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libstdc++: Fix std::atomic<std::shared_ptr<T>> for AIX [PR104101]

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This fixes an on AIX.

The lock function currently just spins, which should be changed to use
back-off, and maybe then _M_val.wait(__current) when supported.

libstdc++-v3/ChangeLog:

	PR libstdc++/104101
	* include/bits/shared_ptr_atomic.h (_Sp_atomic::_Atomic_count::lock):
	Only use __thread_relax if __cpp_lib_atomic_wait is defined.
This commit is contained in:
Jonathan Wakely 2022-01-18 21:15:05 +00:00
parent 7a761ae658
commit c3861f7985
1 changed files with 4 additions and 0 deletions
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4
libstdc++-v3/include/bits/shared_ptr_atomic.h
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@ -392,7 +392,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
auto __current = _M_val.load(memory_order_relaxed);
while (__current & _S_lock_bit)
{
#if __cpp_lib_atomic_wait
__detail::__thread_relax();
#endif
__current = _M_val.load(memory_order_relaxed);
}
@ -401,7 +403,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
__o,
memory_order_relaxed))
{
#if __cpp_lib_atomic_wait
__detail::__thread_relax();
#endif
__current = __current & ~_S_lock_bit;
}
return reinterpret_cast<pointer>(__current);