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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
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')
-rw-r--r--linuxthreads/ChangeLog4
-rw-r--r--linuxthreads/internals.h10
2 files changed, 10 insertions, 4 deletions
diff --git a/linuxthreads/ChangeLog b/linuxthreads/ChangeLog
index 8ba4345f39..18c86f505d 100644
--- a/linuxthreads/ChangeLog
+++ b/linuxthreads/ChangeLog
@@ -1,3 +1,7 @@
+2002-03-22 Ulrich Drepper <drepper@redhat.com>
+
+ * internals.h (MEMORY_BARRIER): Define as asm with memory as clobber.
+
2002-03-17 Andreas Jaeger <aj@suse.de>
* sysdeps/i386/pt-machine.h: Add testandset and __compare_and_swap
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()