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-rw-r--r--unix/tcl.m442
1 files changed, 42 insertions, 0 deletions
diff --git a/unix/tcl.m4 b/unix/tcl.m4
index 67c442c..d896d05 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.