--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/symbian-qemu-0.9.1-12/libsdl-trunk/src/timer/SDL_timer.c Fri Jul 31 15:01:17 2009 +0100
@@ -0,0 +1,285 @@
+/*
+ SDL - Simple DirectMedia Layer
+ Copyright (C) 1997-2006 Sam Lantinga
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+ Sam Lantinga
+ slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+#include "SDL_timer.h"
+#include "SDL_timer_c.h"
+#include "SDL_mutex.h"
+#include "SDL_systimer.h"
+
+/* #define DEBUG_TIMERS */
+
+int SDL_timer_started = 0;
+int SDL_timer_running = 0;
+
+/* Data to handle a single periodic alarm */
+Uint32 SDL_alarm_interval = 0;
+SDL_TimerCallback SDL_alarm_callback;
+
+/* Data used for a thread-based timer */
+static int SDL_timer_threaded = 0;
+
+struct _SDL_TimerID {
+ Uint32 interval;
+ SDL_NewTimerCallback cb;
+ void *param;
+ Uint32 last_alarm;
+ struct _SDL_TimerID *next;
+};
+
+static SDL_TimerID SDL_timers = NULL;
+static SDL_mutex *SDL_timer_mutex;
+static volatile SDL_bool list_changed = SDL_FALSE;
+
+/* Set whether or not the timer should use a thread.
+ This should not be called while the timer subsystem is running.
+*/
+int SDL_SetTimerThreaded(int value)
+{
+ int retval;
+
+ if ( SDL_timer_started ) {
+ SDL_SetError("Timer already initialized");
+ retval = -1;
+ } else {
+ retval = 0;
+ SDL_timer_threaded = value;
+ }
+ return retval;
+}
+
+int SDL_TimerInit(void)
+{
+ int retval;
+
+ retval = 0;
+ if ( SDL_timer_started ) {
+ SDL_TimerQuit();
+ }
+ if ( ! SDL_timer_threaded ) {
+ retval = SDL_SYS_TimerInit();
+ }
+ if ( SDL_timer_threaded ) {
+ SDL_timer_mutex = SDL_CreateMutex();
+ }
+ if ( retval == 0 ) {
+ SDL_timer_started = 1;
+ }
+ return(retval);
+}
+
+void SDL_TimerQuit(void)
+{
+ SDL_SetTimer(0, NULL);
+ if ( SDL_timer_threaded < 2 ) {
+ SDL_SYS_TimerQuit();
+ }
+ if ( SDL_timer_threaded ) {
+ SDL_DestroyMutex(SDL_timer_mutex);
+ SDL_timer_mutex = NULL;
+ }
+ SDL_timer_started = 0;
+ SDL_timer_threaded = 0;
+}
+
+void SDL_ThreadedTimerCheck(void)
+{
+ Uint32 now, ms;
+ SDL_TimerID t, prev, next;
+ SDL_bool removed;
+
+ SDL_mutexP(SDL_timer_mutex);
+ list_changed = SDL_FALSE;
+ now = SDL_GetTicks();
+ for ( prev = NULL, t = SDL_timers; t; t = next ) {
+ removed = SDL_FALSE;
+ ms = t->interval - SDL_TIMESLICE;
+ next = t->next;
+ if ( (int)(now - t->last_alarm) > (int)ms ) {
+ struct _SDL_TimerID timer;
+
+ if ( (now - t->last_alarm) < t->interval ) {
+ t->last_alarm += t->interval;
+ } else {
+ t->last_alarm = now;
+ }
+#ifdef DEBUG_TIMERS
+ printf("Executing timer %p (thread = %d)\n",
+ t, SDL_ThreadID());
+#endif
+ timer = *t;
+ SDL_mutexV(SDL_timer_mutex);
+ ms = timer.cb(timer.interval, timer.param);
+ SDL_mutexP(SDL_timer_mutex);
+ if ( list_changed ) {
+ /* Abort, list of timers modified */
+ /* FIXME: what if ms was changed? */
+ break;
+ }
+ if ( ms != t->interval ) {
+ if ( ms ) {
+ t->interval = ROUND_RESOLUTION(ms);
+ } else {
+ /* Remove timer from the list */
+#ifdef DEBUG_TIMERS
+ printf("SDL: Removing timer %p\n", t);
+#endif
+ if ( prev ) {
+ prev->next = next;
+ } else {
+ SDL_timers = next;
+ }
+ SDL_free(t);
+ --SDL_timer_running;
+ removed = SDL_TRUE;
+ }
+ }
+ }
+ /* Don't update prev if the timer has disappeared */
+ if ( ! removed ) {
+ prev = t;
+ }
+ }
+ SDL_mutexV(SDL_timer_mutex);
+}
+
+static SDL_TimerID SDL_AddTimerInternal(Uint32 interval, SDL_NewTimerCallback callback, void *param)
+{
+ SDL_TimerID t;
+ t = (SDL_TimerID) SDL_malloc(sizeof(struct _SDL_TimerID));
+ if ( t ) {
+ t->interval = ROUND_RESOLUTION(interval);
+ t->cb = callback;
+ t->param = param;
+ t->last_alarm = SDL_GetTicks();
+ t->next = SDL_timers;
+ SDL_timers = t;
+ ++SDL_timer_running;
+ list_changed = SDL_TRUE;
+ }
+#ifdef DEBUG_TIMERS
+ printf("SDL_AddTimer(%d) = %08x num_timers = %d\n", interval, (Uint32)t, SDL_timer_running);
+#endif
+ return t;
+}
+
+SDL_TimerID SDL_AddTimer(Uint32 interval, SDL_NewTimerCallback callback, void *param)
+{
+ SDL_TimerID t;
+ if ( ! SDL_timer_mutex ) {
+ if ( SDL_timer_started ) {
+ SDL_SetError("This platform doesn't support multiple timers");
+ } else {
+ SDL_SetError("You must call SDL_Init(SDL_INIT_TIMER) first");
+ }
+ return NULL;
+ }
+ if ( ! SDL_timer_threaded ) {
+ SDL_SetError("Multiple timers require threaded events!");
+ return NULL;
+ }
+ SDL_mutexP(SDL_timer_mutex);
+ t = SDL_AddTimerInternal(interval, callback, param);
+ SDL_mutexV(SDL_timer_mutex);
+ return t;
+}
+
+SDL_bool SDL_RemoveTimer(SDL_TimerID id)
+{
+ SDL_TimerID t, prev = NULL;
+ SDL_bool removed;
+
+ removed = SDL_FALSE;
+ SDL_mutexP(SDL_timer_mutex);
+ /* Look for id in the linked list of timers */
+ for (t = SDL_timers; t; prev=t, t = t->next ) {
+ if ( t == id ) {
+ if(prev) {
+ prev->next = t->next;
+ } else {
+ SDL_timers = t->next;
+ }
+ SDL_free(t);
+ --SDL_timer_running;
+ removed = SDL_TRUE;
+ list_changed = SDL_TRUE;
+ break;
+ }
+ }
+#ifdef DEBUG_TIMERS
+ printf("SDL_RemoveTimer(%08x) = %d num_timers = %d thread = %d\n", (Uint32)id, removed, SDL_timer_running, SDL_ThreadID());
+#endif
+ SDL_mutexV(SDL_timer_mutex);
+ return removed;
+}
+
+/* Old style callback functions are wrapped through this */
+static Uint32 SDLCALL callback_wrapper(Uint32 ms, void *param)
+{
+ SDL_TimerCallback func = (SDL_TimerCallback) param;
+ return (*func)(ms);
+}
+
+int SDL_SetTimer(Uint32 ms, SDL_TimerCallback callback)
+{
+ int retval;
+
+#ifdef DEBUG_TIMERS
+ printf("SDL_SetTimer(%d)\n", ms);
+#endif
+ retval = 0;
+
+ if ( SDL_timer_threaded ) {
+ SDL_mutexP(SDL_timer_mutex);
+ }
+ if ( SDL_timer_running ) { /* Stop any currently running timer */
+ if ( SDL_timer_threaded ) {
+ while ( SDL_timers ) {
+ SDL_TimerID freeme = SDL_timers;
+ SDL_timers = SDL_timers->next;
+ SDL_free(freeme);
+ }
+ SDL_timer_running = 0;
+ list_changed = SDL_TRUE;
+ } else {
+ SDL_SYS_StopTimer();
+ SDL_timer_running = 0;
+ }
+ }
+ if ( ms ) {
+ if ( SDL_timer_threaded ) {
+ if ( SDL_AddTimerInternal(ms, callback_wrapper, (void *)callback) == NULL ) {
+ retval = -1;
+ }
+ } else {
+ SDL_timer_running = 1;
+ SDL_alarm_interval = ms;
+ SDL_alarm_callback = callback;
+ retval = SDL_SYS_StartTimer();
+ }
+ }
+ if ( SDL_timer_threaded ) {
+ SDL_mutexV(SDL_timer_mutex);
+ }
+
+ return retval;
+}