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author | rth <rth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-11-28 21:01:26 +0000 |
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committer | rth <rth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-11-28 21:01:26 +0000 |
commit | f0b6dfa6477590110bf9bd18d6c3cfa2e66420fe (patch) | |
tree | f08c3d71c7d0d279f944d16c9cc812bbd7a2220a /libgcc/emutls.c | |
parent | 80d4c05f76e0073a56d14287151cb29929a7ba63 (diff) | |
download | gcc-f0b6dfa6477590110bf9bd18d6c3cfa2e66420fe.tar.gz |
PR libgcc/48076
* emutls.c (__emutls_get_address): Avoid race condition between
obj->loc.offset read and emutls_key initialization.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@193907 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'libgcc/emutls.c')
-rw-r--r-- | libgcc/emutls.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/libgcc/emutls.c b/libgcc/emutls.c index 22ea4403edb..f1b653b7d54 100644 --- a/libgcc/emutls.c +++ b/libgcc/emutls.c @@ -136,7 +136,7 @@ __emutls_get_address (struct __emutls_object *obj) #ifndef __GTHREADS abort (); #else - pointer offset = obj->loc.offset; + pointer offset = __atomic_load_n (&obj->loc.offset, __ATOMIC_ACQUIRE); if (__builtin_expect (offset == 0, 0)) { @@ -147,7 +147,7 @@ __emutls_get_address (struct __emutls_object *obj) if (offset == 0) { offset = ++emutls_size; - obj->loc.offset = offset; + __atomic_store_n (&obj->loc.offset, offset, __ATOMIC_RELEASE); } __gthread_mutex_unlock (&emutls_mutex); } |