timerman.cpp

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/* xoreos - A reimplementation of BioWare's Aurora engine
 *
 * xoreos is the legal property of its developers, whose names
 * can be found in the AUTHORS file distributed with this source
 * distribution.
 *
 * xoreos 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
 * of the License, or (at your option) any later version.
 *
 * xoreos 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 xoreos. If not, see <http://www.gnu.org/licenses/>.
 */

#include "src/common/error.h"

#include "src/events/timerman.h"

DECLARE_SINGLETON(Events::TimerManager)

namespace Events {

TimerHandle::TimerHandle() : _empty(true) {
}

TimerHandle::~TimerHandle() {
    TimerMan.removeTimer(*this);
}


TimerManager::TimerManager() {
}

TimerManager::~TimerManager() {
    for (std::list<TimerID>::iterator t = _timers.begin(); t != _timers.end(); ++t)
        removeTimer(*t);
}

void TimerManager::init() {
}

void TimerManager::addTimer(uint32 interval, TimerHandle &handle, const TimerFunc &func) {
    Common::StackLock lock(_mutex);

    removeTimer(handle);

    _timers.push_back(TimerID());

    std::list<TimerID>::iterator id = --_timers.end();

    handle._iterator = id;
    handle._empty    = false;

    id->_func = func;
    id->_id   = SDL_AddTimer(interval, &TimerManager::timerCallback, static_cast<void *>(&handle));
    if (id->_id)
        return;

    handle._iterator = _timers.end();
    handle._empty    = true;

    _timers.erase(id);

    throw Common::Exception("Failed to add timer");
}

void TimerManager::removeTimer(TimerHandle &handle) {
    Common::StackLock lock(_mutex);

    if (handle._empty)
        return;

    removeTimer(*handle._iterator);

    _timers.erase(handle._iterator);

    handle._iterator = _timers.end();
    handle._empty    = true;
}

void TimerManager::removeTimer(TimerID &id) {
    if (id._id == 0)
        return;

    SDL_RemoveTimer(id._id);
}

uint32 TimerManager::timerCallback(uint32 interval, void *data) {
    TimerHandle &handle = *static_cast<TimerHandle *>(data);

    if (handle._empty)
        return 0;

    uint32 newInterval = handle._iterator->_func(interval);
    if (newInterval == 0) {
        handle._iterator->_id = 0;
        TimerMan.removeTimer(handle);
        return 0;
    }

    return newInterval;
}

} // End of namespace Events