2012-08-30 Thiago Macieira PR libstdc++/54172 * libsupc++/guard.cc (__cxa_guard_acquire): Don't compare_exchange from a finished state back to a waiting state. --- libstdc++-v3/libsupc++/guard.cc | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libstdc++-v3/libsupc++/guard.cc b/libstdc++-v3/libsupc++/guard.cc index adc9608..4da9035 100644 --- a/libstdc++-v3/libsupc++/guard.cc +++ b/libstdc++-v3/libsupc++/guard.cc @@ -244,13 +244,13 @@ namespace __cxxabiv1 if (__gthread_active_p ()) { int *gi = (int *) (void *) g; - int expected(0); const int guard_bit = _GLIBCXX_GUARD_BIT; const int pending_bit = _GLIBCXX_GUARD_PENDING_BIT; const int waiting_bit = _GLIBCXX_GUARD_WAITING_BIT; while (1) { + int expected(0); if (__atomic_compare_exchange_n(gi, &expected, pending_bit, false, __ATOMIC_ACQ_REL, __ATOMIC_RELAXED)) -- 1.7.11.4