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re PR libstdc++/53841 ([C++11] condition_variable::wait_until() fails with high resolution clocks) 

PR libstdc++/53841
	* include/std/condition_variable (condition_variable::wait_until):
	Handle clocks with higher resolution than __clock_t.
	(condition_variable::__wait_until_impl): Remove unnecessary _Clock
	parameter.
	* testsuite/30_threads/condition_variable/members/53841.cc: New.

From-SVN: r193523
This commit is contained in:
Jonathan Wakely 2012-11-15 01:38:17 +00:00 committed by Jonathan Wakely
parent 6c2b4cacb9
commit c25639b1a3
3 changed files with 67 additions and 11 deletions
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9
libstdc++-v3/ChangeLog
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@ -1,3 +1,12 @@
2012-11-15 Jonathan Wakely <jwakely.gcc@gmail.com>
PR libstdc++/53841
* include/std/condition_variable (condition_variable::wait_until):
Handle clocks with higher resolution than __clock_t.
(condition_variable::__wait_until_impl): Remove unnecessary _Clock
parameter.
* testsuite/30_threads/condition_variable/members/53841.cc: New.
2012-11-14 Jonathan Wakely <jwakely.gcc@gmail.com>
PR libstdc++/55320

19
libstdc++-v3/include/std/condition_variable
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@ -1,6 +1,6 @@
// <condition_variable> -*- C++ -*-
// Copyright (C) 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
// Copyright (C) 2008-2012 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
@ -107,8 +107,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// DR 887 - Sync unknown clock to known clock.
const typename _Clock::time_point __c_entry = _Clock::now();
const __clock_t::time_point __s_entry = __clock_t::now();
const chrono::nanoseconds __delta = __atime - __c_entry;
const __clock_t::time_point __s_atime = __s_entry + __delta;
const auto __delta = __atime - __c_entry;
const auto __s_atime = __s_entry + __delta;
return __wait_until_impl(__lock, __s_atime);
}
@ -143,16 +143,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{ return &_M_cond; }
private:
template<typename _Clock, typename _Duration>
template<typename _Dur>
cv_status
__wait_until_impl(unique_lock<mutex>& __lock,
const chrono::time_point<_Clock, _Duration>& __atime)
const chrono::time_point<__clock_t, _Dur>& __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 =
{
@ -163,7 +160,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
__gthread_cond_timedwait(&_M_cond, __lock.mutex()->native_handle(),
&__ts);
return (_Clock::now() < __atime
return (__clock_t::now() < __atime
? cv_status::no_timeout : cv_status::timeout);
}
};

50
libstdc++-v3/testsuite/30_threads/condition_variable/members/53841.cc Normal file
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@ -0,0 +1,50 @@
// { dg-do compile }
// { dg-options " -std=gnu++0x -pthread" { target *-*-freebsd* *-*-netbsd* *-*-linux* powerpc-ibm-aix* } }
// { dg-options " -std=gnu++0x -pthreads" { target *-*-solaris* } }
// { dg-options " -std=gnu++0x " { target *-*-cygwin *-*-darwin* } }
// { dg-require-cstdint "" }
// { dg-require-gthreads "" }
// Copyright (C) 2012 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// PR libstdc++/53841
#include <chrono>
#include <mutex>
#include <condition_variable>
namespace ch = std::chrono;
struct FPClock : ch::system_clock
{
typedef double rep;
typedef std::ratio<1> period;
typedef ch::duration<rep, period> duration;
typedef ch::time_point<FPClock> time_point;
static time_point now()
{ return time_point(duration(system_clock::now().time_since_epoch())); }
};
void f()
{
std::mutex mx;
std::unique_lock<std::mutex> l(mx);
std::condition_variable cv;
cv.wait_until(l, FPClock::now());
}