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authorUlrich Drepper <drepper@redhat.com>2002-03-22 08:29:10 +0000
committerUlrich Drepper <drepper@redhat.com>2002-03-22 08:29:10 +0000
commit32fe4a9320702ca48a812e60800bd3ec6f21418c (patch)
tree8a15d27c76209731af1e68c2501f2435a7b19a06 /linuxthreads/internals.h
parentc7a9b6e2d3f2257ecd6fe1da6f4c0dfdd5521b29 (diff)
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Update.
2002-03-22  Ulrich Drepper  <drepper@redhat.com>

	* internals.h (MEMORY_BARRIER): Define as asm with memory as clobber.
Diffstat (limited to 'linuxthreads/internals.h')
-rw-r--r--linuxthreads/internals.h10
1 files changed, 6 insertions, 4 deletions
diff --git a/linuxthreads/internals.h b/linuxthreads/internals.h
index 8fef62f7bd..45a73ad194 100644
--- a/linuxthreads/internals.h
+++ b/linuxthreads/internals.h
@@ -193,12 +193,14 @@ static inline int nonexisting_handle(pthread_handle h, pthread_t id)
 #define THREAD_STACK_START_ADDRESS  __pthread_initial_thread_bos
 #endif
 
-/* If MEMORY_BARRIER isn't defined in pt-machine.h, assume the architecture
-   doesn't need a memory barrier instruction (e.g. Intel x86).  Some
-   architectures distinguish between full, read and write barriers.  */
+/* If MEMORY_BARRIER isn't defined in pt-machine.h, assume the
+   architecture doesn't need a memory barrier instruction (e.g. Intel
+   x86).  Still we need the compiler to respect the barrier and emit
+   all outstanding operations which modify memory.  Some architectures
+   distinguish between full, read and write barriers.  */
 
 #ifndef MEMORY_BARRIER
-#define MEMORY_BARRIER()
+#define MEMORY_BARRIER() asm ("" : : : "memory")
 #endif
 #ifndef READ_MEMORY_BARRIER
 #define READ_MEMORY_BARRIER() MEMORY_BARRIER()