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re PR libstdc++/54562 (mutex and condition variable timers)

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PR libstdc++/54562
	* include/std/mutex (__timed_mutex_impl::__clock_t): Use
	high_resolution_clock for absolute timeouts, because
	pthread_mutex_timedlock uses CLOCK_REALTIME not CLOCK_MONOTONIC.
	(__timed_mutex_impl::_M_try_lock_for): Use steady_clock for relative
	timeouts as per [thread.req.timing].
	(__timed_mutex_impl::_M_try_lock_until<Clock,Duration>): Convert to
	__clock_t time point instead of using _M_try_lock_for.

From-SVN: r204672
This commit is contained in:
Jonathan Wakely 2013-11-11 13:33:48 +00:00 • committed by Jonathan Wakely
parent 1a80085d42
commit 6162239973
2 changed files with 21 additions and 14 deletions
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11
libstdc++-v3/ChangeLog
View file

@ -1,3 +1,14 @@
2013-11-11 Jonathan Wakely <jwakely.gcc@gmail.com>
PR libstdc++/54562
* include/std/mutex (__timed_mutex_impl::__clock_t): Use
high_resolution_clock for absolute timeouts, because
pthread_mutex_timedlock uses CLOCK_REALTIME not CLOCK_MONOTONIC.
(__timed_mutex_impl::_M_try_lock_for): Use steady_clock for relative
timeouts as per [thread.req.timing].
(__timed_mutex_impl::_M_try_lock_until<Clock,Duration>): Convert to
__clock_t time point instead of using _M_try_lock_for.
2013-11-09 Jonathan Wakely <jwakely.gcc@gmail.com>
PR libstdc++/58982

24
libstdc++-v3/include/std/mutex
View file

@ -203,21 +203,17 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
class __timed_mutex_impl
{
protected:
#ifdef _GLIBCXX_USE_CLOCK_MONOTONIC
typedef chrono::steady_clock __clock_t;
#else
typedef chrono::high_resolution_clock __clock_t;
#endif
template<typename _Rep, typename _Period>
bool
_M_try_lock_for(const chrono::duration<_Rep, _Period>& __rtime)
{
auto __rt = chrono::duration_cast<__clock_t::duration>(__rtime);
if (ratio_greater<__clock_t::period, _Period>())
using chrono::steady_clock;
auto __rt = chrono::duration_cast<steady_clock::duration>(__rtime);
if (ratio_greater<steady_clock::period, _Period>())
++__rt;
return _M_try_lock_until(__clock_t::now() + __rt);
return _M_try_lock_until(steady_clock::now() + __rt);
}
template<typename _Duration>
@ -225,11 +221,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_M_try_lock_until(const chrono::time_point<__clock_t,
_Duration>& __atime)
{
chrono::time_point<__clock_t, chrono::seconds> __s =
chrono::time_point_cast<chrono::seconds>(__atime);
chrono::nanoseconds __ns =
chrono::duration_cast<chrono::nanoseconds>(__atime - __s);
auto __s = chrono::time_point_cast<chrono::seconds>(__atime);
auto __ns = chrono::duration_cast<chrono::nanoseconds>(__atime - __s);
__gthread_time_t __ts = {
static_cast<std::time_t>(__s.time_since_epoch().count()),
@ -243,7 +236,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
template<typename _Clock, typename _Duration>
bool
_M_try_lock_until(const chrono::time_point<_Clock, _Duration>& __atime)
{ return _M_try_lock_for(__atime - _Clock::now()); }
{
auto __rtime = __atime - _Clock::now();
return _M_try_lock_until(__clock_t::now() + __rtime);
}
};
/// timed_mutex