Mercurial > sdl-ios-xcode
annotate src/timer/SDL_timer.c @ 1668:4da1ee79c9af SDL-1.3
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author | Sam Lantinga <slouken@libsdl.org> |
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date | Mon, 29 May 2006 04:04:35 +0000 |
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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 } |
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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: */ |