Mercurial > sdl-ios-xcode
annotate src/timer/os2/SDL_systimer.c @ 1312:c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
I batch edited these files, so please let me know if I've accidentally removed anybody's
credit here.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 01 Feb 2006 06:32:25 +0000 |
| parents | 173c063d4f55 |
| children | c71e05b4dc2e |
| rev | line source |
|---|---|
| 1190 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1190
diff
changeset
|
3 Copyright (C) 1997-2006 Sam Lantinga |
| 1190 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1190
diff
changeset
|
6 modify it under the terms of the GNU Lesser General Public |
| 1190 | 7 License as published by the Free Software Foundation; either |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1190
diff
changeset
|
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 | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1190
diff
changeset
|
13 Lesser General Public License for more details. |
| 1190 | 14 |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1190
diff
changeset
|
15 You should have received a copy of the GNU Lesser General Public |
|
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1190
diff
changeset
|
16 License along with this library; if not, write to the Free Software |
|
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1190
diff
changeset
|
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 1190 | 18 |
| 19 Sam Lantinga | |
| 20 slouken@libsdl.org | |
| 21 */ | |
| 22 | |
| 23 #define INCL_DOSMISC | |
| 24 #define INCL_DOSERRORS | |
| 25 #define INCL_DOSSEMAPHORES | |
| 26 #define INCL_DOSDATETIME | |
| 27 #define INCL_DOSPROCESS | |
| 28 #define INCL_DOSPROFILE | |
| 29 #define INCL_DOSEXCEPTIONS | |
| 30 #include <os2.h> | |
| 31 | |
| 32 #include "SDL_thread.h" | |
| 33 #include "SDL_timer.h" | |
| 34 #include "SDL_timer_c.h" | |
| 35 #include "SDL_error.h" | |
| 36 | |
| 37 | |
| 38 #define TIME_WRAP_VALUE (~(DWORD)0) | |
| 39 | |
| 40 /* The first high-resolution ticks value of the application */ | |
| 41 static long long hires_start_ticks; | |
| 42 /* The number of ticks per second of the high-resolution performance counter */ | |
| 43 static ULONG hires_ticks_per_second; | |
| 44 | |
| 45 void SDL_StartTicks(void) | |
| 46 { | |
| 47 DosTmrQueryFreq(&hires_ticks_per_second); | |
| 48 DosTmrQueryTime((PQWORD)&hires_start_ticks); | |
| 49 } | |
| 50 | |
| 51 DECLSPEC Uint32 SDLCALL SDL_GetTicks(void) | |
| 52 { | |
| 53 long long hires_now; | |
| 54 ULONG ticks = ticks; | |
| 55 | |
| 56 DosTmrQueryTime((PQWORD)&hires_now); | |
| 57 /* | |
| 58 hires_now -= hires_start_ticks; | |
| 59 hires_now *= 1000; | |
| 60 hires_now /= hires_ticks_per_second; | |
| 61 */ | |
| 62 /* inline asm to avoid runtime inclusion */ | |
| 63 _asm { | |
| 64 push edx | |
| 65 push eax | |
| 66 mov eax, dword ptr hires_now | |
| 67 mov edx, dword ptr hires_now+4 | |
| 68 sub eax, dword ptr hires_start_ticks | |
| 69 sbb edx, dword ptr hires_start_ticks+4 | |
| 70 mov ebx,1000 | |
| 71 mov ecx,edx | |
| 72 mul ebx | |
| 73 push eax | |
| 74 push edx | |
| 75 mov eax,ecx | |
| 76 mul ebx | |
| 77 pop eax | |
| 78 add edx,eax | |
| 79 pop eax | |
| 80 mov ebx, dword ptr hires_ticks_per_second | |
| 81 div ebx | |
| 82 mov dword ptr ticks, eax | |
| 83 pop edx | |
| 84 pop eax | |
| 85 } | |
| 86 | |
| 87 return ticks; | |
| 88 | |
| 89 } | |
| 90 | |
| 91 /* High resolution sleep, originally made by Ilya Zakharevich */ | |
| 92 DECLSPEC void SDLCALL SDL_Delay(Uint32 ms) | |
| 93 { | |
| 94 /* This is similar to DosSleep(), but has 8ms granularity in time-critical | |
| 95 threads even on Warp3. */ | |
| 96 HEV hevEvent1 = 0; /* Event semaphore handle */ | |
| 97 HTIMER htimerEvent1 = 0; /* Timer handle */ | |
| 98 APIRET rc = NO_ERROR; /* Return code */ | |
| 99 int ret = 1; | |
| 100 ULONG priority = 0, nesting; /* Shut down the warnings */ | |
| 101 PPIB pib; | |
| 102 PTIB tib; | |
| 103 char *e = NULL; | |
| 104 APIRET badrc; | |
| 105 int switch_priority = 50; | |
| 106 | |
| 107 DosCreateEventSem(NULL, /* Unnamed */ | |
| 108 &hevEvent1, /* Handle of semaphore returned */ | |
| 109 DC_SEM_SHARED, /* Shared needed for DosAsyncTimer */ | |
| 110 FALSE); /* Semaphore is in RESET state */ | |
| 111 | |
| 112 if (ms >= switch_priority) | |
| 113 switch_priority = 0; | |
| 114 if (switch_priority) | |
| 115 { | |
| 116 if (DosGetInfoBlocks(&tib, &pib)!=NO_ERROR) | |
| 117 switch_priority = 0; | |
| 118 else | |
| 119 { | |
| 120 /* In Warp3, to switch scheduling to 8ms step, one needs to do | |
| 121 DosAsyncTimer() in time-critical thread. On laters versions, | |
| 122 more and more cases of wait-for-something are covered. | |
| 123 | |
| 124 It turns out that on Warp3fp42 it is the priority at the time | |
| 125 of DosAsyncTimer() which matters. Let's hope that this works | |
| 126 with later versions too... XXXX | |
| 127 */ | |
| 128 priority = (tib->tib_ptib2->tib2_ulpri); | |
| 129 if ((priority & 0xFF00) == 0x0300) /* already time-critical */ | |
| 130 switch_priority = 0; | |
| 131 /* Make us time-critical. Just modifying TIB is not enough... */ | |
| 132 /* tib->tib_ptib2->tib2_ulpri = 0x0300;*/ | |
| 133 /* We do not want to run at high priority if a signal causes us | |
| 134 to longjmp() out of this section... */ | |
| 135 if (DosEnterMustComplete(&nesting)) | |
| 136 switch_priority = 0; | |
| 137 else | |
| 138 DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0); | |
| 139 } | |
| 140 } | |
| 141 | |
| 142 if ((badrc = DosAsyncTimer(ms, | |
| 143 (HSEM) hevEvent1, /* Semaphore to post */ | |
| 144 &htimerEvent1))) /* Timer handler (returned) */ | |
| 145 e = "DosAsyncTimer"; | |
| 146 | |
| 147 if (switch_priority && tib->tib_ptib2->tib2_ulpri == 0x0300) | |
| 148 { | |
| 149 /* Nobody switched priority while we slept... Ignore errors... */ | |
| 150 /* tib->tib_ptib2->tib2_ulpri = priority; */ /* Get back... */ | |
| 151 if (!(rc = DosSetPriority(PRTYS_THREAD, (priority>>8) & 0xFF, 0, 0))) | |
| 152 rc = DosSetPriority(PRTYS_THREAD, 0, priority & 0xFF, 0); | |
| 153 } | |
| 154 if (switch_priority) | |
| 155 rc = DosExitMustComplete(&nesting); /* Ignore errors */ | |
| 156 | |
| 157 /* The actual blocking call is made with "normal" priority. This way we | |
| 158 should not bother with DosSleep(0) etc. to compensate for us interrupting | |
| 159 higher-priority threads. The goal is to prohibit the system spending too | |
| 160 much time halt()ing, not to run us "no matter what". */ | |
| 161 if (!e) /* Wait for AsyncTimer event */ | |
| 162 badrc = DosWaitEventSem(hevEvent1, SEM_INDEFINITE_WAIT); | |
| 163 | |
| 164 if (e) ; /* Do nothing */ | |
| 165 else if (badrc == ERROR_INTERRUPT) | |
| 166 ret = 0; | |
| 167 else if (badrc) | |
| 168 e = "DosWaitEventSem"; | |
| 169 if ((rc = DosCloseEventSem(hevEvent1)) && !e) { /* Get rid of semaphore */ | |
| 170 e = "DosCloseEventSem"; | |
| 171 badrc = rc; | |
| 172 } | |
| 173 if (e) | |
| 174 { | |
| 175 SDL_SetError("[SDL_Delay] : Had error in %s(), rc is 0x%x\n", e, badrc); | |
| 176 } | |
| 177 } | |
| 178 | |
| 179 /* Data to handle a single periodic alarm */ | |
| 180 static int timer_alive = 0; | |
| 181 static SDL_Thread *timer = NULL; | |
| 182 | |
| 183 static int RunTimer(void *unused) | |
| 184 { | |
| 185 DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0); | |
| 186 while ( timer_alive ) { | |
| 187 if ( SDL_timer_running ) { | |
| 188 SDL_ThreadedTimerCheck(); | |
| 189 } | |
| 190 SDL_Delay(10); | |
| 191 } | |
| 192 return(0); | |
| 193 } | |
| 194 | |
| 195 /* This is only called if the event thread is not running */ | |
| 196 int SDL_SYS_TimerInit(void) | |
| 197 { | |
| 198 timer_alive = 1; | |
| 199 timer = SDL_CreateThread(RunTimer, NULL); | |
| 200 if ( timer == NULL ) | |
| 201 return(-1); | |
| 202 return(SDL_SetTimerThreaded(1)); | |
| 203 } | |
| 204 | |
| 205 void SDL_SYS_TimerQuit(void) | |
| 206 { | |
| 207 timer_alive = 0; | |
| 208 if ( timer ) { | |
| 209 SDL_WaitThread(timer, NULL); | |
| 210 timer = NULL; | |
| 211 } | |
| 212 } | |
| 213 | |
| 214 int SDL_SYS_StartTimer(void) | |
| 215 { | |
| 216 SDL_SetError("Internal logic error: OS/2 uses threaded timer"); | |
| 217 return(-1); | |
| 218 } | |
| 219 | |
| 220 void SDL_SYS_StopTimer(void) | |
| 221 { | |
| 222 return; | |
| 223 } | |
| 224 | |
| 225 |