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annotate src/timer/SDL_timer.c @ 5282:8e421890cdb8

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Fixed bug #1117 There's a new event that's always sent when the window changes size, and that event is what the renderers listen for to determine if they need to rebind their context.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 12 Feb 2011 19:02:14 -0800
parents b530ef003506
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) 1997-2011 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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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_atomic.h"
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27 #include "SDL_cpuinfo.h"
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28 #include "SDL_thread.h"
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29
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30 /* #define DEBUG_TIMERS */
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31
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32 typedef struct _SDL_Timer
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33 {
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34 int timerID;
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35 SDL_TimerCallback callback;
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36 void *param;
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37 Uint32 interval;
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38 Uint32 scheduled;
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39 volatile SDL_bool canceled;
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40 struct _SDL_Timer *next;
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41 } SDL_Timer;
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42
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43 typedef struct _SDL_TimerMap
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44 {
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45 int timerID;
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46 SDL_Timer *timer;
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47 struct _SDL_TimerMap *next;
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48 } SDL_TimerMap;
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49
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50 /* The timers are kept in a sorted list */
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51 typedef struct {
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52 /* Data used by the main thread */
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53 SDL_Thread *thread;
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54 SDL_atomic_t nextID;
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55 SDL_TimerMap *timermap;
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56 SDL_mutex *timermap_lock;
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57
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58 /* Padding to separate cache lines between threads */
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59 char cache_pad[SDL_CACHELINE_SIZE];
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60
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61 /* Data used to communicate with the timer thread */
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62 SDL_SpinLock lock;
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63 SDL_sem *sem;
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64 SDL_Timer * volatile pending;
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65 SDL_Timer * volatile freelist;
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66 volatile SDL_bool active;
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67
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68 /* List of timers - this is only touched by the timer thread */
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69 SDL_Timer *timers;
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70 } SDL_TimerData;
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71
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72 static SDL_TimerData SDL_timer_data;
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73
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74
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75 /* The idea here is that any thread might add a timer, but a single
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76 * thread manages the active timer queue, sorted by scheduling time.
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77 *
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78 * Timers are removed by simply setting a canceled flag
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79 */
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80
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81 static void
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82 SDL_AddTimerInternal(SDL_TimerData *data, SDL_Timer *timer)
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83 {
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84 SDL_Timer *prev, *curr;
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85
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86 prev = NULL;
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87 for (curr = data->timers; curr; prev = curr, curr = curr->next) {
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88 if ((Sint32)(timer->scheduled-curr->scheduled) < 0) {
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89 break;
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90 }
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91 }
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92
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93 /* Insert the timer here! */
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94 if (prev) {
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95 prev->next = timer;
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96 } else {
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97 data->timers = timer;
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98 }
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99 timer->next = curr;
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100 }
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101
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102 static int
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103 SDL_TimerThread(void *_data)
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104 {
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105 SDL_TimerData *data = (SDL_TimerData *)_data;
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106 SDL_Timer *pending;
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107 SDL_Timer *current;
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108 SDL_Timer *freelist_head = NULL;
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109 SDL_Timer *freelist_tail = NULL;
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110 Uint32 tick, now, interval, delay;
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111
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112 /* Threaded timer loop:
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113 * 1. Queue timers added by other threads
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114 * 2. Handle any timers that should dispatch this cycle
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115 * 3. Wait until next dispatch time or new timer arrives
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116 */
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117 for ( ; ; ) {
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118 /* Pending and freelist maintenance */
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119 SDL_AtomicLock(&data->lock);
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120 {
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121 /* Get any timers ready to be queued */
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122 pending = data->pending;
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123 data->pending = NULL;
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124
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125 /* Make any unused timer structures available */
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126 if (freelist_head) {
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127 freelist_tail->next = data->freelist;
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128 data->freelist = freelist_head;
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129 }
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130 }
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131 SDL_AtomicUnlock(&data->lock);
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132
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133 /* Sort the pending timers into our list */
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134 while (pending) {
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135 current = pending;
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136 pending = pending->next;
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137 SDL_AddTimerInternal(data, current);
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138 }
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139 freelist_head = NULL;
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140 freelist_tail = NULL;
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141
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142 /* Check to see if we're still running, after maintenance */
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143 if (!data->active) {
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144 break;
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145 }
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146
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147 /* Initial delay if there are no timers */
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148 delay = SDL_MUTEX_MAXWAIT;
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149
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150 tick = SDL_GetTicks();
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151
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152 /* Process all the pending timers for this tick */
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153 while (data->timers) {
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154 current = data->timers;
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155
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156 if ((Sint32)(tick-current->scheduled) < 0) {
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157 /* Scheduled for the future, wait a bit */
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158 delay = (current->scheduled - tick);
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159 break;
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diff changeset
160 }
481dabb098ef Improved timer implementation
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diff changeset
161
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diff changeset
162 /* We're going to do something with this timer */
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diff changeset
163 data->timers = current->next;
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diff changeset
164
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diff changeset
165 if (current->canceled) {
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diff changeset
166 interval = 0;
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diff changeset
167 } else {
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diff changeset
168 interval = current->callback(current->interval, current->param);
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diff changeset
169 }
1
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diff changeset
170
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diff changeset
171 if (interval > 0) {
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diff changeset
172 /* Reschedule this timer */
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diff changeset
173 current->scheduled = tick + interval;
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diff changeset
174 SDL_AddTimerInternal(data, current);
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diff changeset
175 } else {
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diff changeset
176 if (!freelist_head) {
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diff changeset
177 freelist_head = current;
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178 }
481dabb098ef Improved timer implementation
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diff changeset
179 if (freelist_tail) {
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diff changeset
180 freelist_tail->next = current;
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diff changeset
181 }
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diff changeset
182 freelist_tail = current;
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diff changeset
183
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diff changeset
184 current->canceled = SDL_TRUE;
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diff changeset
185 }
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diff changeset
186 }
481dabb098ef Improved timer implementation
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diff changeset
187
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diff changeset
188 /* Adjust the delay based on processing time */
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diff changeset
189 now = SDL_GetTicks();
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diff changeset
190 interval = (now - tick);
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diff changeset
191 if (interval > delay) {
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diff changeset
192 delay = 0;
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diff changeset
193 } else {
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diff changeset
194 delay -= interval;
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195 }
481dabb098ef Improved timer implementation
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diff changeset
196
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diff changeset
197 /* Note that each time a timer is added, this will return
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diff changeset
198 immediately, but we process the timers added all at once.
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199 That's okay, it just means we run through the loop a few
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200 extra times.
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201 */
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202 SDL_SemWaitTimeout(data->sem, delay);
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c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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203 }
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204 return 0;
1
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
205 }
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
206
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diff changeset
207 int
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diff changeset
208 SDL_TimerInit(void)
1
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
209 {
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diff changeset
210 SDL_TimerData *data = &SDL_timer_data;
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diff changeset
211
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diff changeset
212 if (!data->active) {
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diff changeset
213 data->timermap_lock = SDL_CreateMutex();
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diff changeset
214 if (!data->timermap_lock) {
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diff changeset
215 return -1;
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diff changeset
216 }
1
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
217
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481dabb098ef Improved timer implementation
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diff changeset
218 data->sem = SDL_CreateSemaphore(0);
481dabb098ef Improved timer implementation
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diff changeset
219 if (!data->sem) {
481dabb098ef Improved timer implementation
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diff changeset
220 SDL_DestroyMutex(data->timermap_lock);
481dabb098ef Improved timer implementation
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diff changeset
221 return -1;
481dabb098ef Improved timer implementation
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diff changeset
222 }
481dabb098ef Improved timer implementation
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diff changeset
223
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diff changeset
224 data->active = SDL_TRUE;
5116
e337f792c6a7 Fixed compiling under Visual Studio
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diff changeset
225 /* !!! FIXME: this is nasty. */
e337f792c6a7 Fixed compiling under Visual Studio
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diff changeset
226 #if (defined(__WIN32__) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC)
e337f792c6a7 Fixed compiling under Visual Studio
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diff changeset
227 #undef SDL_CreateThread
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diff changeset
228 data->thread = SDL_CreateThread(SDL_TimerThread, data, NULL, NULL);
e337f792c6a7 Fixed compiling under Visual Studio
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diff changeset
229 #else
5113
481dabb098ef Improved timer implementation
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diff changeset
230 data->thread = SDL_CreateThread(SDL_TimerThread, data);
5116
e337f792c6a7 Fixed compiling under Visual Studio
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diff changeset
231 #endif
5113
481dabb098ef Improved timer implementation
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diff changeset
232 if (!data->thread) {
481dabb098ef Improved timer implementation
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diff changeset
233 SDL_TimerQuit();
481dabb098ef Improved timer implementation
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diff changeset
234 return -1;
481dabb098ef Improved timer implementation
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diff changeset
235 }
481dabb098ef Improved timer implementation
Sam Lantinga <slouken@libsdl.org>
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diff changeset
236
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diff changeset
237 SDL_AtomicSet(&data->nextID, 1);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
238 }
5113
481dabb098ef Improved timer implementation
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diff changeset
239 return 0;
1
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
240 }
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
241
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
242 void
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diff changeset
243 SDL_TimerQuit(void)
1
cf2af46e9e2a Changes since SDL 1.2.0 release
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parents:
diff changeset
244 {
5113
481dabb098ef Improved timer implementation
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diff changeset
245 SDL_TimerData *data = &SDL_timer_data;
481dabb098ef Improved timer implementation
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diff changeset
246 SDL_Timer *timer;
481dabb098ef Improved timer implementation
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diff changeset
247 SDL_TimerMap *entry;
481dabb098ef Improved timer implementation
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diff changeset
248
481dabb098ef Improved timer implementation
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diff changeset
249 if (data->active) {
481dabb098ef Improved timer implementation
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diff changeset
250 data->active = SDL_FALSE;
1
cf2af46e9e2a Changes since SDL 1.2.0 release
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diff changeset
251
5113
481dabb098ef Improved timer implementation
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diff changeset
252 /* Shutdown the timer thread */
481dabb098ef Improved timer implementation
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diff changeset
253 if (data->thread) {
481dabb098ef Improved timer implementation
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diff changeset
254 SDL_SemPost(data->sem);
481dabb098ef Improved timer implementation
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diff changeset
255 SDL_WaitThread(data->thread, NULL);
481dabb098ef Improved timer implementation
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diff changeset
256 data->thread = NULL;
481dabb098ef Improved timer implementation
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diff changeset
257 }
5074
906d7293bb47 Fixed bug in timer when the list of timers changed.
Sam Lantinga <slouken@libsdl.org>
parents: 3697
diff changeset
258
5113
481dabb098ef Improved timer implementation
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diff changeset
259 SDL_DestroySemaphore(data->sem);
481dabb098ef Improved timer implementation
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diff changeset
260 data->sem = NULL;
1028
5ba65305c954 Fix various problems with the timer code.
Sam Lantinga <slouken@libsdl.org>
parents: 1023
diff changeset
261
5113
481dabb098ef Improved timer implementation
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diff changeset
262 /* Clean up the timer entries */
481dabb098ef Improved timer implementation
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parents: 5074
diff changeset
263 while (data->timers) {
481dabb098ef Improved timer implementation
Sam Lantinga <slouken@libsdl.org>
parents: 5074
diff changeset
264 timer = data->timers;
481dabb098ef Improved timer implementation
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parents: 5074
diff changeset
265 data->timers = timer->next;
481dabb098ef Improved timer implementation
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parents: 5074
diff changeset
266 SDL_free(timer);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
267 }
5113
481dabb098ef Improved timer implementation
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diff changeset
268 while (data->freelist) {
481dabb098ef Improved timer implementation
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diff changeset
269 timer = data->freelist;
481dabb098ef Improved timer implementation
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parents: 5074
diff changeset
270 data->freelist = timer->next;
481dabb098ef Improved timer implementation
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parents: 5074
diff changeset
271 SDL_free(timer);
481dabb098ef Improved timer implementation
Sam Lantinga <slouken@libsdl.org>
parents: 5074
diff changeset
272 }
481dabb098ef Improved timer implementation
Sam Lantinga <slouken@libsdl.org>
parents: 5074
diff changeset
273 while (data->timermap) {
481dabb098ef Improved timer implementation
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parents: 5074
diff changeset
274 entry = data->timermap;
481dabb098ef Improved timer implementation
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diff changeset
275 data->timermap = entry->next;
481dabb098ef Improved timer implementation
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parents: 5074
diff changeset
276 SDL_free(entry);
481dabb098ef Improved timer implementation
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diff changeset
277 }
1
cf2af46e9e2a Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
278
5113
481dabb098ef Improved timer implementation
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diff changeset
279 SDL_DestroyMutex(data->timermap_lock);
481dabb098ef Improved timer implementation
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diff changeset
280 data->timermap_lock = NULL;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1788
diff changeset
281 }
1028
5ba65305c954 Fix various problems with the timer code.
Sam Lantinga <slouken@libsdl.org>
parents: 1023
diff changeset
282 }
5ba65305c954 Fix various problems with the timer code.
Sam Lantinga <slouken@libsdl.org>
parents: 1023
diff changeset
283
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
284 SDL_TimerID
5113
481dabb098ef Improved timer implementation
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diff changeset
285 SDL_AddTimer(Uint32 interval, SDL_TimerCallback callback, void *param)
1
cf2af46e9e2a Changes since SDL 1.2.0 release
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parents:
diff changeset
286 {
5113
481dabb098ef Improved timer implementation
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diff changeset
287 SDL_TimerData *data = &SDL_timer_data;
481dabb098ef Improved timer implementation
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diff changeset
288 SDL_Timer *timer;
481dabb098ef Improved timer implementation
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diff changeset
289 SDL_TimerMap *entry;
481dabb098ef Improved timer implementation
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diff changeset
290
481dabb098ef Improved timer implementation
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diff changeset
291 if (!data->active) {
481dabb098ef Improved timer implementation
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diff changeset
292 int status = 0;
481dabb098ef Improved timer implementation
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diff changeset
293
481dabb098ef Improved timer implementation
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diff changeset
294 SDL_AtomicLock(&data->lock);
481dabb098ef Improved timer implementation
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diff changeset
295 if (!data->active) {
481dabb098ef Improved timer implementation
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parents: 5074
diff changeset
296 status = SDL_TimerInit();
481dabb098ef Improved timer implementation
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diff changeset
297 }
481dabb098ef Improved timer implementation
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diff changeset
298 SDL_AtomicUnlock(&data->lock);
481dabb098ef Improved timer implementation
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parents: 5074
diff changeset
299
481dabb098ef Improved timer implementation
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parents: 5074
diff changeset
300 if (status < 0) {
481dabb098ef Improved timer implementation
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diff changeset
301 return 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
302 }
5113
481dabb098ef Improved timer implementation
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diff changeset
303 }
481dabb098ef Improved timer implementation
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diff changeset
304
481dabb098ef Improved timer implementation
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parents: 5074
diff changeset
305 SDL_AtomicLock(&data->lock);
481dabb098ef Improved timer implementation
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parents: 5074
diff changeset
306 timer = data->freelist;
481dabb098ef Improved timer implementation
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parents: 5074
diff changeset
307 if (timer) {
481dabb098ef Improved timer implementation
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parents: 5074
diff changeset
308 data->freelist = timer->next;
481dabb098ef Improved timer implementation
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diff changeset
309 }
481dabb098ef Improved timer implementation
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diff changeset
310 SDL_AtomicUnlock(&data->lock);
481dabb098ef Improved timer implementation
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diff changeset
311
481dabb098ef Improved timer implementation
Sam Lantinga <slouken@libsdl.org>
parents: 5074
diff changeset
312 if (timer) {
481dabb098ef Improved timer implementation
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parents: 5074
diff changeset
313 SDL_RemoveTimer(timer->timerID);
481dabb098ef Improved timer implementation
Sam Lantinga <slouken@libsdl.org>
parents: 5074
diff changeset
314 } else {
481dabb098ef Improved timer implementation
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parents: 5074
diff changeset
315 timer = (SDL_Timer *)SDL_malloc(sizeof(*timer));
481dabb098ef Improved timer implementation
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parents: 5074
diff changeset
316 if (!timer) {
481dabb098ef Improved timer implementation
Sam Lantinga <slouken@libsdl.org>
parents: 5074
diff changeset
317 SDL_OutOfMemory();
481dabb098ef Improved timer implementation
Sam Lantinga <slouken@libsdl.org>
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diff changeset
318 return 0;
481dabb098ef Improved timer implementation
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diff changeset
319 }
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
320 }
5113
481dabb098ef Improved timer implementation
Sam Lantinga <slouken@libsdl.org>
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diff changeset
321 timer->timerID = SDL_AtomicIncRef(&data->nextID);
481dabb098ef Improved timer implementation
Sam Lantinga <slouken@libsdl.org>
parents: 5074
diff changeset
322 timer->callback = callback;
481dabb098ef Improved timer implementation
Sam Lantinga <slouken@libsdl.org>
parents: 5074
diff changeset
323 timer->param = param;
481dabb098ef Improved timer implementation
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324 timer->interval = interval;
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325 timer->scheduled = SDL_GetTicks() + interval;
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326 timer->canceled = SDL_FALSE;
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327
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328 entry = (SDL_TimerMap *)SDL_malloc(sizeof(*entry));
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329 if (!entry) {
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330 SDL_free(timer);
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331 SDL_OutOfMemory();
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332 return 0;
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333 }
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334 entry->timer = timer;
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335 entry->timerID = timer->timerID;
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336
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337 SDL_mutexP(data->timermap_lock);
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338 entry->next = data->timermap;
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339 data->timermap = entry;
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340 SDL_mutexV(data->timermap_lock);
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341
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342 /* Add the timer to the pending list for the timer thread */
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343 SDL_AtomicLock(&data->lock);
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344 timer->next = data->pending;
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345 data->pending = timer;
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346 SDL_AtomicUnlock(&data->lock);
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347
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348 /* Wake up the timer thread if necessary */
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349 SDL_SemPost(data->sem);
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350
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351 return entry->timerID;
1
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352 }
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353
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354 SDL_bool
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355 SDL_RemoveTimer(SDL_TimerID id)
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356 {
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357 SDL_TimerData *data = &SDL_timer_data;
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358 SDL_TimerMap *prev, *entry;
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359 SDL_bool canceled = SDL_FALSE;
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360
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361 /* Find the timer */
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362 SDL_mutexP(data->timermap_lock);
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363 prev = NULL;
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364 for (entry = data->timermap; entry; prev = entry, entry = entry->next) {
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365 if (entry->timerID == id) {
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366 if (prev) {
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367 prev->next = entry->next;
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368 } else {
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369 data->timermap = entry->next;
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370 }
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371 break;
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372 }
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373 }
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374 SDL_mutexV(data->timermap_lock);
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375
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376 if (entry) {
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377 if (!entry->timer->canceled) {
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378 entry->timer->canceled = SDL_TRUE;
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379 canceled = SDL_TRUE;
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380 }
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381 SDL_free(entry);
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382 }
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383 return canceled;
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384 }
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385
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386 /* vi: set ts=4 sw=4 expandtab: */