New module 'yield'.

[gnulib.git] / m4 / yield.m4

diff --git a/m4/yield.m4 b/m4/yield.m4
new file mode 100644 (file)
index 0000000..8701a86
--- /dev/null
+++ b/m4/yield.m4
@@ -0,0 +1,19 @@
+# yield.m4 serial 1
+dnl Copyright (C) 2005-2008 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_YIELD],
+[
+  AC_REQUIRE([gl_THREADLIB])
+  dnl On some systems, sched_yield is in librt, rather than in libpthread.
+  YIELD_LIB=
+  if test $gl_threads_api = posix; then
+    dnl Solaris has sched_yield in librt, not in libpthread or libc.
+    AC_CHECK_LIB(rt, sched_yield, [YIELD_LIB=-lrt],
+      [dnl Solaris 2.5.1, 2.6 has sched_yield in libposix4, not librt.
+       AC_CHECK_LIB(posix4, sched_yield, [YIELD_LIB=-lposix4])])
+  fi
+  AC_SUBST([YIELD_LIB])
+])