Mercurial > sdl-ios-xcode
annotate src/timer/mint/SDL_systimer.c @ 769:b8d311d90021
Updated copyright information for 2004 (Happy New Year!)
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 04 Jan 2004 16:49:27 +0000 |
parents | 623b453a3219 |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
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3 Copyright (C) 1997-2004 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@libsdl.org |
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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 /* |
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29 * TOS/MiNT timer driver |
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30 * based on vbl vector |
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31 * |
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32 * Patrice Mandin |
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33 */ |
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34 |
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35 #include <stdio.h> |
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36 #include <sys/time.h> |
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37 #include <signal.h> |
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38 #include <unistd.h> |
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39 #include <string.h> |
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40 #include <errno.h> |
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41 |
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42 #include <mint/osbind.h> |
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43 #include <mint/sysvars.h> |
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44 |
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45 #include "SDL_error.h" |
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46 #include "SDL_timer.h" |
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47 #include "SDL_timer_c.h" |
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48 #include "SDL_thread.h" |
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49 |
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50 #include "mint/SDL_vbltimer_s.h" |
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51 |
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52 /* The first ticks value of the application */ |
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53 static Uint32 start; |
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54 static SDL_bool supervisor; |
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55 |
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56 void SDL_StartTicks(void) |
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57 { |
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58 void *oldpile; |
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59 |
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60 /* Set first ticks value */ |
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61 oldpile=(void *)Super(0); |
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62 start=*((volatile long *)_hz_200); |
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63 Super(oldpile); |
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64 |
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65 start *= 5; /* One _hz_200 tic is 5ms */ |
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66 } |
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67 |
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68 Uint32 SDL_GetTicks (void) |
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69 { |
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70 Uint32 now; |
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71 void *oldpile; |
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72 |
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73 /* Check if we are in supervisor mode |
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74 (this is the case when called from SDL_ThreadedTimerCheck, |
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75 which is called from RunTimer, running in the vbl vector) |
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76 */ |
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77 if (!supervisor) { |
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78 oldpile=(void *)Super(0); |
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79 } |
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80 |
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81 now=*((volatile long *)_hz_200); |
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82 |
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83 if (!supervisor) { |
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84 Super(oldpile); |
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85 } |
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86 |
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87 return((now*5)-start); |
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88 } |
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89 |
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90 void SDL_Delay (Uint32 ms) |
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91 { |
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92 Uint32 now; |
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93 |
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94 now = SDL_GetTicks(); |
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95 while ((SDL_GetTicks()-now)<ms){ |
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96 } |
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97 } |
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98 |
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99 /* Data to handle a single periodic alarm */ |
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100 static SDL_bool timer_installed=SDL_FALSE; |
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101 |
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102 static void RunTimer(void) |
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103 { |
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104 supervisor=SDL_TRUE; |
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105 SDL_ThreadedTimerCheck(); |
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106 supervisor=SDL_FALSE; |
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107 } |
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108 |
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109 /* This is only called if the event thread is not running */ |
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110 int SDL_SYS_TimerInit(void) |
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111 { |
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112 void *oldpile; |
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113 |
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114 supervisor=SDL_FALSE; |
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115 |
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116 /* Install RunTimer in vbl vector */ |
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117 oldpile=(void *)Super(0); |
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118 timer_installed = !SDL_AtariVblInstall(RunTimer); |
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119 Super(oldpile); |
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120 |
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121 if (!timer_installed) { |
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122 return(-1); |
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123 } |
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124 return(SDL_SetTimerThreaded(0)); |
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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 void *oldpile; |
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130 |
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131 if (timer_installed) { |
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132 /* Uninstall RunTimer vbl vector */ |
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133 oldpile=(void *)Super(0); |
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134 SDL_AtariVblUninstall(RunTimer); |
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135 Super(oldpile); |
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136 timer_installed = SDL_FALSE; |
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137 } |
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138 } |
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139 |
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140 int SDL_SYS_StartTimer(void) |
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141 { |
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142 SDL_SetError("Internal logic error: MiNT uses vbl timer"); |
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143 return(-1); |
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144 } |
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145 |
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146 void SDL_SYS_StopTimer(void) |
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147 { |
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148 return; |
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149 } |