From f1db56fcd77e3479f8bea9047b83b3757a805567 Mon Sep 17 00:00:00 2001
From: Martin Kroeker <martin@ruby.chemie.uni-freiburg.de>
Date: Sun, 8 Jan 2017 23:05:55 +0100
Subject: [PATCH] Replace sched_yield with usleep(1) on Linux

to avoid the massive overhead of the sched_yield call on Linux kernels since its semantics were changed in early 2003 (late 2.5 series) to include reordering of the thread queue. Ref. #900,#923
---
 common.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/common.h b/common.h
index 480174c11..e728b9ef3 100644
--- a/common.h
+++ b/common.h
@@ -313,6 +313,10 @@ typedef int blasint;
 #if defined(OS_SUNOS)
 #define YIELDING	thr_yield()
 #endif
+	
+#if defined(OS_LINUX)
+#define YIELDING	usleep(1)
+#endif
 
 #if defined(OS_WINDOWS)
 #if defined(_MSC_VER) && !defined(__clang__)