mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-15 06:08:35 +00:00
141 lines
3.7 KiB
C++
141 lines
3.7 KiB
C++
/* ScummVM - Scumm Interpreter
|
|
* Copyright (C) 2002-2003 The ScummVM project
|
|
*
|
|
* 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, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*
|
|
* $Header$
|
|
*/
|
|
|
|
#ifndef __MORPHOS__
|
|
|
|
#include "stdafx.h"
|
|
#include "common/scummsys.h"
|
|
#include "common/timer.h"
|
|
|
|
static Timer *g_timer = NULL;
|
|
|
|
Timer::Timer(Engine * engine) :
|
|
_engine(engine),
|
|
_mutex(0),
|
|
_timerHandler(0),
|
|
_lastTime(0) {
|
|
|
|
_mutex = _engine->_system->create_mutex();
|
|
|
|
g_timer = this;
|
|
|
|
for (int i = 0; i < MAX_TIMERS; i++) {
|
|
_timerSlots[i].procedure = NULL;
|
|
_timerSlots[i].interval = 0;
|
|
_timerSlots[i].counter = 0;
|
|
}
|
|
|
|
_thisTime = _engine->_system->get_msecs();
|
|
|
|
// Set the timer last, after everything has been initialised
|
|
_engine->_system->set_timer(10, &timer_handler);
|
|
|
|
}
|
|
|
|
Timer::~Timer() {
|
|
_engine->_system->set_timer(0, NULL);
|
|
|
|
_engine->_system->lock_mutex(_mutex);
|
|
for (int i = 0; i < MAX_TIMERS; i++) {
|
|
_timerSlots[i].procedure = NULL;
|
|
_timerSlots[i].interval = 0;
|
|
_timerSlots[i].counter = 0;
|
|
}
|
|
_engine->_system->unlock_mutex(_mutex);
|
|
|
|
// FIXME: There is still a potential race condition here, depending on how
|
|
// the system backend implements set_timer: If timers are done using
|
|
// threads, and if set_timer does *not* gurantee that after it terminates
|
|
// that timer thread is not run anymore, we are fine. However, if the timer
|
|
// is still running in parallel to this destructor, then it might be that
|
|
// it is still waiting for the _mutex. So, again depending on the backend,
|
|
// we might end up unlocking the mutex then immediately deleting it, while
|
|
// the timer thread is about to lock it.
|
|
_engine->_system->delete_mutex(_mutex);
|
|
}
|
|
|
|
int Timer::timer_handler(int t) {
|
|
if (g_timer)
|
|
return g_timer->handler(t);
|
|
return 0;
|
|
}
|
|
|
|
int Timer::handler(int t) {
|
|
uint32 interval, l;
|
|
|
|
_engine->_system->lock_mutex(_mutex);
|
|
|
|
_lastTime = _thisTime;
|
|
_thisTime = _engine->_system->get_msecs();
|
|
interval = 1000 * (_thisTime - _lastTime);
|
|
|
|
for (l = 0; l < MAX_TIMERS; l++) {
|
|
if ((_timerSlots[l].procedure) && (_timerSlots[l].interval > 0)) {
|
|
_timerSlots[l].counter -= interval;
|
|
if (_timerSlots[l].counter <= 0) {
|
|
_timerSlots[l].counter += _timerSlots[l].interval;
|
|
_timerSlots[l].procedure(_engine);
|
|
}
|
|
}
|
|
}
|
|
|
|
_engine->_system->unlock_mutex(_mutex);
|
|
|
|
return t;
|
|
}
|
|
|
|
bool Timer::installProcedure (TimerProc procedure, int32 interval) {
|
|
int32 l;
|
|
bool found = false;
|
|
|
|
_engine->_system->lock_mutex(_mutex);
|
|
for (l = 0; l < MAX_TIMERS; l++) {
|
|
if (!_timerSlots[l].procedure) {
|
|
_timerSlots[l].procedure = procedure;
|
|
_timerSlots[l].interval = interval;
|
|
_timerSlots[l].counter = interval;
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
_engine->_system->unlock_mutex(_mutex);
|
|
|
|
if (!found)
|
|
warning("Couldn't find free timer slot!");
|
|
|
|
return found;
|
|
}
|
|
|
|
void Timer::releaseProcedure (TimerProc procedure) {
|
|
int32 l;
|
|
|
|
_engine->_system->lock_mutex(_mutex);
|
|
for (l = 0; l < MAX_TIMERS; l++) {
|
|
if (_timerSlots[l].procedure == procedure) {
|
|
_timerSlots[l].procedure = 0;
|
|
_timerSlots[l].interval = 0;
|
|
_timerSlots[l].counter = 0;
|
|
}
|
|
}
|
|
_engine->_system->unlock_mutex(_mutex);
|
|
}
|
|
|
|
#endif
|