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annotate src/timer/SDL_timer.c @ 1361:19418e4422cb

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New configure-based build system. Still work in progress, but much improved
author Sam Lantinga <slouken@libsdl.org>
date Thu, 16 Feb 2006 10:11:48 +0000
parents c71e05b4dc2e
children d910939febfa
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 #include "SDL_timer.h"
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24 #include "SDL_timer_c.h"
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25 #include "SDL_mutex.h"
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26 #include "SDL_systimer.h"
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27
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28 /* #define DEBUG_TIMERS */
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29
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30 int SDL_timer_started = 0;
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31 int SDL_timer_running = 0;
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32
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33 /* Data to handle a single periodic alarm */
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34 Uint32 SDL_alarm_interval = 0;
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35 SDL_TimerCallback SDL_alarm_callback;
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36
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37 /* Data used for a thread-based timer */
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38 static int SDL_timer_threaded = 0;
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39
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40 struct _SDL_TimerID {
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41 Uint32 interval;
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42 SDL_NewTimerCallback cb;
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43 void *param;
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44 Uint32 last_alarm;
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45 struct _SDL_TimerID *next;
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46 };
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47
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48 static SDL_TimerID SDL_timers = NULL;
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49 static SDL_mutex *SDL_timer_mutex;
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50 static volatile SDL_bool list_changed = SDL_FALSE;
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51
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52 /* Set whether or not the timer should use a thread.
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53 This should not be called while the timer subsystem is running.
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54 */
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55 int SDL_SetTimerThreaded(int value)
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56 {
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57 int retval;
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58
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59 if ( SDL_timer_started ) {
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60 SDL_SetError("Timer already initialized");
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61 retval = -1;
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62 } else {
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63 retval = 0;
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64 SDL_timer_threaded = value;
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65 }
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66 return retval;
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67 }
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68
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69 int SDL_TimerInit(void)
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70 {
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71 int retval;
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72
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73 retval = 0;
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74 if ( SDL_timer_started ) {
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75 SDL_TimerQuit();
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76 }
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77 if ( ! SDL_timer_threaded ) {
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78 retval = SDL_SYS_TimerInit();
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79 }
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80 if ( SDL_timer_threaded ) {
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81 SDL_timer_mutex = SDL_CreateMutex();
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82 }
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83 if ( retval == 0 ) {
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84 SDL_timer_started = 1;
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85 }
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86 return(retval);
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87 }
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88
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89 void SDL_TimerQuit(void)
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90 {
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91 SDL_SetTimer(0, NULL);
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92 if ( SDL_timer_threaded < 2 ) {
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93 SDL_SYS_TimerQuit();
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94 }
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95 if ( SDL_timer_threaded ) {
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96 SDL_DestroyMutex(SDL_timer_mutex);
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97 }
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98 SDL_timer_started = 0;
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99 SDL_timer_threaded = 0;
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100 }
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101
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102 void SDL_ThreadedTimerCheck(void)
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103 {
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104 Uint32 now, ms;
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105 SDL_TimerID t, prev, next;
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106 SDL_bool removed;
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107
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108 SDL_mutexP(SDL_timer_mutex);
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109 list_changed = SDL_FALSE;
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110 now = SDL_GetTicks();
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111 for ( prev = NULL, t = SDL_timers; t; t = next ) {
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112 removed = SDL_FALSE;
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113 ms = t->interval - SDL_TIMESLICE;
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114 next = t->next;
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115 if ( (int)(now - t->last_alarm) > (int)ms ) {
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116 struct _SDL_TimerID timer;
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117
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118 if ( (now - t->last_alarm) < t->interval ) {
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119 t->last_alarm += t->interval;
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120 } else {
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121 t->last_alarm = now;
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122 }
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123 #ifdef DEBUG_TIMERS
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124 printf("Executing timer %p (thread = %d)\n",
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125 t, SDL_ThreadID());
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126 #endif
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127 timer = *t;
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128 SDL_mutexV(SDL_timer_mutex);
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129 ms = timer.cb(timer.interval, timer.param);
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130 SDL_mutexP(SDL_timer_mutex);
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131 if ( list_changed ) {
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132 /* Abort, list of timers modified */
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133 /* FIXME: what if ms was changed? */
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134 break;
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135 }
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136 if ( ms != t->interval ) {
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137 if ( ms ) {
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138 t->interval = ROUND_RESOLUTION(ms);
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139 } else {
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140 /* Remove timer from the list */
1
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parents:
diff changeset
141 #ifdef DEBUG_TIMERS
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diff changeset
142 printf("SDL: Removing timer %p\n", t);
cf2af46e9e2a Changes since SDL 1.2.0 release
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parents:
diff changeset
143 #endif
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
144 if ( prev ) {
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
145 prev->next = next;
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
146 } else {
cf2af46e9e2a Changes since SDL 1.2.0 release
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parents:
diff changeset
147 SDL_timers = next;
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
148 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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diff changeset
149 SDL_free(t);
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150 --SDL_timer_running;
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151 removed = SDL_TRUE;
1
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diff changeset
152 }
cf2af46e9e2a Changes since SDL 1.2.0 release
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153 }
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
154 }
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
155 /* Don't update prev if the timer has disappeared */
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
156 if ( ! removed ) {
cf2af46e9e2a Changes since SDL 1.2.0 release
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parents:
diff changeset
157 prev = t;
cf2af46e9e2a Changes since SDL 1.2.0 release
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parents:
diff changeset
158 }
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
159 }
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
160 SDL_mutexV(SDL_timer_mutex);
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
161 }
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
162
1028
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diff changeset
163 static SDL_TimerID SDL_AddTimerInternal(Uint32 interval, SDL_NewTimerCallback callback, void *param)
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parents: 1023
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164 {
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diff changeset
165 SDL_TimerID t;
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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diff changeset
166 t = (SDL_TimerID) SDL_malloc(sizeof(struct _SDL_TimerID));
1028
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167 if ( t ) {
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
168 t->interval = ROUND_RESOLUTION(interval);
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
169 t->cb = callback;
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Sam Lantinga <slouken@libsdl.org>
parents: 1023
diff changeset
170 t->param = param;
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Sam Lantinga <slouken@libsdl.org>
parents: 1023
diff changeset
171 t->last_alarm = SDL_GetTicks();
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
172 t->next = SDL_timers;
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
173 SDL_timers = t;
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
174 ++SDL_timer_running;
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Sam Lantinga <slouken@libsdl.org>
parents: 1023
diff changeset
175 list_changed = SDL_TRUE;
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
176 }
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
177 #ifdef DEBUG_TIMERS
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178 printf("SDL_AddTimer(%d) = %08x num_timers = %d\n", interval, (Uint32)t, SDL_timer_running);
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179 #endif
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180 return t;
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181 }
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182
1
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
183 SDL_TimerID SDL_AddTimer(Uint32 interval, SDL_NewTimerCallback callback, void *param)
cf2af46e9e2a Changes since SDL 1.2.0 release
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parents:
diff changeset
184 {
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
185 SDL_TimerID t;
cf2af46e9e2a Changes since SDL 1.2.0 release
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parents:
diff changeset
186 if ( ! SDL_timer_mutex ) {
cf2af46e9e2a Changes since SDL 1.2.0 release
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parents:
diff changeset
187 if ( SDL_timer_started ) {
cf2af46e9e2a Changes since SDL 1.2.0 release
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parents:
diff changeset
188 SDL_SetError("This platform doesn't support multiple timers");
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
189 } else {
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
190 SDL_SetError("You must call SDL_Init(SDL_INIT_TIMER) first");
cf2af46e9e2a Changes since SDL 1.2.0 release
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parents:
diff changeset
191 }
cf2af46e9e2a Changes since SDL 1.2.0 release
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parents:
diff changeset
192 return NULL;
cf2af46e9e2a Changes since SDL 1.2.0 release
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parents:
diff changeset
193 }
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
194 if ( ! SDL_timer_threaded ) {
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
195 SDL_SetError("Multiple timers require threaded events!");
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
196 return NULL;
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
197 }
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
198 SDL_mutexP(SDL_timer_mutex);
1028
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diff changeset
199 t = SDL_AddTimerInternal(interval, callback, param);
1
cf2af46e9e2a Changes since SDL 1.2.0 release
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200 SDL_mutexV(SDL_timer_mutex);
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
201 return t;
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
202 }
cf2af46e9e2a Changes since SDL 1.2.0 release
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parents:
diff changeset
203
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
204 SDL_bool SDL_RemoveTimer(SDL_TimerID id)
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
205 {
cf2af46e9e2a Changes since SDL 1.2.0 release
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parents:
diff changeset
206 SDL_TimerID t, prev = NULL;
cf2af46e9e2a Changes since SDL 1.2.0 release
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parents:
diff changeset
207 SDL_bool removed;
cf2af46e9e2a Changes since SDL 1.2.0 release
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parents:
diff changeset
208
cf2af46e9e2a Changes since SDL 1.2.0 release
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parents:
diff changeset
209 removed = SDL_FALSE;
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
210 SDL_mutexP(SDL_timer_mutex);
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
211 /* Look for id in the linked list of timers */
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
212 for (t = SDL_timers; t; prev=t, t = t->next ) {
cf2af46e9e2a Changes since SDL 1.2.0 release
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parents:
diff changeset
213 if ( t == id ) {
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
214 if(prev) {
cf2af46e9e2a Changes since SDL 1.2.0 release
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parents:
diff changeset
215 prev->next = t->next;
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
216 } else {
cf2af46e9e2a Changes since SDL 1.2.0 release
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parents:
diff changeset
217 SDL_timers = t->next;
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parents:
diff changeset
218 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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diff changeset
219 SDL_free(t);
1028
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diff changeset
220 --SDL_timer_running;
1
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parents:
diff changeset
221 removed = SDL_TRUE;
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
222 list_changed = SDL_TRUE;
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
223 break;
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
224 }
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
225 }
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
226 #ifdef DEBUG_TIMERS
1028
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diff changeset
227 printf("SDL_RemoveTimer(%08x) = %d num_timers = %d thread = %d\n", (Uint32)id, removed, SDL_timer_running, SDL_ThreadID());
1
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
228 #endif
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
229 SDL_mutexV(SDL_timer_mutex);
cf2af46e9e2a Changes since SDL 1.2.0 release
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parents:
diff changeset
230 return removed;
cf2af46e9e2a Changes since SDL 1.2.0 release
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parents:
diff changeset
231 }
cf2af46e9e2a Changes since SDL 1.2.0 release
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parents:
diff changeset
232
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
233 /* Old style callback functions are wrapped through this */
1190
173c063d4f55 OS/2 port!
Ryan C. Gordon <icculus@icculus.org>
parents: 1117
diff changeset
234 static Uint32 SDLCALL callback_wrapper(Uint32 ms, void *param)
1
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
235 {
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
236 SDL_TimerCallback func = (SDL_TimerCallback) param;
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
237 return (*func)(ms);
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
238 }
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
239
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
240 int SDL_SetTimer(Uint32 ms, SDL_TimerCallback callback)
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
241 {
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
242 int retval;
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
243
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
244 #ifdef DEBUG_TIMERS
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
245 printf("SDL_SetTimer(%d)\n", ms);
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
246 #endif
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
247 retval = 0;
1028
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diff changeset
248
5ba65305c954 Fix various problems with the timer code.
Sam Lantinga <slouken@libsdl.org>
parents: 1023
diff changeset
249 if ( SDL_timer_threaded ) {
5ba65305c954 Fix various problems with the timer code.
Sam Lantinga <slouken@libsdl.org>
parents: 1023
diff changeset
250 SDL_mutexP(SDL_timer_mutex);
5ba65305c954 Fix various problems with the timer code.
Sam Lantinga <slouken@libsdl.org>
parents: 1023
diff changeset
251 }
1
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
252 if ( SDL_timer_running ) { /* Stop any currently running timer */
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
253 if ( SDL_timer_threaded ) {
1028
5ba65305c954 Fix various problems with the timer code.
Sam Lantinga <slouken@libsdl.org>
parents: 1023
diff changeset
254 while ( SDL_timers ) {
5ba65305c954 Fix various problems with the timer code.
Sam Lantinga <slouken@libsdl.org>
parents: 1023
diff changeset
255 SDL_TimerID freeme = SDL_timers;
5ba65305c954 Fix various problems with the timer code.
Sam Lantinga <slouken@libsdl.org>
parents: 1023
diff changeset
256 SDL_timers = SDL_timers->next;
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
257 SDL_free(freeme);
1028
5ba65305c954 Fix various problems with the timer code.
Sam Lantinga <slouken@libsdl.org>
parents: 1023
diff changeset
258 }
5ba65305c954 Fix various problems with the timer code.
Sam Lantinga <slouken@libsdl.org>
parents: 1023
diff changeset
259 SDL_timer_running = 0;
5ba65305c954 Fix various problems with the timer code.
Sam Lantinga <slouken@libsdl.org>
parents: 1023
diff changeset
260 list_changed = SDL_TRUE;
1
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
261 } else {
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
262 SDL_SYS_StopTimer();
1028
5ba65305c954 Fix various problems with the timer code.
Sam Lantinga <slouken@libsdl.org>
parents: 1023
diff changeset
263 SDL_timer_running = 0;
1
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
264 }
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
265 }
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
266 if ( ms ) {
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
267 if ( SDL_timer_threaded ) {
1028
5ba65305c954 Fix various problems with the timer code.
Sam Lantinga <slouken@libsdl.org>
parents: 1023
diff changeset
268 if ( SDL_AddTimerInternal(ms, callback_wrapper, (void *)callback) == NULL ) {
5ba65305c954 Fix various problems with the timer code.
Sam Lantinga <slouken@libsdl.org>
parents: 1023
diff changeset
269 retval = -1;
5ba65305c954 Fix various problems with the timer code.
Sam Lantinga <slouken@libsdl.org>
parents: 1023
diff changeset
270 }
1
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
271 } else {
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
272 SDL_timer_running = 1;
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
273 SDL_alarm_interval = ms;
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
274 SDL_alarm_callback = callback;
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
275 retval = SDL_SYS_StartTimer();
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
276 }
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
277 }
1028
5ba65305c954 Fix various problems with the timer code.
Sam Lantinga <slouken@libsdl.org>
parents: 1023
diff changeset
278 if ( SDL_timer_threaded ) {
1117
95b261f445b1 From: Jim Paris <jim_jtan_com>
Ryan C. Gordon <icculus@icculus.org>
parents: 1028
diff changeset
279 SDL_mutexV(SDL_timer_mutex);
1028
5ba65305c954 Fix various problems with the timer code.
Sam Lantinga <slouken@libsdl.org>
parents: 1023
diff changeset
280 }
5ba65305c954 Fix various problems with the timer code.
Sam Lantinga <slouken@libsdl.org>
parents: 1023
diff changeset
281
1
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
282 return retval;
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
283 }