[PATCH:intel-gpu-tools 3/6] Use sched_yield if pthread_yield is not available

[Alan Coopersmith]

Despite the name implying it's a standard part of the POSIX threads API,
pthread_yield is actually non-standard and not entirely portable.  For
systems like Solaris that don't have it, fall back to sched_yield.

Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>
---
 configure.ac             |    1 +
 tests/gem_fence_thrash.c |    6 ++++++
 2 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/configure.ac b/configure.ac
index 197c622..5fe993c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -35,6 +35,7 @@ AM_INIT_AUTOMAKE([foreign dist-bzip2])
 AM_MAINTAINER_MODE
 
 # Checks for functions, headers, structures, etc.
+AC_CHECK_FUNCS([pthread_yield])
 AC_CHECK_HEADERS([termios.h])
 AC_CHECK_MEMBERS([struct sysinfo.totalram],[],[],[AC_INCLUDES_DEFAULT
 #include <sys/sysinfo.h>
diff --git a/tests/gem_fence_thrash.c b/tests/gem_fence_thrash.c
index 8ed4e08..22c1e4b 100644
--- a/tests/gem_fence_thrash.c
+++ b/tests/gem_fence_thrash.c
@@ -26,6 +26,8 @@
  *
  */
 
+#include "config.h"
+
 #define _GNU_SOURCE
 
 #include <unistd.h>
@@ -110,7 +112,11 @@ bo_copy (void *_arg)
 
 	for (n = 0; n < 1000; n++) {
 		memcpy (a, b, OBJECT_SIZE);
+#ifdef HAVE_PTHREAD_YIELD
 		pthread_yield ();
+#else
+		sched_yield ();
+#endif
 	}
 
 	return NULL;
-- 
1.7.3.2