* [4.6] Fix PR libgcc/48076
@ 2012-11-29 21:21 Richard Henderson
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From: Richard Henderson @ 2012-11-29 21:21 UTC (permalink / raw)
To: GCC Patches
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A different fix is required for 4.6, because the __atomic
functions don't exist yet.
r~
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PR libgcc/48076
* emutls.c (__emutls_get_address): Add memory barrier before
referencing emutls_key.
diff --git a/gcc/emutls.c b/gcc/emutls.c
index b7ee3bd..fcf6eb5 100644
--- a/gcc/emutls.c
+++ b/gcc/emutls.c
@@ -151,6 +151,9 @@ __emutls_get_address (struct __emutls_object *obj)
__gthread_mutex_unlock (&emutls_mutex);
}
+ /* Do not allow emutls_key to be loaded before offset. */
+ __sync_synchronize();
+
struct __emutls_array *arr = __gthread_getspecific (emutls_key);
if (__builtin_expect (arr == NULL, 0))
{
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2012-11-29 21:21 [4.6] Fix PR libgcc/48076 Richard Henderson
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