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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@devolution.com
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 #include <stdio.h>
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29 #include <sys/time.h>
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30 #include <signal.h>
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31 #include <unistd.h>
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32 #include <string.h>
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33 #include <errno.h>
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34
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35 #include "SDL_error.h"
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36 #include "SDL_timer.h"
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37 #include "SDL_timer_c.h"
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38
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39 /* The first ticks value of the application */
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40 static struct timeval start;
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41
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42 void SDL_StartTicks(void)
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43 {
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44 /* Set first ticks value */
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45 gettimeofday(&start, NULL);
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46 }
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47
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48 Uint32 SDL_GetTicks (void)
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49 {
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50 struct timeval now;
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51 Uint32 ticks;
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52
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53 gettimeofday(&now, NULL);
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54 ticks=(now.tv_sec-start.tv_sec)*1000+(now.tv_usec-start.tv_usec)/1000;
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55 return(ticks);
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56 }
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57
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58 void SDL_Delay (Uint32 ms)
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59 {
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60 int was_error;
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61 #ifndef linux /* Non-Linux implementations need to calculate time left */
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62 Uint32 then, now, elapsed;
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63 #endif
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64 struct timeval tv;
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65
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66 /* Set the timeout interval - Linux only needs to do this once */
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67 #ifdef linux
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68 tv.tv_sec = ms/1000;
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69 tv.tv_usec = (ms%1000)*1000;
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70 #else
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71 then = SDL_GetTicks();
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72 #endif
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73 do {
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74 errno = 0;
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75 #ifndef linux
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76 /* Calculate the time interval left (in case of interrupt) */
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77 now = SDL_GetTicks();
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78 elapsed = (now-then);
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79 then = now;
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80 if ( elapsed >= ms ) {
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81 break;
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82 }
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83 ms -= elapsed;
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84 tv.tv_sec = ms/1000;
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85 tv.tv_usec = (ms%1000)*1000;
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86 #endif
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87 was_error = select(0, NULL, NULL, NULL, &tv);
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88 } while ( was_error && (errno == EINTR) );
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89 }
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90
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91 #include "SDL_thread.h"
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92
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93 /* Data to handle a single periodic alarm */
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94 static int timer_alive = 0;
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95 static SDL_Thread *timer = NULL;
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96
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97 static int RunTimer(void *unused)
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98 {
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99 while ( timer_alive ) {
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100 if ( SDL_timer_running ) {
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101 SDL_ThreadedTimerCheck();
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102 }
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103 SDL_Delay(1);
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104 }
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105 return(0);
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106 }
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107
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108 /* This is only called if the event thread is not running */
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109 int SDL_SYS_TimerInit(void)
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110 {
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111 #ifdef NO_AMIGADEBUG
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112 fprintf(stderr,"Creo il thread per il timer (NOITMER)...\n");
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113 #endif
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114 timer_alive = 1;
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115 timer = SDL_CreateThread(RunTimer, NULL);
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116 if ( timer == NULL )
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117 {
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118 #ifdef NO_AMIGADEBUG
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119 fprintf(stderr,"Creazione del thread fallita...\n");
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120 #endif
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121
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122 return(-1);
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123 }
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124 return(SDL_SetTimerThreaded(1));
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125 }
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126
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127 void SDL_SYS_TimerQuit(void)
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128 {
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129 timer_alive = 0;
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130 if ( timer ) {
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131 SDL_WaitThread(timer, NULL);
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132 timer = NULL;
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133 }
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134 }
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135
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136 int SDL_SYS_StartTimer(void)
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137 {
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138 SDL_SetError("Internal logic error: Linux uses threaded timer");
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139 return(-1);
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140 }
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141
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142 void SDL_SYS_StopTimer(void)
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143 {
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144 return;
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145 }
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