From 6a99fcce94ac0ff76bcdc502197fb8e0cd1c97c6 Mon Sep 17 00:00:00 2001
From: Martin Kroeker <martin@ruby.chemie.uni-freiburg.de>
Date: Sat, 10 Mar 2018 00:03:49 +0100
Subject: [PATCH] Use _Atomic instead of volatile for thread safety where C11
 is supported

Suggested by dodomorandi in #660
---
 driver/level3/level3_gemm3m_thread.c | 7 ++++++-
 driver/level3/level3_syrk_threaded.c | 7 ++++++-
 driver/level3/level3_thread.c        | 7 ++++++-
 3 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/driver/level3/level3_gemm3m_thread.c b/driver/level3/level3_gemm3m_thread.c
index bfd991ffb..f5e5bca1e 100644
--- a/driver/level3/level3_gemm3m_thread.c
+++ b/driver/level3/level3_gemm3m_thread.c
@@ -91,7 +91,12 @@
 #endif
 
 typedef struct {
-  volatile BLASLONG working[MAX_CPU_NUMBER][CACHE_LINE_SIZE * DIVIDE_RATE];
+#if _STDC_VERSION__ >= 201112L  
+  _Atomic
+#else
+  volatile
+#endif  
+   BLASLONG working[MAX_CPU_NUMBER][CACHE_LINE_SIZE * DIVIDE_RATE];
 } job_t;
 
 
diff --git a/driver/level3/level3_syrk_threaded.c b/driver/level3/level3_syrk_threaded.c
index 65002ae46..d1c476f00 100644
--- a/driver/level3/level3_syrk_threaded.c
+++ b/driver/level3/level3_syrk_threaded.c
@@ -67,7 +67,12 @@
 #endif
 
 typedef struct {
-  volatile BLASLONG working[MAX_CPU_NUMBER][CACHE_LINE_SIZE * DIVIDE_RATE];
+#if _STDC_VERSION__ >= 201112L  
+_Atomic
+#else 
+  volatile
+#endif
+   BLASLONG working[MAX_CPU_NUMBER][CACHE_LINE_SIZE * DIVIDE_RATE];
 } job_t;
 
 
diff --git a/driver/level3/level3_thread.c b/driver/level3/level3_thread.c
index a1ed8bbb1..47b20f7fa 100644
--- a/driver/level3/level3_thread.c
+++ b/driver/level3/level3_thread.c
@@ -91,7 +91,12 @@
 #endif
 
 typedef struct {
-  volatile BLASLONG working[MAX_CPU_NUMBER][CACHE_LINE_SIZE * DIVIDE_RATE];
+#if _STDC_VERSION__ >= 201112L
+_Atomic
+#else  
+  volatile
+#endif
+   BLASLONG working[MAX_CPU_NUMBER][CACHE_LINE_SIZE * DIVIDE_RATE];
 } job_t;