From c324c3a9e7558e87ec628d45d3d0577d614ee350 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Fri, 22 Mar 2013 21:41:45 -0400
Subject: Use spinlock for futures when possible.

---
 configure.ac | 34 +++++++++++++++++++++++++++++++++-
 1 file changed, 33 insertions(+), 1 deletion(-)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 1141ac8..8faf2bb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-dnl Copyright (C) 2009-2012 Tavian Barnes <tavianator@tavianator.com>
+dnl Copyright (C) 2009-2013 Tavian Barnes <tavianator@tavianator.com>
 dnl
 dnl This file is part of The Dimension Build Suite.
 dnl
@@ -231,6 +231,38 @@ AC_COMPILE_IFELSE([
    AC_MSG_RESULT([no])]
 )
 
+save_CFLAGS="$CFLAGS"
+save_LIBS="$LIBS"
+CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
+LIBS="$LIBS $PTHREAD_LIBS"
+AC_MSG_CHECKING([for pthread_spinlock_t])
+AC_RUN_IFELSE([
+  AC_LANG_PROGRAM(
+    [
+      #include <pthread.h>
+      #include <stdlib.h>
+    ],
+    [
+      pthread_spinlock_t spinlock;
+      if (pthread_spin_init(&spinlock, PTHREAD_PROCESS_PRIVATE) != 0) {
+        return EXIT_FAILURE;
+      }
+      if (pthread_spin_lock(&spinlock) != 0) {
+        return EXIT_FAILURE;
+      }
+      if (pthread_spin_unlock(&spinlock) != 0) {
+        return EXIT_FAILURE;
+      }
+    ]
+  )],
+  [AC_DEFINE([DMNSN_SPINLOCK], [1])
+   AC_MSG_RESULT([yes])],
+  [AC_DEFINE([DMNSN_SPINLOCK], [0])
+   AC_MSG_RESULT([no])]
+)
+CFLAGS="$save_CFLAGS"
+LIBS="$save_LIBS"
+
 AC_CHECK_HEADER([GL/glx.h], [have_glx=yes], [have_glx=no])
 if test "$enable_gl" = "yes" -a "$have_glx" = "yes"; then
   AC_CHECK_LIB([X11], [XOpenDisplay], [], [have_glx=no])
-- 
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