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[libcxx] Fix building for windows after 54fa9ecd30

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Move the implementation of __libcpp_thread_poll_with_backoff
and __libcpp_timed_backoff_policy::operator() out of the
_LIBCPP_HAS_THREAD_API_PTHREAD block. None of the code in these
methods is pthreads specific.

Also add "inline _LIBCPP_INLINE_VISIBILITY" to
__libcpp_timed_backoff_policy::operator(), to avoid errors due to
multiple definitions of the operator. Contrary to
__libcpp_thread_poll_with_backoff (which is a template function),
this is a normal non-templated method.

Differential Revision: https://reviews.llvm.org/D75102
This commit is contained in:
Martin Storsjö 2020-02-25 09:36:24 +02:00
parent 922558be9e
commit e3add3e5a1
1 changed files with 35 additions and 34 deletions
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69
libcxx/include/__threading_support
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@ -494,40 +494,6 @@ void __libcpp_thread_sleep_for(const chrono::nanoseconds& __ns)
while (nanosleep(&__ts, &__ts) == -1 && errno == EINTR);
}
bool __libcpp_timed_backoff_policy::operator()(chrono::nanoseconds __elapsed) const
{
if(__elapsed > chrono::milliseconds(128))
__libcpp_thread_sleep_for(chrono::milliseconds(8));
else if(__elapsed > chrono::microseconds(64))
__libcpp_thread_sleep_for(__elapsed / 2);
else if(__elapsed > chrono::microseconds(4))
__libcpp_thread_yield();
else
; // poll
return false;
}
static _LIBCPP_CONSTEXPR const int __libcpp_polling_count = 64;
template<class _Fn, class _BFn>
bool __libcpp_thread_poll_with_backoff(_Fn && __f, _BFn && __bf, chrono::nanoseconds __max_elapsed)
{
auto const __start = chrono::high_resolution_clock::now();
for(int __count = 0;;) {
if(__f())
return true; // _Fn completion means success
if(__count < __libcpp_polling_count) {
__count += 1;
continue;
}
chrono::nanoseconds const __elapsed = chrono::high_resolution_clock::now() - __start;
if(__max_elapsed != chrono::nanoseconds::zero() && __max_elapsed < __elapsed)
return false; // timeout failure
if(__bf(__elapsed))
return false; // _BFn completion means failure
}
}
// Thread local storage
int __libcpp_tls_create(__libcpp_tls_key *__key, void (*__at_exit)(void *))
{
@ -703,6 +669,41 @@ int __libcpp_tls_set(__libcpp_tls_key __key, void *__p)
#endif
inline _LIBCPP_INLINE_VISIBILITY
bool __libcpp_timed_backoff_policy::operator()(chrono::nanoseconds __elapsed) const
{
if(__elapsed > chrono::milliseconds(128))
__libcpp_thread_sleep_for(chrono::milliseconds(8));
else if(__elapsed > chrono::microseconds(64))
__libcpp_thread_sleep_for(__elapsed / 2);
else if(__elapsed > chrono::microseconds(4))
__libcpp_thread_yield();
else
; // poll
return false;
}
static _LIBCPP_CONSTEXPR const int __libcpp_polling_count = 64;
template<class _Fn, class _BFn>
bool __libcpp_thread_poll_with_backoff(_Fn && __f, _BFn && __bf, chrono::nanoseconds __max_elapsed)
{
auto const __start = chrono::high_resolution_clock::now();
for(int __count = 0;;) {
if(__f())
return true; // _Fn completion means success
if(__count < __libcpp_polling_count) {
__count += 1;
continue;
}
chrono::nanoseconds const __elapsed = chrono::high_resolution_clock::now() - __start;
if(__max_elapsed != chrono::nanoseconds::zero() && __max_elapsed < __elapsed)
return false; // timeout failure
if(__bf(__elapsed))
return false; // _BFn completion means failure
}
}
#endif // !_LIBCPP_HAS_THREAD_LIBRARY_EXTERNAL || _LIBCPP_BUILDING_THREAD_LIBRARY_EXTERNAL
class _LIBCPP_TYPE_VIS thread;