Changes since SDL 1.2.0 release
--HG-- extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%402
This commit is contained in:
Sam Lantinga
parent
2f110628a7
commit
9b6cc5a90d
40 changed files with 1225 additions and 105 deletions
286
src/timer/SDL_timer.c
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286
src/timer/SDL_timer.c
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/*
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SDL - Simple DirectMedia Layer
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Copyright (C) 1997, 1998 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Sam Lantinga
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5635-34 Springhouse Dr.
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Pleasanton, CA 94588 (USA)
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slouken@devolution.com
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*/
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#ifdef SAVE_RCSID
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static char rcsid =
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"@(#) $Id$";
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#endif
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#include <stdlib.h>
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#include <stdio.h> /* For the definition of NULL */
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#include "SDL_error.h"
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#include "SDL_timer.h"
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#include "SDL_timer_c.h"
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#include "SDL_mutex.h"
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#include "SDL_systimer.h"
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/* #define DEBUG_TIMERS */
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int SDL_timer_started = 0;
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int SDL_timer_running = 0;
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/* Data to handle a single periodic alarm */
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Uint32 SDL_alarm_interval = 0;
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SDL_TimerCallback SDL_alarm_callback;
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static SDL_bool list_changed = SDL_FALSE;
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/* Data used for a thread-based timer */
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static int SDL_timer_threaded = 0;
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struct _SDL_TimerID {
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Uint32 interval;
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SDL_NewTimerCallback cb;
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void *param;
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Uint32 last_alarm;
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struct _SDL_TimerID *next;
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};
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static SDL_TimerID SDL_timers = NULL;
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static Uint32 num_timers = 0;
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static SDL_mutex *SDL_timer_mutex;
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/* Set whether or not the timer should use a thread.
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This should not be called while the timer subsystem is running.
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*/
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int SDL_SetTimerThreaded(int value)
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{
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int retval;
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if ( SDL_timer_started ) {
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SDL_SetError("Timer already initialized");
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retval = -1;
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} else {
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retval = 0;
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SDL_timer_threaded = value;
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}
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return retval;
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}
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int SDL_TimerInit(void)
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{
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int retval;
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SDL_timer_running = 0;
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SDL_SetTimer(0, NULL);
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retval = 0;
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if ( ! SDL_timer_threaded ) {
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retval = SDL_SYS_TimerInit();
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}
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if ( SDL_timer_threaded ) {
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SDL_timer_mutex = SDL_CreateMutex();
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}
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SDL_timer_started = 1;
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return(retval);
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}
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void SDL_TimerQuit(void)
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{
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SDL_SetTimer(0, NULL);
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if ( SDL_timer_threaded < 2 ) {
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SDL_SYS_TimerQuit();
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}
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if ( SDL_timer_threaded ) {
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SDL_DestroyMutex(SDL_timer_mutex);
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}
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SDL_timer_started = 0;
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SDL_timer_threaded = 0;
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}
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void SDL_ThreadedTimerCheck(void)
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{
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Uint32 now, ms;
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SDL_TimerID t, prev, next;
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int removed;
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now = SDL_GetTicks();
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SDL_mutexP(SDL_timer_mutex);
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for ( prev = NULL, t = SDL_timers; t; t = next ) {
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removed = 0;
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ms = t->interval - SDL_TIMESLICE;
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next = t->next;
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if ( (t->last_alarm < now) && ((now - t->last_alarm) > ms) ) {
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if ( (now - t->last_alarm) < t->interval ) {
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t->last_alarm += t->interval;
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} else {
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t->last_alarm = now;
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}
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list_changed = SDL_FALSE;
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#ifdef DEBUG_TIMERS
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printf("Executing timer %p (thread = %d)\n",
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t, SDL_ThreadID());
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#endif
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SDL_mutexV(SDL_timer_mutex);
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ms = t->cb(t->interval, t->param);
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SDL_mutexP(SDL_timer_mutex);
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if ( list_changed ) {
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/* Abort, list of timers has been modified */
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break;
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}
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if ( ms != t->interval ) {
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if ( ms ) {
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t->interval = ROUND_RESOLUTION(ms);
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} else { /* Remove the timer from the linked list */
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#ifdef DEBUG_TIMERS
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printf("SDL: Removing timer %p\n", t);
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#endif
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if ( prev ) {
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prev->next = next;
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} else {
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SDL_timers = next;
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}
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free(t);
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-- num_timers;
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removed = 1;
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}
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}
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}
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/* Don't update prev if the timer has disappeared */
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if ( ! removed ) {
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prev = t;
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}
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}
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SDL_mutexV(SDL_timer_mutex);
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}
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SDL_TimerID SDL_AddTimer(Uint32 interval, SDL_NewTimerCallback callback, void *param)
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{
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SDL_TimerID t;
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if ( ! SDL_timer_mutex ) {
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if ( SDL_timer_started ) {
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SDL_SetError("This platform doesn't support multiple timers");
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} else {
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SDL_SetError("You must call SDL_Init(SDL_INIT_TIMER) first");
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}
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return NULL;
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}
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if ( ! SDL_timer_threaded ) {
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SDL_SetError("Multiple timers require threaded events!");
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return NULL;
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}
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SDL_mutexP(SDL_timer_mutex);
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t = (SDL_TimerID) malloc(sizeof(struct _SDL_TimerID));
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if ( t ) {
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t->interval = ROUND_RESOLUTION(interval);
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t->cb = callback;
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t->param = param;
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t->last_alarm = SDL_GetTicks();
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t->next = SDL_timers;
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SDL_timers = t;
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++ num_timers;
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list_changed = SDL_TRUE;
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SDL_timer_running = 1;
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}
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#ifdef DEBUG_TIMERS
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printf("SDL_AddTimer(%d) = %08x num_timers = %d\n", interval, (Uint32)t, num_timers);
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#endif
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SDL_mutexV(SDL_timer_mutex);
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return t;
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}
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SDL_bool SDL_RemoveTimer(SDL_TimerID id)
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{
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SDL_TimerID t, prev = NULL;
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SDL_bool removed;
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removed = SDL_FALSE;
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SDL_mutexP(SDL_timer_mutex);
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/* Look for id in the linked list of timers */
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for (t = SDL_timers; t; prev=t, t = t->next ) {
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if ( t == id ) {
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if(prev) {
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prev->next = t->next;
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} else {
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SDL_timers = t->next;
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}
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free(t);
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-- num_timers;
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removed = SDL_TRUE;
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list_changed = SDL_TRUE;
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break;
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}
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}
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#ifdef DEBUG_TIMERS
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printf("SDL_RemoveTimer(%08x) = %d num_timers = %d thread = %d\n", (Uint32)id, removed, num_timers, SDL_ThreadID());
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#endif
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SDL_mutexV(SDL_timer_mutex);
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return removed;
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}
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static void SDL_RemoveAllTimers(SDL_TimerID t)
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{
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SDL_TimerID freeme;
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/* Changed to non-recursive implementation.
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The recursive implementation is elegant, but subject to
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stack overflow if there are lots and lots of timers.
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*/
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while ( t ) {
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freeme = t;
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t = t->next;
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free(freeme);
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}
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}
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/* Old style callback functions are wrapped through this */
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static Uint32 callback_wrapper(Uint32 ms, void *param)
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{
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SDL_TimerCallback func = (SDL_TimerCallback) param;
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return (*func)(ms);
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}
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int SDL_SetTimer(Uint32 ms, SDL_TimerCallback callback)
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{
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int retval;
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#ifdef DEBUG_TIMERS
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printf("SDL_SetTimer(%d)\n", ms);
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#endif
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retval = 0;
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if ( SDL_timer_running ) { /* Stop any currently running timer */
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SDL_timer_running = 0;
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if ( SDL_timer_threaded ) {
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SDL_mutexP(SDL_timer_mutex);
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SDL_RemoveAllTimers(SDL_timers);
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SDL_timers = NULL;
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SDL_mutexV(SDL_timer_mutex);
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} else {
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SDL_SYS_StopTimer();
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}
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}
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if ( ms ) {
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if ( SDL_timer_threaded ) {
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retval = (SDL_AddTimer(ms, callback_wrapper,
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(void *)callback) != NULL);
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} else {
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SDL_timer_running = 1;
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SDL_alarm_interval = ms;
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SDL_alarm_callback = callback;
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retval = SDL_SYS_StartTimer();
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}
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}
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return retval;
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}
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