Mercurial > sdl-ios-xcode
annotate src/timer/os2/SDL_systimer.c @ 3955:40b6b5744e05 SDL-1.2
Avoid switch to supervisor mode in SDL_GetTicks, by updating system counter from vbl interrupt
| author | Patrice Mandin <patmandin@gmail.com> |
|---|---|
| date | Sat, 09 Jun 2007 19:52:05 +0000 |
| parents | d5d3a6fe05a1 |
| children | c121d94672cb a1b03ba2fcd0 |
| rev | line source |
|---|---|
| 1190 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 1190 | 4 |
| 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 |
| 1190 | 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. |
| 1190 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
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13 Lesser General Public License for more details. |
| 1190 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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c9b51268668f
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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 |
| 1190 | 18 |
| 19 Sam Lantinga | |
| 20 slouken@libsdl.org | |
| 21 */ | |
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22 #include "SDL_config.h" |
| 1190 | 23 |
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24 #ifdef SDL_TIMER_OS2 |
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25 |
| 1190 | 26 #define INCL_DOSMISC |
| 27 #define INCL_DOSERRORS | |
| 28 #define INCL_DOSSEMAPHORES | |
| 29 #define INCL_DOSDATETIME | |
| 30 #define INCL_DOSPROCESS | |
| 31 #define INCL_DOSPROFILE | |
| 32 #define INCL_DOSEXCEPTIONS | |
| 33 #include <os2.h> | |
| 34 | |
| 35 #include "SDL_thread.h" | |
| 36 #include "SDL_timer.h" | |
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37 #include "../SDL_timer_c.h" |
| 1190 | 38 |
| 39 | |
| 40 #define TIME_WRAP_VALUE (~(DWORD)0) | |
| 41 | |
| 42 /* The first high-resolution ticks value of the application */ | |
| 43 static long long hires_start_ticks; | |
| 44 /* The number of ticks per second of the high-resolution performance counter */ | |
| 45 static ULONG hires_ticks_per_second; | |
| 46 | |
| 47 void SDL_StartTicks(void) | |
| 48 { | |
| 49 DosTmrQueryFreq(&hires_ticks_per_second); | |
| 50 DosTmrQueryTime((PQWORD)&hires_start_ticks); | |
| 51 } | |
| 52 | |
| 53 DECLSPEC Uint32 SDLCALL SDL_GetTicks(void) | |
| 54 { | |
| 55 long long hires_now; | |
| 56 ULONG ticks = ticks; | |
| 57 | |
| 58 DosTmrQueryTime((PQWORD)&hires_now); | |
| 59 /* | |
| 60 hires_now -= hires_start_ticks; | |
| 61 hires_now *= 1000; | |
| 62 hires_now /= hires_ticks_per_second; | |
| 63 */ | |
| 64 /* inline asm to avoid runtime inclusion */ | |
| 65 _asm { | |
| 66 push edx | |
| 67 push eax | |
| 68 mov eax, dword ptr hires_now | |
| 69 mov edx, dword ptr hires_now+4 | |
| 70 sub eax, dword ptr hires_start_ticks | |
| 71 sbb edx, dword ptr hires_start_ticks+4 | |
| 72 mov ebx,1000 | |
| 73 mov ecx,edx | |
| 74 mul ebx | |
| 75 push eax | |
| 76 push edx | |
| 77 mov eax,ecx | |
| 78 mul ebx | |
| 79 pop eax | |
| 80 add edx,eax | |
| 81 pop eax | |
| 82 mov ebx, dword ptr hires_ticks_per_second | |
| 83 div ebx | |
| 84 mov dword ptr ticks, eax | |
| 85 pop edx | |
| 86 pop eax | |
| 87 } | |
| 88 | |
| 89 return ticks; | |
| 90 | |
| 91 } | |
| 92 | |
| 93 /* High resolution sleep, originally made by Ilya Zakharevich */ | |
| 94 DECLSPEC void SDLCALL SDL_Delay(Uint32 ms) | |
| 95 { | |
| 96 /* This is similar to DosSleep(), but has 8ms granularity in time-critical | |
| 97 threads even on Warp3. */ | |
| 98 HEV hevEvent1 = 0; /* Event semaphore handle */ | |
| 99 HTIMER htimerEvent1 = 0; /* Timer handle */ | |
| 100 APIRET rc = NO_ERROR; /* Return code */ | |
| 101 int ret = 1; | |
| 102 ULONG priority = 0, nesting; /* Shut down the warnings */ | |
| 103 PPIB pib; | |
| 104 PTIB tib; | |
| 105 char *e = NULL; | |
| 106 APIRET badrc; | |
| 107 int switch_priority = 50; | |
| 108 | |
| 109 DosCreateEventSem(NULL, /* Unnamed */ | |
| 110 &hevEvent1, /* Handle of semaphore returned */ | |
| 111 DC_SEM_SHARED, /* Shared needed for DosAsyncTimer */ | |
| 112 FALSE); /* Semaphore is in RESET state */ | |
| 113 | |
| 114 if (ms >= switch_priority) | |
| 115 switch_priority = 0; | |
| 116 if (switch_priority) | |
| 117 { | |
| 118 if (DosGetInfoBlocks(&tib, &pib)!=NO_ERROR) | |
| 119 switch_priority = 0; | |
| 120 else | |
| 121 { | |
| 122 /* In Warp3, to switch scheduling to 8ms step, one needs to do | |
| 123 DosAsyncTimer() in time-critical thread. On laters versions, | |
| 124 more and more cases of wait-for-something are covered. | |
| 125 | |
| 126 It turns out that on Warp3fp42 it is the priority at the time | |
| 127 of DosAsyncTimer() which matters. Let's hope that this works | |
| 128 with later versions too... XXXX | |
| 129 */ | |
| 130 priority = (tib->tib_ptib2->tib2_ulpri); | |
| 131 if ((priority & 0xFF00) == 0x0300) /* already time-critical */ | |
| 132 switch_priority = 0; | |
| 133 /* Make us time-critical. Just modifying TIB is not enough... */ | |
| 134 /* tib->tib_ptib2->tib2_ulpri = 0x0300;*/ | |
| 135 /* We do not want to run at high priority if a signal causes us | |
| 136 to longjmp() out of this section... */ | |
| 137 if (DosEnterMustComplete(&nesting)) | |
| 138 switch_priority = 0; | |
| 139 else | |
| 140 DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0); | |
| 141 } | |
| 142 } | |
| 143 | |
| 144 if ((badrc = DosAsyncTimer(ms, | |
| 145 (HSEM) hevEvent1, /* Semaphore to post */ | |
| 146 &htimerEvent1))) /* Timer handler (returned) */ | |
| 147 e = "DosAsyncTimer"; | |
| 148 | |
| 149 if (switch_priority && tib->tib_ptib2->tib2_ulpri == 0x0300) | |
| 150 { | |
| 151 /* Nobody switched priority while we slept... Ignore errors... */ | |
| 152 /* tib->tib_ptib2->tib2_ulpri = priority; */ /* Get back... */ | |
| 153 if (!(rc = DosSetPriority(PRTYS_THREAD, (priority>>8) & 0xFF, 0, 0))) | |
| 154 rc = DosSetPriority(PRTYS_THREAD, 0, priority & 0xFF, 0); | |
| 155 } | |
| 156 if (switch_priority) | |
| 157 rc = DosExitMustComplete(&nesting); /* Ignore errors */ | |
| 158 | |
| 159 /* The actual blocking call is made with "normal" priority. This way we | |
| 160 should not bother with DosSleep(0) etc. to compensate for us interrupting | |
| 161 higher-priority threads. The goal is to prohibit the system spending too | |
| 162 much time halt()ing, not to run us "no matter what". */ | |
| 163 if (!e) /* Wait for AsyncTimer event */ | |
| 164 badrc = DosWaitEventSem(hevEvent1, SEM_INDEFINITE_WAIT); | |
| 165 | |
| 166 if (e) ; /* Do nothing */ | |
| 167 else if (badrc == ERROR_INTERRUPT) | |
| 168 ret = 0; | |
| 169 else if (badrc) | |
| 170 e = "DosWaitEventSem"; | |
| 171 if ((rc = DosCloseEventSem(hevEvent1)) && !e) { /* Get rid of semaphore */ | |
| 172 e = "DosCloseEventSem"; | |
| 173 badrc = rc; | |
| 174 } | |
| 175 if (e) | |
| 176 { | |
| 177 SDL_SetError("[SDL_Delay] : Had error in %s(), rc is 0x%x\n", e, badrc); | |
| 178 } | |
| 179 } | |
| 180 | |
| 181 /* Data to handle a single periodic alarm */ | |
| 182 static int timer_alive = 0; | |
| 183 static SDL_Thread *timer = NULL; | |
| 184 | |
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185 static int SDLCALL RunTimer(void *unused) |
| 1190 | 186 { |
| 187 DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0); | |
| 188 while ( timer_alive ) { | |
| 189 if ( SDL_timer_running ) { | |
| 190 SDL_ThreadedTimerCheck(); | |
| 191 } | |
| 192 SDL_Delay(10); | |
| 193 } | |
| 194 return(0); | |
| 195 } | |
| 196 | |
| 197 /* This is only called if the event thread is not running */ | |
| 198 int SDL_SYS_TimerInit(void) | |
| 199 { | |
| 200 timer_alive = 1; | |
| 201 timer = SDL_CreateThread(RunTimer, NULL); | |
| 202 if ( timer == NULL ) | |
| 203 return(-1); | |
| 204 return(SDL_SetTimerThreaded(1)); | |
| 205 } | |
| 206 | |
| 207 void SDL_SYS_TimerQuit(void) | |
| 208 { | |
| 209 timer_alive = 0; | |
| 210 if ( timer ) { | |
| 211 SDL_WaitThread(timer, NULL); | |
| 212 timer = NULL; | |
| 213 } | |
| 214 } | |
| 215 | |
| 216 int SDL_SYS_StartTimer(void) | |
| 217 { | |
| 218 SDL_SetError("Internal logic error: OS/2 uses threaded timer"); | |
| 219 return(-1); | |
| 220 } | |
| 221 | |
| 222 void SDL_SYS_StopTimer(void) | |
| 223 { | |
| 224 return; | |
| 225 } | |
| 226 | |
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227 #endif /* SDL_TIMER_OS2 */ |