[Spice-devel] [PATCH 07/12] server: use gcc builtin for atomic get/set bit

[Christophe Fergeau]

---
 server/red_worker.h |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/server/red_worker.h b/server/red_worker.h
index ae2eaee..b4e2ed2 100644
--- a/server/red_worker.h
+++ b/server/red_worker.h
@@ -23,12 +23,14 @@
 
 static inline void set_bit(int index, uint32_t *addr)
 {
-    __asm__ __volatile__ ("lock btsl %1, %0": : "m" (*addr), "r" (index));
+    uint32_t mask = 1 << index;
+    __sync_or_and_fetch(addr, mask);
 }
 
 static inline void clear_bit(int index, uint32_t *addr)
 {
-    __asm__ __volatile__ ("lock btrl %1, %0": : "m" (*addr), "r" (index));
+    uint32_t mask = ~(1 << index);
+    __sync_and_and_fetch(addr, mask);
 }
 
 static inline int test_bit(int index, uint32_t val)
-- 
1.7.4.4

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