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[libstdc++] Add missing _M_try_acquire() to __platform_semaphore

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libstdc++-v3/ChangeLog:
	* include/bits/semaphore_base.h: Add missing _M_try_acquire()
	member to __platform_wait.
This commit is contained in:
Thomas Rodgers 2021-04-21 08:15:16 -07:00
parent 7f9b7ccf0c
commit 5445da1a94
1 changed files with 18 additions and 0 deletions
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18
libstdc++-v3/include/bits/semaphore_base.h
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@ -86,6 +86,24 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
}
}
_GLIBCXX_ALWAYS_INLINE bool
_M_try_acquire() noexcept
{
for (;;)
{
auto __err = sem_trywait(&_M_semaphore);
if (__err && (errno == EINTR))
continue;
else if (__err && (errno == EAGAIN))
return false;
else if (__err)
std::terminate();
else
break;
}
return true;
}
_GLIBCXX_ALWAYS_INLINE void
_M_release(std::ptrdiff_t __update) noexcept
{