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annotate src/timer/os2/SDL_systimer.c @ 1895:c121d94672cb

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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 10 Jul 2006 21:04:37 +0000
parents d5d3a6fe05a1
children 5f6550e5184f
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 #ifdef SDL_TIMER_OS2
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25
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26 #define INCL_DOSMISC
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27 #define INCL_DOSERRORS
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28 #define INCL_DOSSEMAPHORES
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29 #define INCL_DOSDATETIME
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30 #define INCL_DOSPROCESS
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31 #define INCL_DOSPROFILE
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32 #define INCL_DOSEXCEPTIONS
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33 #include <os2.h>
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34
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35 #include "SDL_thread.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
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40 #define TIME_WRAP_VALUE (~(DWORD)0)
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41
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42 /* The first high-resolution ticks value of the application */
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43 static long long hires_start_ticks;
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44 /* The number of ticks per second of the high-resolution performance counter */
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45 static ULONG hires_ticks_per_second;
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46
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47 void
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48 SDL_StartTicks(void)
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49 {
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50 DosTmrQueryFreq(&hires_ticks_per_second);
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51 DosTmrQueryTime((PQWORD) & hires_start_ticks);
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52 }
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53
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54 DECLSPEC Uint32 SDLCALL
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55 SDL_GetTicks(void)
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56 {
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57 long long hires_now;
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58 ULONG ticks = ticks;
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59
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60 DosTmrQueryTime((PQWORD) & hires_now);
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61 /*
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62 hires_now -= hires_start_ticks;
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63 hires_now *= 1000;
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64 hires_now /= hires_ticks_per_second;
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65 */
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66 /* inline asm to avoid runtime inclusion */
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67 _asm {
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68 push edx
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69 push eax
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70 mov eax, dword ptr hires_now
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71 mov edx, dword ptr hires_now + 4
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72 sub eax, dword ptr hires_start_ticks
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73 sbb edx, dword ptr hires_start_ticks + 4
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74 mov ebx, 1000
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75 mov ecx, edx
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76 mul ebx
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77 push eax
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78 push edx
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79 mov eax, ecx
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80 mul ebx
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81 pop eax
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82 add edx, eax
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83 pop eax
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84 mov ebx, dword ptr hires_ticks_per_second
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85 div ebx mov dword ptr ticks, eax pop edx pop eax}
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86
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87 return ticks;
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88
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89 }
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90
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91 /* High resolution sleep, originally made by Ilya Zakharevich */
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92 DECLSPEC void SDLCALL
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93 SDL_Delay(Uint32 ms)
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94 {
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95 /* This is similar to DosSleep(), but has 8ms granularity in time-critical
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96 threads even on Warp3. */
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97 HEV hevEvent1 = 0; /* Event semaphore handle */
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98 HTIMER htimerEvent1 = 0; /* Timer handle */
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99 APIRET rc = NO_ERROR; /* Return code */
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100 int ret = 1;
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101 ULONG priority = 0, nesting; /* Shut down the warnings */
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102 PPIB pib;
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103 PTIB tib;
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104 char *e = NULL;
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105 APIRET badrc;
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106 int switch_priority = 50;
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107
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108 DosCreateEventSem(NULL, /* Unnamed */
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109 &hevEvent1, /* Handle of semaphore returned */
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110 DC_SEM_SHARED, /* Shared needed for DosAsyncTimer */
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111 FALSE); /* Semaphore is in RESET state */
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112
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113 if (ms >= switch_priority)
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114 switch_priority = 0;
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115 if (switch_priority) {
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116 if (DosGetInfoBlocks(&tib, &pib) != NO_ERROR)
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117 switch_priority = 0;
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118 else {
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119 /* In Warp3, to switch scheduling to 8ms step, one needs to do
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120 DosAsyncTimer() in time-critical thread. On laters versions,
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121 more and more cases of wait-for-something are covered.
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122
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123 It turns out that on Warp3fp42 it is the priority at the time
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124 of DosAsyncTimer() which matters. Let's hope that this works
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125 with later versions too... XXXX
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126 */
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127 priority = (tib->tib_ptib2->tib2_ulpri);
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128 if ((priority & 0xFF00) == 0x0300) /* already time-critical */
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129 switch_priority = 0;
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130 /* Make us time-critical. Just modifying TIB is not enough... */
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131 /* tib->tib_ptib2->tib2_ulpri = 0x0300; */
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132 /* We do not want to run at high priority if a signal causes us
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133 to longjmp() out of this section... */
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134 if (DosEnterMustComplete(&nesting))
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135 switch_priority = 0;
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136 else
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137 DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0);
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138 }
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139 }
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140
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141 if ((badrc = DosAsyncTimer(ms, (HSEM) hevEvent1, /* Semaphore to post */
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142 &htimerEvent1))) /* Timer handler (returned) */
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143 e = "DosAsyncTimer";
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144
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145 if (switch_priority && tib->tib_ptib2->tib2_ulpri == 0x0300) {
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146 /* Nobody switched priority while we slept... Ignore errors... */
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147 /* tib->tib_ptib2->tib2_ulpri = priority; *//* Get back... */
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148 if (!
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149 (rc = DosSetPriority(PRTYS_THREAD, (priority >> 8) & 0xFF, 0, 0)))
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150 rc = DosSetPriority(PRTYS_THREAD, 0, priority & 0xFF, 0);
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151 }
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152 if (switch_priority)
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153 rc = DosExitMustComplete(&nesting); /* Ignore errors */
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154
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155 /* The actual blocking call is made with "normal" priority. This way we
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156 should not bother with DosSleep(0) etc. to compensate for us interrupting
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157 higher-priority threads. The goal is to prohibit the system spending too
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158 much time halt()ing, not to run us "no matter what". */
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159 if (!e) /* Wait for AsyncTimer event */
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160 badrc = DosWaitEventSem(hevEvent1, SEM_INDEFINITE_WAIT);
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161
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162 if (e); /* Do nothing */
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163 else if (badrc == ERROR_INTERRUPT)
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164 ret = 0;
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165 else if (badrc)
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166 e = "DosWaitEventSem";
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167 if ((rc = DosCloseEventSem(hevEvent1)) && !e) { /* Get rid of semaphore */
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168 e = "DosCloseEventSem";
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169 badrc = rc;
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170 }
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171 if (e) {
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172 SDL_SetError("[SDL_Delay] : Had error in %s(), rc is 0x%x\n", e,
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173 badrc);
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174 }
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175 }
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176
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177 /* Data to handle a single periodic alarm */
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178 static int timer_alive = 0;
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179 static SDL_Thread *timer = NULL;
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180
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181 static int
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182 RunTimer(void *unused)
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183 {
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184 DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0);
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185 while (timer_alive) {
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186 if (SDL_timer_running) {
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187 SDL_ThreadedTimerCheck();
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188 }
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189 SDL_Delay(10);
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190 }
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191 return (0);
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192 }
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193
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194 /* This is only called if the event thread is not running */
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195 int
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196 SDL_SYS_TimerInit(void)
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197 {
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198 timer_alive = 1;
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199 timer = SDL_CreateThread(RunTimer, NULL);
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200 if (timer == NULL)
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201 return (-1);
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202 return (SDL_SetTimerThreaded(1));
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203 }
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204
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205 void
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206 SDL_SYS_TimerQuit(void)
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207 {
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208 timer_alive = 0;
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209 if (timer) {
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210 SDL_WaitThread(timer, NULL);
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211 timer = NULL;
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212 }
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213 }
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214
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215 int
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216 SDL_SYS_StartTimer(void)
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217 {
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218 SDL_SetError("Internal logic error: OS/2 uses threaded timer");
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219 return (-1);
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220 }
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221
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222 void
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223 SDL_SYS_StopTimer(void)
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224 {
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225 return;
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226 }
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227
1635
92947e3a18db Make sure code is only compiled if the appropriate subsystem is enabled
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228 #endif /* SDL_TIMER_OS2 */
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229 /* vi: set ts=4 sw=4 expandtab: */