From 8c0a7dab9b12dda93f76637c8e32316148890b88 Mon Sep 17 00:00:00 2001
From: Joe Mistachkin <joe@mistachkin.com>
Date: Mon, 18 May 2015 20:33:56 +0000
Subject: First attempt at implementing the necessary auto-magic for usleep.

---
 unix/configure.in  |  6 ++++++
 unix/tcl.m4        | 42 ++++++++++++++++++++++++++++++++++++++++++
 unix/tclUnixThrd.c |  8 --------
 3 files changed, 48 insertions(+), 8 deletions(-)

diff --git a/unix/configure.in b/unix/configure.in
index c7b0edc..ce68391 100644
--- a/unix/configure.in
+++ b/unix/configure.in
@@ -545,6 +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/tcl.m4 b/unix/tcl.m4
index 25c2699..3ffdcd4 100644
--- a/unix/tcl.m4
+++ b/unix/tcl.m4
@@ -774,6 +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.
diff --git a/unix/tclUnixThrd.c b/unix/tclUnixThrd.c
index 2cb2d87..3963f84 100644
--- a/unix/tclUnixThrd.c
+++ b/unix/tclUnixThrd.c
@@ -35,14 +35,6 @@ static Tcl_ThreadDataKey dataKey;
 #endif
 
 /*
- * TODO: Remove this section and add the necessary "auto* magic".
- */
-
-#ifndef HAVE_USLEEP
-#  define HAVE_USLEEP
-#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.
-- 
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