| 1 | /* |
| 2 | SDL - Simple DirectMedia Layer |
| 3 | Copyright (C) 1997-2009 Sam Lantinga |
| 4 | |
| 5 | This library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 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 |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with this library; if not, write to the Free Software |
| 17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | |
| 19 | Sam Lantinga |
| 20 | slouken@libsdl.org |
| 21 | */ |
| 22 | #include "SDL_config.h" |
| 23 | |
| 24 | #ifdef SDL_TIMER_OS2 |
| 25 | |
| 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" |
| 37 | #include "../SDL_timer_c.h" |
| 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 | |
| 185 | static int SDLCALL RunTimer(void *unused) |
| 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 | |
| 227 | #endif /* SDL_TIMER_OS2 */ |