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waitable.cpp
61 lines (53 loc) · 1.51 KB
/
waitable.cpp
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/*
* The Doomsday Engine Project -- libdeng2
*
* Copyright (c) 2004-2013 Jaakko Keränen <jaakko.keranen@iki.fi>
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "de/Waitable"
#include "de/Time"
using namespace de;
Waitable::Waitable(duint initialValue) : _semaphore(initialValue)
{}
Waitable::~Waitable()
{}
void Waitable::reset()
{
_semaphore.tryAcquire(_semaphore.available());
}
void Waitable::wait() const
{
wait(0.0);
}
void Waitable::wait(TimeDelta const &timeOut) const
{
if(timeOut <= 0.0)
{
_semaphore.acquire();
}
else
{
// Wait until the resource becomes available.
if(!_semaphore.tryAcquire(1, int(timeOut.asMilliSeconds())))
{
/// @throw WaitError Failed to secure the resource due to an error.
throw WaitError("Waitable::wait", "Timed out");
}
}
}
void Waitable::post() const
{
_semaphore.release();
}