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libstdc++: Strengthen memory order for atomic<T>::wait/notify 

This changes the memory order used in the spin wait code to match
that of libc++.

libstdc++-v3/ChangeLog:
	* include/bits/atomic_wait.h (__waiter_base::_S_do_spin,
	__waiter_base::_S_do_spin_v): Change memory order from relaxed
	to acquire.
This commit is contained in:
Thomas Rodgers 2022-02-10 10:12:36 -08:00
parent c22f3fb780
commit b25a7c05f1
1 changed files with 2 additions and 2 deletions
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4
libstdc++-v3/include/bits/atomic_wait.h
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@ -332,7 +332,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
}
else
{
__atomic_load(__addr, &__val, __ATOMIC_RELAXED);
__atomic_load(__addr, &__val, __ATOMIC_ACQUIRE);
}
return __atomic_spin(__pred, __spin);
}
@ -353,7 +353,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
__platform_wait_t& __val,
_Spin __spin = _Spin{ })
{
__atomic_load(__addr, &__val, __ATOMIC_RELAXED);
__atomic_load(__addr, &__val, __ATOMIC_ACQUIRE);
return __atomic_spin(__pred, __spin);
}