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libstdc++: Fix __thread_yield for non-gthreads targets

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The __gthread_yield() function is only defined for gthreads targets, so
check _GLIBCXX_HAS_GTHREADS before using it.

Also reorder __thread_relax and __thread_yield so that the former can
use the latter instead of repeating the same preprocessor checks.

libstdc++-v3/ChangeLog:

	* include/bits/atomic_wait.h (__thread_yield()): Check
	_GLIBCXX_HAS_GTHREADS before using __gthread_yield.
	(__thread_relax()): Use __thread_yield() instead of repeating
	the preprocessor checks for __gthread_yield.
This commit is contained in:
Jonathan Wakely 2021-02-15 15:35:55 +00:00
parent d27153f038
commit cc9a0a3d79
1 changed files with 10 additions and 11 deletions
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21
libstdc++-v3/include/bits/atomic_wait.h
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@ -213,24 +213,23 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{ _M_w._M_do_wait(_M_version); }
};
inline void
__thread_relax() noexcept
{
#if defined __i386__ || defined __x86_64__
__builtin_ia32_pause();
#elif defined _GLIBCXX_USE_SCHED_YIELD
__gthread_yield();
#endif
}
inline void
__thread_yield() noexcept
{
#if defined _GLIBCXX_USE_SCHED_YIELD
#if defined _GLIBCXX_HAS_GTHREADS && defined _GLIBCXX_USE_SCHED_YIELD
__gthread_yield();
#endif
}
inline void
__thread_relax() noexcept
{
#if defined __i386__ || defined __x86_64__
__builtin_ia32_pause();
#else
__gthread_yield();
#endif
}
} // namespace __detail
template<typename _Pred>