annotate src/timer/os2/SDL_systimer.c @ 1850:d5d3a6fe05a1

Fixed thread callback calling conventions, updated OS/2 DLL name to SDL12.dll
author Sam Lantinga <slouken@libsdl.org>
date Wed, 17 May 2006 18:57:04 +0000
parents 92947e3a18db
children c121d94672cb a1b03ba2fcd0
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 SDL_StartTicks(void)
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48 {
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49 DosTmrQueryFreq(&hires_ticks_per_second);
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50 DosTmrQueryTime((PQWORD)&hires_start_ticks);
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51 }
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52
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53 DECLSPEC Uint32 SDLCALL SDL_GetTicks(void)
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54 {
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55 long long hires_now;
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56 ULONG ticks = ticks;
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57
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58 DosTmrQueryTime((PQWORD)&hires_now);
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59 /*
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60 hires_now -= hires_start_ticks;
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61 hires_now *= 1000;
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62 hires_now /= hires_ticks_per_second;
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63 */
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64 /* inline asm to avoid runtime inclusion */
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65 _asm {
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66 push edx
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67 push eax
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68 mov eax, dword ptr hires_now
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69 mov edx, dword ptr hires_now+4
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70 sub eax, dword ptr hires_start_ticks
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71 sbb edx, dword ptr hires_start_ticks+4
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72 mov ebx,1000
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73 mov ecx,edx
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74 mul ebx
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75 push eax
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76 push edx
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77 mov eax,ecx
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78 mul ebx
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79 pop eax
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80 add edx,eax
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81 pop eax
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82 mov ebx, dword ptr hires_ticks_per_second
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83 div ebx
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84 mov dword ptr ticks, eax
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85 pop edx
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86 pop eax
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87 }
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88
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89 return ticks;
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90
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91 }
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92
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93 /* High resolution sleep, originally made by Ilya Zakharevich */
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94 DECLSPEC void SDLCALL SDL_Delay(Uint32 ms)
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95 {
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96 /* This is similar to DosSleep(), but has 8ms granularity in time-critical
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97 threads even on Warp3. */
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98 HEV hevEvent1 = 0; /* Event semaphore handle */
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99 HTIMER htimerEvent1 = 0; /* Timer handle */
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100 APIRET rc = NO_ERROR; /* Return code */
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101 int ret = 1;
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102 ULONG priority = 0, nesting; /* Shut down the warnings */
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103 PPIB pib;
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104 PTIB tib;
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105 char *e = NULL;
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106 APIRET badrc;
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107 int switch_priority = 50;
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108
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109 DosCreateEventSem(NULL, /* Unnamed */
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110 &hevEvent1, /* Handle of semaphore returned */
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111 DC_SEM_SHARED, /* Shared needed for DosAsyncTimer */
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112 FALSE); /* Semaphore is in RESET state */
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113
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114 if (ms >= switch_priority)
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115 switch_priority = 0;
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116 if (switch_priority)
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117 {
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118 if (DosGetInfoBlocks(&tib, &pib)!=NO_ERROR)
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119 switch_priority = 0;
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120 else
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121 {
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122 /* In Warp3, to switch scheduling to 8ms step, one needs to do
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123 DosAsyncTimer() in time-critical thread. On laters versions,
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124 more and more cases of wait-for-something are covered.
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125
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126 It turns out that on Warp3fp42 it is the priority at the time
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127 of DosAsyncTimer() which matters. Let's hope that this works
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128 with later versions too... XXXX
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129 */
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130 priority = (tib->tib_ptib2->tib2_ulpri);
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131 if ((priority & 0xFF00) == 0x0300) /* already time-critical */
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132 switch_priority = 0;
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133 /* Make us time-critical. Just modifying TIB is not enough... */
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134 /* tib->tib_ptib2->tib2_ulpri = 0x0300;*/
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135 /* We do not want to run at high priority if a signal causes us
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136 to longjmp() out of this section... */
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137 if (DosEnterMustComplete(&nesting))
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138 switch_priority = 0;
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139 else
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140 DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0);
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141 }
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142 }
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143
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144 if ((badrc = DosAsyncTimer(ms,
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145 (HSEM) hevEvent1, /* Semaphore to post */
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146 &htimerEvent1))) /* Timer handler (returned) */
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147 e = "DosAsyncTimer";
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148
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149 if (switch_priority && tib->tib_ptib2->tib2_ulpri == 0x0300)
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150 {
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151 /* Nobody switched priority while we slept... Ignore errors... */
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152 /* tib->tib_ptib2->tib2_ulpri = priority; */ /* Get back... */
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153 if (!(rc = DosSetPriority(PRTYS_THREAD, (priority>>8) & 0xFF, 0, 0)))
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154 rc = DosSetPriority(PRTYS_THREAD, 0, priority & 0xFF, 0);
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155 }
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156 if (switch_priority)
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157 rc = DosExitMustComplete(&nesting); /* Ignore errors */
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158
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159 /* The actual blocking call is made with "normal" priority. This way we
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160 should not bother with DosSleep(0) etc. to compensate for us interrupting
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161 higher-priority threads. The goal is to prohibit the system spending too
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162 much time halt()ing, not to run us "no matter what". */
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163 if (!e) /* Wait for AsyncTimer event */
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164 badrc = DosWaitEventSem(hevEvent1, SEM_INDEFINITE_WAIT);
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165
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166 if (e) ; /* Do nothing */
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167 else if (badrc == ERROR_INTERRUPT)
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168 ret = 0;
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169 else if (badrc)
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170 e = "DosWaitEventSem";
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171 if ((rc = DosCloseEventSem(hevEvent1)) && !e) { /* Get rid of semaphore */
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172 e = "DosCloseEventSem";
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173 badrc = rc;
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174 }
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175 if (e)
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176 {
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177 SDL_SetError("[SDL_Delay] : Had error in %s(), rc is 0x%x\n", e, badrc);
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178 }
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179 }
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180
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181 /* Data to handle a single periodic alarm */
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182 static int timer_alive = 0;
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183 static SDL_Thread *timer = NULL;
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184
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185 static int SDLCALL RunTimer(void *unused)
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186 {
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187 DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0);
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188 while ( timer_alive ) {
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189 if ( SDL_timer_running ) {
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190 SDL_ThreadedTimerCheck();
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191 }
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192 SDL_Delay(10);
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193 }
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194 return(0);
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195 }
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196
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197 /* This is only called if the event thread is not running */
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198 int SDL_SYS_TimerInit(void)
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199 {
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200 timer_alive = 1;
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201 timer = SDL_CreateThread(RunTimer, NULL);
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202 if ( timer == NULL )
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203 return(-1);
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204 return(SDL_SetTimerThreaded(1));
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205 }
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206
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207 void SDL_SYS_TimerQuit(void)
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208 {
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209 timer_alive = 0;
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210 if ( timer ) {
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211 SDL_WaitThread(timer, NULL);
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212 timer = NULL;
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213 }
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214 }
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215
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216 int 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 SDL_SYS_StopTimer(void)
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223 {
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224 return;
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225 }
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226
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227 #endif /* SDL_TIMER_OS2 */