| /* |
| SDL - Simple DirectMedia Layer |
| Copyright (C) 1997-2012 Sam Lantinga |
| |
| This library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| This library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with this library; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| |
| Sam Lantinga |
| slouken@libsdl.org |
| */ |
| #include "SDL_config.h" |
| |
| #ifdef SDL_TIMER_OS2 |
| |
| #define INCL_DOSMISC |
| #define INCL_DOSERRORS |
| #define INCL_DOSSEMAPHORES |
| #define INCL_DOSDATETIME |
| #define INCL_DOSPROCESS |
| #define INCL_DOSPROFILE |
| #define INCL_DOSEXCEPTIONS |
| #include <os2.h> |
| |
| #include "SDL_thread.h" |
| #include "SDL_timer.h" |
| #include "../SDL_timer_c.h" |
| |
| |
| #define TIME_WRAP_VALUE (~(DWORD)0) |
| |
| /* The first high-resolution ticks value of the application */ |
| static long long hires_start_ticks; |
| /* The number of ticks per second of the high-resolution performance counter */ |
| static ULONG hires_ticks_per_second; |
| |
| void SDL_StartTicks(void) |
| { |
| DosTmrQueryFreq(&hires_ticks_per_second); |
| DosTmrQueryTime((PQWORD)&hires_start_ticks); |
| } |
| |
| DECLSPEC Uint32 SDLCALL SDL_GetTicks(void) |
| { |
| long long hires_now; |
| ULONG ticks = ticks; |
| |
| DosTmrQueryTime((PQWORD)&hires_now); |
| /* |
| hires_now -= hires_start_ticks; |
| hires_now *= 1000; |
| hires_now /= hires_ticks_per_second; |
| */ |
| /* inline asm to avoid runtime inclusion */ |
| _asm { |
| push edx |
| push eax |
| mov eax, dword ptr hires_now |
| mov edx, dword ptr hires_now+4 |
| sub eax, dword ptr hires_start_ticks |
| sbb edx, dword ptr hires_start_ticks+4 |
| mov ebx,1000 |
| mov ecx,edx |
| mul ebx |
| push eax |
| push edx |
| mov eax,ecx |
| mul ebx |
| pop eax |
| add edx,eax |
| pop eax |
| mov ebx, dword ptr hires_ticks_per_second |
| div ebx |
| mov dword ptr ticks, eax |
| pop edx |
| pop eax |
| } |
| |
| return ticks; |
| |
| } |
| |
| /* High resolution sleep, originally made by Ilya Zakharevich */ |
| DECLSPEC void SDLCALL SDL_Delay(Uint32 ms) |
| { |
| /* This is similar to DosSleep(), but has 8ms granularity in time-critical |
| threads even on Warp3. */ |
| HEV hevEvent1 = 0; /* Event semaphore handle */ |
| HTIMER htimerEvent1 = 0; /* Timer handle */ |
| APIRET rc = NO_ERROR; /* Return code */ |
| int ret = 1; |
| ULONG priority = 0, nesting; /* Shut down the warnings */ |
| PPIB pib; |
| PTIB tib; |
| char *e = NULL; |
| APIRET badrc; |
| int switch_priority = 50; |
| |
| DosCreateEventSem(NULL, /* Unnamed */ |
| &hevEvent1, /* Handle of semaphore returned */ |
| DC_SEM_SHARED, /* Shared needed for DosAsyncTimer */ |
| FALSE); /* Semaphore is in RESET state */ |
| |
| if (ms >= switch_priority) |
| switch_priority = 0; |
| if (switch_priority) |
| { |
| if (DosGetInfoBlocks(&tib, &pib)!=NO_ERROR) |
| switch_priority = 0; |
| else |
| { |
| /* In Warp3, to switch scheduling to 8ms step, one needs to do |
| DosAsyncTimer() in time-critical thread. On laters versions, |
| more and more cases of wait-for-something are covered. |
| |
| It turns out that on Warp3fp42 it is the priority at the time |
| of DosAsyncTimer() which matters. Let's hope that this works |
| with later versions too... XXXX |
| */ |
| priority = (tib->tib_ptib2->tib2_ulpri); |
| if ((priority & 0xFF00) == 0x0300) /* already time-critical */ |
| switch_priority = 0; |
| /* Make us time-critical. Just modifying TIB is not enough... */ |
| /* tib->tib_ptib2->tib2_ulpri = 0x0300;*/ |
| /* We do not want to run at high priority if a signal causes us |
| to longjmp() out of this section... */ |
| if (DosEnterMustComplete(&nesting)) |
| switch_priority = 0; |
| else |
| DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0); |
| } |
| } |
| |
| if ((badrc = DosAsyncTimer(ms, |
| (HSEM) hevEvent1, /* Semaphore to post */ |
| &htimerEvent1))) /* Timer handler (returned) */ |
| e = "DosAsyncTimer"; |
| |
| if (switch_priority && tib->tib_ptib2->tib2_ulpri == 0x0300) |
| { |
| /* Nobody switched priority while we slept... Ignore errors... */ |
| /* tib->tib_ptib2->tib2_ulpri = priority; */ /* Get back... */ |
| if (!(rc = DosSetPriority(PRTYS_THREAD, (priority>>8) & 0xFF, 0, 0))) |
| rc = DosSetPriority(PRTYS_THREAD, 0, priority & 0xFF, 0); |
| } |
| if (switch_priority) |
| rc = DosExitMustComplete(&nesting); /* Ignore errors */ |
| |
| /* The actual blocking call is made with "normal" priority. This way we |
| should not bother with DosSleep(0) etc. to compensate for us interrupting |
| higher-priority threads. The goal is to prohibit the system spending too |
| much time halt()ing, not to run us "no matter what". */ |
| if (!e) /* Wait for AsyncTimer event */ |
| badrc = DosWaitEventSem(hevEvent1, SEM_INDEFINITE_WAIT); |
| |
| if (e) ; /* Do nothing */ |
| else if (badrc == ERROR_INTERRUPT) |
| ret = 0; |
| else if (badrc) |
| e = "DosWaitEventSem"; |
| if ((rc = DosCloseEventSem(hevEvent1)) && !e) { /* Get rid of semaphore */ |
| e = "DosCloseEventSem"; |
| badrc = rc; |
| } |
| if (e) |
| { |
| SDL_SetError("[SDL_Delay] : Had error in %s(), rc is 0x%x\n", e, badrc); |
| } |
| } |
| |
| /* Data to handle a single periodic alarm */ |
| static int timer_alive = 0; |
| static SDL_Thread *timer = NULL; |
| |
| static int SDLCALL RunTimer(void *unused) |
| { |
| DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0); |
| while ( timer_alive ) { |
| if ( SDL_timer_running ) { |
| SDL_ThreadedTimerCheck(); |
| } |
| SDL_Delay(10); |
| } |
| return(0); |
| } |
| |
| /* This is only called if the event thread is not running */ |
| int SDL_SYS_TimerInit(void) |
| { |
| timer_alive = 1; |
| timer = SDL_CreateThread(RunTimer, NULL); |
| if ( timer == NULL ) |
| return(-1); |
| return(SDL_SetTimerThreaded(1)); |
| } |
| |
| void SDL_SYS_TimerQuit(void) |
| { |
| timer_alive = 0; |
| if ( timer ) { |
| SDL_WaitThread(timer, NULL); |
| timer = NULL; |
| } |
| } |
| |
| int SDL_SYS_StartTimer(void) |
| { |
| SDL_SetError("Internal logic error: OS/2 uses threaded timer"); |
| return(-1); |
| } |
| |
| void SDL_SYS_StopTimer(void) |
| { |
| return; |
| } |
| |
| #endif /* SDL_TIMER_OS2 */ |
