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annotate src/timer/SDL_timer.c @ 1734:f7c667ded87d SDL-1.3

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The general code handles restoring video mode/gamma/etc. when the window loses focus. Support for changing fullscreen/windowed mode in progress.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 09 Jul 2006 18:09:16 +0000
parents 4da1ee79c9af
children
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 #include "SDL_config.h"
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23
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24 #include "SDL_timer.h"
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25 #include "SDL_timer_c.h"
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26 #include "SDL_mutex.h"
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27 #include "SDL_systimer.h"
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28
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29 /* #define DEBUG_TIMERS */
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30
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31 int SDL_timer_started = 0;
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32 int SDL_timer_running = 0;
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33
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34 /* Data to handle a single periodic alarm */
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35 Uint32 SDL_alarm_interval = 0;
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36 SDL_TimerCallback SDL_alarm_callback;
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37
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38 /* Data used for a thread-based timer */
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39 static int SDL_timer_threaded = 0;
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40
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41 struct _SDL_TimerID
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42 {
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43 Uint32 interval;
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44 SDL_NewTimerCallback cb;
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45 void *param;
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46 Uint32 last_alarm;
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47 struct _SDL_TimerID *next;
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48 };
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49
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50 static SDL_TimerID SDL_timers = NULL;
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51 static SDL_mutex *SDL_timer_mutex;
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52 static volatile SDL_bool list_changed = SDL_FALSE;
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53
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54 /* Set whether or not the timer should use a thread.
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55 This should not be called while the timer subsystem is running.
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56 */
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57 int
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58 SDL_SetTimerThreaded(int value)
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59 {
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60 int retval;
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61
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62 if (SDL_timer_started) {
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63 SDL_SetError("Timer already initialized");
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64 retval = -1;
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65 } else {
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66 retval = 0;
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67 SDL_timer_threaded = value;
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68 }
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69 return retval;
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70 }
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71
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72 int
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73 SDL_TimerInit(void)
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74 {
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75 int retval;
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76
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77 retval = 0;
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78 if (SDL_timer_started) {
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79 SDL_TimerQuit();
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80 }
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81 if (!SDL_timer_threaded) {
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82 retval = SDL_SYS_TimerInit();
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83 }
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84 if (SDL_timer_threaded) {
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85 SDL_timer_mutex = SDL_CreateMutex();
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86 }
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87 if (retval == 0) {
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88 SDL_timer_started = 1;
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89 }
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90 return (retval);
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91 }
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92
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93 void
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94 SDL_TimerQuit(void)
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95 {
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96 SDL_SetTimer(0, NULL);
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97 if (SDL_timer_threaded < 2) {
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98 SDL_SYS_TimerQuit();
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99 }
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100 if (SDL_timer_threaded) {
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101 SDL_DestroyMutex(SDL_timer_mutex);
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102 SDL_timer_mutex = NULL;
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103 }
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104 SDL_timer_started = 0;
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105 SDL_timer_threaded = 0;
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106 }
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107
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108 void
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109 SDL_ThreadedTimerCheck(void)
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110 {
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111 Uint32 now, ms;
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112 SDL_TimerID t, prev, next;
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113 SDL_bool removed;
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114
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115 SDL_mutexP(SDL_timer_mutex);
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116 list_changed = SDL_FALSE;
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117 now = SDL_GetTicks();
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118 for (prev = NULL, t = SDL_timers; t; t = next) {
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119 removed = SDL_FALSE;
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120 ms = t->interval - SDL_TIMESLICE;
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121 next = t->next;
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122 if ((int) (now - t->last_alarm) > (int) ms) {
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123 struct _SDL_TimerID timer;
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124
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125 if ((now - t->last_alarm) < t->interval) {
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126 t->last_alarm += t->interval;
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127 } else {
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128 t->last_alarm = now;
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129 }
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130 #ifdef DEBUG_TIMERS
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131 printf("Executing timer %p (thread = %d)\n", t, SDL_ThreadID());
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132 #endif
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133 timer = *t;
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134 SDL_mutexV(SDL_timer_mutex);
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135 ms = timer.cb(timer.interval, timer.param);
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136 SDL_mutexP(SDL_timer_mutex);
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137 if (list_changed) {
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138 /* Abort, list of timers modified */
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139 /* FIXME: what if ms was changed? */
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140 break;
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141 }
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142 if (ms != t->interval) {
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143 if (ms) {
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144 t->interval = ROUND_RESOLUTION(ms);
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145 } else {
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146 /* Remove timer from the list */
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147 #ifdef DEBUG_TIMERS
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148 printf("SDL: Removing timer %p\n", t);
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149 #endif
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150 if (prev) {
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151 prev->next = next;
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152 } else {
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153 SDL_timers = next;
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154 }
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155 SDL_free(t);
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156 --SDL_timer_running;
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157 removed = SDL_TRUE;
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158 }
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159 }
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160 }
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161 /* Don't update prev if the timer has disappeared */
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162 if (!removed) {
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163 prev = t;
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164 }
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165 }
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166 SDL_mutexV(SDL_timer_mutex);
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167 }
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168
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169 static SDL_TimerID
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170 SDL_AddTimerInternal(Uint32 interval, SDL_NewTimerCallback callback,
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171 void *param)
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172 {
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173 SDL_TimerID t;
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174 t = (SDL_TimerID) SDL_malloc(sizeof(struct _SDL_TimerID));
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175 if (t) {
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176 t->interval = ROUND_RESOLUTION(interval);
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177 t->cb = callback;
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178 t->param = param;
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179 t->last_alarm = SDL_GetTicks();
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180 t->next = SDL_timers;
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181 SDL_timers = t;
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182 ++SDL_timer_running;
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183 list_changed = SDL_TRUE;
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184 }
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185 #ifdef DEBUG_TIMERS
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186 printf("SDL_AddTimer(%d) = %08x num_timers = %d\n", interval, (Uint32) t,
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187 SDL_timer_running);
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188 #endif
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189 return t;
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190 }
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191
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192 SDL_TimerID
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193 SDL_AddTimer(Uint32 interval, SDL_NewTimerCallback callback, void *param)
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194 {
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195 SDL_TimerID t;
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196 if (!SDL_timer_mutex) {
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197 if (SDL_timer_started) {
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198 SDL_SetError("This platform doesn't support multiple timers");
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199 } else {
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200 SDL_SetError("You must call SDL_Init(SDL_INIT_TIMER) first");
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201 }
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202 return NULL;
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203 }
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204 if (!SDL_timer_threaded) {
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205 SDL_SetError("Multiple timers require threaded events!");
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206 return NULL;
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207 }
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208 SDL_mutexP(SDL_timer_mutex);
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209 t = SDL_AddTimerInternal(interval, callback, param);
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210 SDL_mutexV(SDL_timer_mutex);
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211 return t;
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212 }
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213
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214 SDL_bool
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215 SDL_RemoveTimer(SDL_TimerID id)
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216 {
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217 SDL_TimerID t, prev = NULL;
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218 SDL_bool removed;
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219
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220 removed = SDL_FALSE;
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221 SDL_mutexP(SDL_timer_mutex);
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222 /* Look for id in the linked list of timers */
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223 for (t = SDL_timers; t; prev = t, t = t->next) {
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224 if (t == id) {
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225 if (prev) {
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226 prev->next = t->next;
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227 } else {
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228 SDL_timers = t->next;
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229 }
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230 SDL_free(t);
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231 --SDL_timer_running;
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232 removed = SDL_TRUE;
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233 list_changed = SDL_TRUE;
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234 break;
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235 }
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236 }
1
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237 #ifdef DEBUG_TIMERS
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238 printf("SDL_RemoveTimer(%08x) = %d num_timers = %d thread = %d\n",
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239 (Uint32) id, removed, SDL_timer_running, SDL_ThreadID());
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240 #endif
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241 SDL_mutexV(SDL_timer_mutex);
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242 return removed;
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243 }
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244
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245 /* Old style callback functions are wrapped through this */
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246 static Uint32 SDLCALL
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247 callback_wrapper(Uint32 ms, void *param)
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248 {
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249 SDL_TimerCallback func = (SDL_TimerCallback) param;
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250 return (*func) (ms);
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251 }
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252
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253 int
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254 SDL_SetTimer(Uint32 ms, SDL_TimerCallback callback)
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255 {
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256 int retval;
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257
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258 #ifdef DEBUG_TIMERS
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259 printf("SDL_SetTimer(%d)\n", ms);
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260 #endif
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261 retval = 0;
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262
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263 if (SDL_timer_threaded) {
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264 SDL_mutexP(SDL_timer_mutex);
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265 }
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266 if (SDL_timer_running) { /* Stop any currently running timer */
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267 if (SDL_timer_threaded) {
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268 while (SDL_timers) {
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269 SDL_TimerID freeme = SDL_timers;
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270 SDL_timers = SDL_timers->next;
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271 SDL_free(freeme);
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272 }
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273 SDL_timer_running = 0;
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274 list_changed = SDL_TRUE;
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275 } else {
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276 SDL_SYS_StopTimer();
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277 SDL_timer_running = 0;
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278 }
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279 }
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280 if (ms) {
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281 if (SDL_timer_threaded) {
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282 if (SDL_AddTimerInternal
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283 (ms, callback_wrapper, (void *) callback) == NULL) {
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284 retval = -1;
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285 }
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286 } else {
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287 SDL_timer_running = 1;
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288 SDL_alarm_interval = ms;
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289 SDL_alarm_callback = callback;
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290 retval = SDL_SYS_StartTimer();
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291 }
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292 }
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293 if (SDL_timer_threaded) {
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294 SDL_mutexV(SDL_timer_mutex);
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295 }
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296
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297 return retval;
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298 }
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299
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300 /* vi: set ts=4 sw=4 expandtab: */