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[Qemu-devel] [PATCH v2 07/13] qemu-thread: call cpu_relax() while spinni


From: Emilio G. Cota
Subject: [Qemu-devel] [PATCH v2 07/13] qemu-thread: call cpu_relax() while spinning
Date: Thu, 7 Apr 2016 13:32:32 -0400

Signed-off-by: Emilio G. Cota <address@hidden>
---
 include/qemu/thread.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/qemu/thread.h b/include/qemu/thread.h
index 1aa843b..599965e 100644
--- a/include/qemu/thread.h
+++ b/include/qemu/thread.h
@@ -2,6 +2,7 @@
 #define __QEMU_THREAD_H 1
 
 #include <errno.h>
+#include "qemu/processor.h"
 #include "qemu/atomic.h"
 
 typedef struct QemuMutex QemuMutex;
@@ -74,7 +75,9 @@ static inline void qemu_spin_init(QemuSpin *spin)
 static inline void qemu_spin_lock(QemuSpin *spin)
 {
     do {
-        while (atomic_read(&spin->value));
+        while (atomic_read(&spin->value)) {
+            cpu_relax();
+        }
     } while (atomic_xchg(&spin->value, true));
 }
 
-- 
2.5.0




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