1246,7 @@ out:
          */
 
         if (interp != NULL) {
+            errno = error;
             Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                     "couldn't open socket: %s", Tcl_PosixError(interp)));
         }
@@ -1129,9 +1283,9 @@ Tcl_OpenTcpClient(
 				 * connect. Otherwise we do a blocking
 				 * connect. */
 {
-    TcpState *state;
+    TcpState *statePtr;
     const char *errorMsg = NULL;
-    void *addrlist = NULL, *myaddrlist = NULL;
+    struct addrinfo *addrlist = NULL, *myaddrlist = NULL;
     char channelName[SOCK_CHAN_LENGTH];
 
     /*
@@ -1154,32 +1308,32 @@ Tcl_OpenTcpClient(
     /*
      * Allocate a new TcpState for this socket.
      */
-    state = ckalloc(sizeof(TcpState));
-    memset(state, 0, sizeof(TcpState));
-    state->flags = async ? TCP_ASYNC_CONNECT : 0;
-    state->cachedBlocking = TCL_MODE_BLOCKING;
-    state->addrlist = addrlist;
-    state->myaddrlist = myaddrlist;
-    state->fds.fd = -1;
+    statePtr = ckalloc(sizeof(TcpState));
+    memset(statePtr, 0, sizeof(TcpState));
+    statePtr->flags = async ? TCP_ASYNC_CONNECT : 0;
+    statePtr->cachedBlocking = TCL_MODE_BLOCKING;
+    statePtr->addrlist = addrlist;
+    statePtr->myaddrlist = myaddrlist;
+    statePtr->fds.fd = -1;
 
     /*
      * Create a new client socket and wrap it in a channel.
      */
-    if (CreateClientSocket(interp, state) != TCL_OK) {
-        TcpCloseProc(state, NULL);
+    if (TcpConnect(interp, statePtr) != TCL_OK) {
+        TcpCloseProc(statePtr, NULL);
         return NULL;
     }
 
-    sprintf(channelName, SOCK_TEMPLATE, (long) state);
+    sprintf(channelName, SOCK_TEMPLATE, (long) statePtr);
 
-    state->channel = Tcl_CreateChannel(&tcpChannelType, channelName, state,
+    statePtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName, statePtr,
             (TCL_READABLE | TCL_WRITABLE));
-    if (Tcl_SetChannelOption(interp, state->channel, "-translation",
+    if (Tcl_SetChannelOption(interp, statePtr->channel, "-translation",
 	    "auto crlf") == TCL_ERROR) {
-	Tcl_Close(NULL, state->channel);
+	Tcl_Close(NULL, statePtr->channel);
 	return NULL;
     }
-    return state->channel;
+    return statePtr->channel;
 }
 
 /*
@@ -1276,8 +1430,7 @@ Tcl_OpenTcpServer(
     ClientData acceptProcData)	/* Data for the callback. */
 {
     int status = 0, sock = -1, reuseaddr = 1, chosenport = 0;
-    void *addrlist = NULL;
-    struct addrinfo *addrPtr;	/* socket address */
+    struct addrinfo *addrlist = NULL, *addrPtr;	/* socket address */
     TcpState *statePtr = NULL;
     char channelName[SOCK_CHAN_LENGTH];
     const char *errorMsg = NULL;
@@ -1306,28 +1459,28 @@ Tcl_OpenTcpServer(
 	    }
 	    continue;
 	}
-	
+
 	/*
 	 * Set the close-on-exec flag so that the socket will not get
 	 * inherited by child processes.
 	 */
-	
+
 	fcntl(sock, F_SETFD, FD_CLOEXEC);
-	
+
 	/*
 	 * Set kernel space buffering
 	 */
-	
+
 	TclSockMinimumBuffers(INT2PTR(sock), SOCKET_BUFSIZE);
-	
+
 	/*
 	 * Set up to reuse server addresses automatically and bind to the
 	 * specified port.
 	 */
-	
-	(void) setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, 
+
+	(void) setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 		(char *) &reuseaddr, sizeof(reuseaddr));
-	
+
         /*
          * Make sure we use the same port number when opening two server
          * sockets for IPv4 and IPv6 on a random port.
@@ -1356,7 +1509,7 @@ Tcl_OpenTcpServer(
 	    if (howfar < BIND) {
 		howfar = BIND;
 		my_errno = errno;
-	    }       
+	    }
             close(sock);
             sock = -1;
             continue;
@@ -1388,7 +1541,7 @@ Tcl_OpenTcpServer(
             /*
              * Allocate a new TcpState for this socket.
              */
-            
+
             statePtr = ckalloc(sizeof(TcpState));
             memset(statePtr, 0, sizeof(TcpState));
             statePtr->acceptProc = acceptProc;
@@ -1403,12 +1556,12 @@ Tcl_OpenTcpServer(
         newfds->fd = sock;
         newfds->statePtr = statePtr;
         fds = newfds;
-	
+
         /*
          * Set up the callback mechanism for accepting connections from new
          * clients.
          */
-        
+
         Tcl_CreateFileHandler(sock, TCL_READABLE, TcpAccept, fds);
     }
 
@@ -1467,7 +1620,7 @@ TcpAccept(
     socklen_t len;		/* For accept interface */
     char channelName[SOCK_CHAN_LENGTH];
     char host[NI_MAXHOST], port[NI_MAXSERV];
-    
+
     len = sizeof(addr);
     newsock = accept(fds->fd, &addr.sa, &len);
     if (newsock < 0) {
diff --git a/unix/tclUnixTest.c b/unix/tclUnixTest.c
index 4b0f369..c5ac52a 100644
--- a/unix/tclUnixTest.c
+++ b/unix/tclUnixTest.c
@@ -63,7 +63,7 @@ static const char *gotsig = "0";
  */
 
 static Tcl_CmdProc TestalarmCmd;
-static Tcl_CmdProc TestchmodCmd;
+static Tcl_ObjCmdProc TestchmodCmd;
 static Tcl_CmdProc TestfilehandlerCmd;
 static Tcl_CmdProc TestfilewaitCmd;
 static Tcl_CmdProc TestfindexecutableCmd;
@@ -96,7 +96,7 @@ int
 TclplatformtestInit(
     Tcl_Interp *interp)		/* Interpreter to add commands to. */
 {
-    Tcl_CreateCommand(interp, "testchmod", TestchmodCmd,
+    Tcl_CreateObjCommand(interp, "testchmod", TestchmodCmd,
 	    NULL, NULL);
     Tcl_CreateCommand(interp, "testfilehandler", TestfilehandlerCmd,
 	    NULL, NULL);
@@ -740,29 +740,25 @@ static int
 TestchmodCmd(
     ClientData dummy,			/* Not used. */
     Tcl_Interp *interp,			/* Current interpreter. */
-    int argc,				/* Number of arguments. */
-    const char **argv)			/* Argument strings. */
+    int objc,			/* Number of arguments. */
+    Tcl_Obj *const *objv)		/* Argument strings. */
 {
     int i, mode;
-    char *rest;
 
-    if (argc < 2) {
-    usage:
-	Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
-		" mode file ?file ...?", NULL);
+    if (objc < 2) {
+    Tcl_WrongNumArgs(interp, 1, objv, "mode file ?file ...?");
 	return TCL_ERROR;
     }
 
-    mode = (int) strtol(argv[1], &rest, 8);
-    if ((rest == argv[1]) || (*rest != '\0')) {
-	goto usage;
+    if (Tcl_GetIntFromObj(interp, objv[1], &mode) != TCL_OK) {
+	return TCL_ERROR;
     }
 
-    for (i = 2; i < argc; i++) {
+    for (i = 2; i < objc; i++) {
 	Tcl_DString buffer;
 	const char *translated;
 
-	translated = Tcl_TranslateFileName(interp, argv[i], &buffer);
+	translated = Tcl_TranslateFileName(interp, Tcl_GetString(objv[i]), &buffer);
 	if (translated == NULL) {
 	    return TCL_ERROR;
 	}
diff --git a/unix/tclUnixThrd.c b/unix/tclUnixThrd.c
index f469341..ae81c5f 100644
--- a/unix/tclUnixThrd.c
+++ b/unix/tclUnixThrd.c
@@ -22,6 +22,19 @@ typedef struct ThreadSpecificData {
 static Tcl_ThreadDataKey dataKey;
 
 /*
+ * This is the number of milliseconds to wait between internal retries in
+ * the Tcl_MutexLock function.  This value must be greater than zero and
+ * should be a suitable value for the given platform.
+ *
+ * TODO: This may need to be dynamically determined, based on the relative
+ *       performance of the running process.
+ */
+
+#ifndef TCL_MUTEX_LOCK_SLEEP_TIME
+#  define TCL_MUTEX_LOCK_SLEEP_TIME	(25)
+#endif
+
+/*
  * masterLock is used to serialize creation of mutexes, condition variables,
  * and thread local storage. This is the only place that can count on the
  * ability to statically initialize the mutex.
@@ -45,6 +58,13 @@ static pthread_mutex_t allocLock = PTHREAD_MUTEX_INITIALIZER;
 static pthread_mutex_t *allocLockPtr = &allocLock;
 
 /*
+ * The mutexLock serializes Tcl_MutexLock. This is necessary to prevent
+ * races when finalizing a mutex that some other thread may want to lock.
+ */
+
+static pthread_mutex_t mutexLock = PTHREAD_MUTEX_INITIALIZER;
+
+/*
  * These are for the critical sections inside this file.
  */
 
@@ -421,6 +441,8 @@ Tcl_MutexLock(
 {
     pthread_mutex_t *pmutexPtr;
 
+retry:
+
     if (*mutexPtr == NULL) {
 	MASTER_LOCK;
 	if (*mutexPtr == NULL) {
@@ -435,8 +457,32 @@ Tcl_MutexLock(
 	}
 	MASTER_UNLOCK;
     }
-    pmutexPtr = *((pthread_mutex_t **)mutexPtr);
-    pthread_mutex_lock(pmutexPtr);
+    while (1) {
+	pthread_mutex_lock(&mutexLock);
+	pmutexPtr = *((pthread_mutex_t **)mutexPtr);
+	if (pmutexPtr == NULL) {
+	    pthread_mutex_unlock(&mutexLock);
+	    goto retry;
+	}
+	if (pthread_mutex_trylock(pmutexPtr) == 0) {
+	    pthread_mutex_unlock(&mutexLock);
+	    return;
+	}
+	pthread_mutex_unlock(&mutexLock);
+	/*
+	 * BUGBUG: All core and Thread package tests pass when usleep()
+	 *         is used; however, the Thread package tests hang at
+	 *         various places when Tcl_Sleep() is used, typically
+	 *         while running test "thread-17.8", "thread-17.9", or
+	 *         "thread-17.11a".  Really, what we want here is just
+	 *         to yield to other threads for a while.
+	 */
+#ifdef HAVE_USLEEP
+	usleep(TCL_MUTEX_LOCK_SLEEP_TIME * 1000);
+#else
+	Tcl_Sleep(TCL_MUTEX_LOCK_SLEEP_TIME);
+#endif
+    }
 }
 
 /*
@@ -727,6 +773,7 @@ TclpFreeAllocCache(
 	 */
 
 	TclFreeAllocCache(ptr);
+	pthread_setspecific(key, NULL);
 
     } else if (initialized) {
 	/*
diff --git a/unix/tclUnixThrd.h b/unix/tclUnixThrd.h
index 6a73132..f03b530 100644
--- a/unix/tclUnixThrd.h
+++ b/unix/tclUnixThrd.h
@@ -8,7 +8,7 @@
  * See the file "license.terms" for information on usage and redistribution
  * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
  */
- 
+
 #ifndef _TCLUNIXTHRD
 #define _TCLUNIXTHRD
 
diff --git a/unix/tclUnixTime.c b/unix/tclUnixTime.c
index 926e8f4..315bcf9 100644
--- a/unix/tclUnixTime.c
+++ b/unix/tclUnixTime.c
@@ -16,9 +16,6 @@
 #include <mach/mach_time.h>
 #endif
 
-#define TM_YEAR_BASE 1900
-#define IsLeapYear(x)	(((x)%4 == 0) && ((x)%100 != 0 || (x)%400 == 0))
-
 /*
  * TclpGetDate is coded to return a pointer to a 'struct tm'. For thread
  * safety, this structure must be in thread-specific data. The 'tmKey'
@@ -202,7 +199,7 @@ TclpWideClicksToNanoseconds(
 #ifdef MAC_OSX_TCL
 	static mach_timebase_info_data_t tb;
 	static uint64_t maxClicksForUInt64;
-	
+
 	if (!tb.denom) {
 	    mach_timebase_info(&tb);
 	    maxClicksForUInt64 = UINT64_MAX / tb.numer;
diff --git a/unix/tclXtTest.c b/unix/tclXtTest.c
index fcb0773..f7c2652 100644
--- a/unix/tclXtTest.c
+++ b/unix/tclXtTest.c
@@ -15,7 +15,7 @@
 #include <X11/Intrinsic.h>
 #include "tcl.h"
 
-static Tcl_CmdProc TesteventloopCmd;
+static Tcl_ObjCmdProc TesteventloopCmd;
 extern DLLEXPORT Tcl_PackageInitProc Tclxttest_Init;
 
 /*
@@ -53,7 +53,7 @@ Tclxttest_Init(
     }
     XtToolkitInitialize();
     InitNotifier();
-    Tcl_CreateCommand(interp, "testeventloop", TesteventloopCmd,
+    Tcl_CreateObjCommand(interp, "testeventloop", TesteventloopCmd,
 	    NULL, NULL);
     return TCL_OK;
 }
@@ -80,21 +80,20 @@ static int
 TesteventloopCmd(
     ClientData clientData,	/* Not used. */
     Tcl_Interp *interp,		/* Current interpreter. */
-    int argc,			/* Number of arguments. */
-    const char **argv)		/* Argument strings. */
+    int objc,			/* Number of arguments. */
+    Tcl_Obj *const objv[])	/* Argument objects. */
 {
     static int *framePtr = NULL;/* Pointer to integer on stack frame of
 				 * innermost invocation of the "wait"
 				 * subcommand. */
 
-    if (argc < 2) {
-	Tcl_AppendResult(interp, "wrong # arguments: should be \"", argv[0],
-		" option ... \"", NULL);
+    if (objc < 2) {
+	Tcl_WrongNumArgs(interp, 1, objv, "option ...");
 	return TCL_ERROR;
     }
-    if (strcmp(argv[1], "done") == 0) {
+    if (strcmp(Tcl_GetString(objv[1]), "done") == 0) {
 	*framePtr = 1;
-    } else if (strcmp(argv[1], "wait") == 0) {
+    } else if (strcmp(Tcl_GetString(objv[1]), "wait") == 0) {
 	int *oldFramePtr;
 	int done;
 	int oldMode = Tcl_SetServiceMode(TCL_SERVICE_ALL);
@@ -118,7 +117,7 @@ TesteventloopCmd(
 	(void) Tcl_SetServiceMode(oldMode);
 	framePtr = oldFramePtr;
     } else {
-	Tcl_AppendResult(interp, "bad option \"", argv[1],
+	Tcl_AppendResult(interp, "bad option \"", Tcl_GetString(objv[1]),
 		"\": must be done or wait", NULL);
 	return TCL_ERROR;
     }
diff --git a/unix/tclooConfig.sh b/unix/tclooConfig.sh
index 08cc4c5..55fe75f 100644
--- a/unix/tclooConfig.sh
+++ b/unix/tclooConfig.sh
@@ -16,4 +16,4 @@ TCLOO_STUB_LIB_SPEC=""
 TCLOO_INCLUDE_SPEC=""
 TCLOO_PRIVATE_INCLUDE_SPEC=""
 TCLOO_CFLAGS=""
-TCLOO_VERSION=1.0.1
+TCLOO_VERSION=1.0.3