94 lines
2.0 KiB
C++
94 lines
2.0 KiB
C++
/*
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* synergy -- mouse and keyboard sharing utility
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* Copyright (C) 2012-2016 Symless Ltd.
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* Copyright (C) 2002 Chris Schoeneman
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*
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* This package is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* found in the file LICENSE that should have accompanied this file.
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*
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* This package is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "mt/CondVar.h"
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#include "arch/Arch.h"
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#include "base/Stopwatch.h"
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//
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// CondVarBase
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//
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CondVarBase::CondVarBase(Mutex* mutex) :
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m_mutex(mutex)
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{
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assert(m_mutex != NULL);
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m_cond = ARCH->newCondVar();
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}
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CondVarBase::~CondVarBase()
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{
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ARCH->closeCondVar(m_cond);
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}
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void
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CondVarBase::lock() const
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{
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m_mutex->lock();
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}
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void
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CondVarBase::unlock() const
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{
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m_mutex->unlock();
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}
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void
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CondVarBase::signal()
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{
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ARCH->signalCondVar(m_cond);
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}
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void
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CondVarBase::broadcast()
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{
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ARCH->broadcastCondVar(m_cond);
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}
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bool
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CondVarBase::wait(Stopwatch& timer, double timeout) const
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{
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double remain = timeout-timer.getTime();
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// Some ARCH wait()s return prematurely, retry until really timed out
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// In particular, ArchMultithreadPosix::waitCondVar() returns every 100ms
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do {
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// Always call wait at least once, even if remain is 0, to give
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// other thread a chance to grab the mutex to avoid deadlocks on
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// busy waiting.
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if (remain<0.0) { remain=0.0;
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}
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if (wait(remain)) {
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return true;
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}
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remain = timeout - timer.getTime();
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} while (remain >= 0.0);
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return false;
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}
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bool
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CondVarBase::wait(double timeout) const
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{
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return ARCH->waitCondVar(m_cond, m_mutex->m_mutex, timeout);
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}
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Mutex*
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CondVarBase::getMutex() const
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{
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return m_mutex;
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}
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