kc3-lang/SDL/src/timer/os2/SDL_systimer.c

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• Hash : f708cebe
  Author :
  Date : 2022-04-12T15:35:32
  

  fix os2 timer in fallback mode

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• src/timer/os2/SDL_systimer.c

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:
  
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
  */
  #include "../../SDL_internal.h"
  
  #if SDL_TIMER_OS2
  
  #include "SDL_timer.h"
  #include "../../core/os2/SDL_os2.h"
  
  #define INCL_DOSERRORS
  #define INCL_DOSMISC
  #define INCL_DOSPROFILE
  #define INCL_DOSSEMAPHORES
  #define INCL_DOSDATETIME
  #define INCL_DOSPROCESS
  #define INCL_DOSEXCEPTIONS
  #include <os2.h>
  
  /* No need to switch priorities in SDL_Delay() for OS/2 versions > Warp3 fp 42, */
  /*#define _SWITCH_PRIORITY*/
  
  typedef unsigned long long  ULLONG;
  
  static SDL_bool ticks_started = SDL_FALSE;
  static ULONG    ulTmrFreq = 0;
  static ULLONG   ullTmrStart = 0;
  
  void
  SDL_TicksInit(void)
  {
      ULONG ulTmrStart;  /* for 32-bit fallback. */
      ULONG ulRC;
  
      if (ticks_started) {
          return;
      }
      ticks_started = SDL_TRUE;
  
      ulRC = DosTmrQueryFreq(&ulTmrFreq);
      if (ulRC != NO_ERROR) {
          debug_os2("DosTmrQueryFreq() failed, rc = %u", ulRC);
      } else {
          ulRC = DosTmrQueryTime((PQWORD)&ullTmrStart);
          if (ulRC == NO_ERROR) {
              return;
          }
          debug_os2("DosTmrQueryTime() failed, rc = %u", ulRC);
      }
  
      ulTmrFreq = 0; /* Error - use DosQuerySysInfo() for timer. */
      DosQuerySysInfo(QSV_MS_COUNT, QSV_MS_COUNT, &ulTmrStart, sizeof (ULONG));
      ullTmrStart = (ULLONG) ulTmrStart;
  }
  
  void
  SDL_TicksQuit(void)
  {
      ticks_started = SDL_FALSE;
  }
  
  Uint64
  SDL_GetTicks64(void)
  {
      Uint64 ui64Result;
      ULLONG ullTmrNow;
  
      if (!ticks_started) {
          SDL_TicksInit();
      }
  
      if (ulTmrFreq != 0) {
          DosTmrQueryTime((PQWORD)&ullTmrNow);
          ui64Result = (ullTmrNow - ullTmrStart) * 1000 / ulTmrFreq;
      } else {
          /* note that this counter rolls over to 0 every ~49 days. Fix your system so DosTmrQueryTime works if you need to avoid this. */
          ULONG ulTmrNow;
          DosQuerySysInfo(QSV_MS_COUNT, QSV_MS_COUNT, &ulTmrNow, sizeof (ULONG));
          ui64Result = (((Uint64) ulTmrNow) - ullTmrStart);
      }
  
      return ui64Result;
  }
  
  Uint64
  SDL_GetPerformanceCounter(void)
  {
      QWORD   qwTmrNow;
  
      if (ulTmrFreq == 0 || (DosTmrQueryTime(&qwTmrNow) != NO_ERROR)) {
          return SDL_GetTicks64();
      }
      return *((Uint64 *)&qwTmrNow);
  }
  
  Uint64
  SDL_GetPerformanceFrequency(void)
  {
      return (ulTmrFreq == 0)? 1000 : (Uint64)ulTmrFreq;
  }
  
  void
  SDL_Delay(Uint32 ms)
  {
      HTIMER  hTimer = NULLHANDLE;
      ULONG   ulRC;
  #ifdef _SWITCH_PRIORITY
      PPIB    pib;
      PTIB    tib;
      BOOL    fSetPriority = ms < 50;
      ULONG   ulSavePriority;
      ULONG   ulNesting;
  #endif
      HEV     hevTimer;
  
      if (ms == 0) {
        DosSleep(0);
        return;
      }
  
      ulRC = DosCreateEventSem(NULL, &hevTimer, DC_SEM_SHARED, FALSE);
      if (ulRC != NO_ERROR) {
          debug_os2("DosAsyncTimer() failed, rc = %u", ulRC);
          DosSleep(ms);
          return;
      }
  
  #ifdef _SWITCH_PRIORITY
      if (fSetPriority) {
          if (DosGetInfoBlocks(&tib, &pib) != NO_ERROR)
              fSetPriority = FALSE;
          else {
              ulSavePriority = tib->tib_ptib2->tib2_ulpri;
              if (((ulSavePriority & 0xFF00) == 0x0300) || /* already have high pr. */
                    (DosEnterMustComplete( &ulNesting) != NO_ERROR))
                  fSetPriority = FALSE;
              else {
                  DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0);
              }
          }
      }
  #endif
  
      DosResetEventSem(hevTimer, &ulRC);
      ulRC = DosAsyncTimer(ms, (HSEM)hevTimer, &hTimer);
  
  #ifdef _SWITCH_PRIORITY
      if (fSetPriority) {
          if (DosSetPriority(PRTYS_THREAD, (ulSavePriority >> 8) & 0xFF, 0, 0) == NO_ERROR)
              DosSetPriority(PRTYS_THREAD, 0, ulSavePriority & 0xFF, 0);
          DosExitMustComplete(&ulNesting);
      }
  #endif
  
      if (ulRC != NO_ERROR) {
          debug_os2("DosAsyncTimer() failed, rc = %u", ulRC);
      } else {
          DosWaitEventSem(hevTimer, SEM_INDEFINITE_WAIT);
      }
  
      if (ulRC != NO_ERROR)
          DosSleep(ms);
  
      DosCloseEventSem(hevTimer);
  }
  
  #endif /* SDL_TIMER_OS2 */
  
  /* vi: set ts=4 sw=4 expandtab: */
  

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