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Backport 2002-03-22 fix from newer linuxthreads versions defining

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MEMORY_BARRIER() as a asm op which clobbers memory to avoid unintended
reordering by the compiler.
This commit is contained in:
Tor Egge 2006-05-28 17:32:39 +00:00
parent 9e5965a07a
commit c717b11e0d
Notes: svn2git 2021-03-31 03:12:20 +00:00 
svn path=/head/; revision=163743
1 changed files with 21 additions and 0 deletions
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devel/linuxthreads/files/patch-barrier Normal file
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@ -0,0 +1,21 @@
--- internals.h.orig Tue May 16 00:23:50 2006
+++ internals.h Tue May 16 00:24:21 2006
@@ -395,12 +395,14 @@
#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()