kc3-lang/SDL/src/thread/n3ds/SDL_syssem.c

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• Hash : 65527537
  Author :
  Date : 2021-03-30T04:32:39
  

  N3DS port (squashed) A dedicated renderer using Citro3D would likely allow for better much better graphical performances.

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• src/thread/n3ds/SDL_syssem.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"
  
  #ifdef SDL_THREAD_N3DS
  
  /* An implementation of semaphores using libctru's LightSemaphore */
  
  #include <3ds.h>
  
  #include "SDL_thread.h"
  
  struct SDL_semaphore
  {
      LightSemaphore semaphore;
  };
  
  SDL_sem *
  SDL_CreateSemaphore(Uint32 initial_value)
  {
      SDL_sem *sem;
  
      if (initial_value > SDL_MAX_SINT16) {
          SDL_SetError("Initial semaphore value too high for this platform");
          return NULL;
      }
  
      sem = (SDL_sem *) SDL_malloc(sizeof(*sem));
      if (!sem) {
          SDL_OutOfMemory();
          return NULL;
      }
  
      LightSemaphore_Init(&sem->semaphore, initial_value, SDL_MAX_SINT16);
  
      return sem;
  }
  
  /* WARNING:
     You cannot call this function when another thread is using the semaphore.
  */
  void
  SDL_DestroySemaphore(SDL_sem *sem)
  {
      if (sem) {
          SDL_free(sem);
      }
  }
  
  int
  SDL_SemTryWait(SDL_sem *sem)
  {
      if (!sem) {
          return SDL_SetError("Passed a NULL semaphore");
      }
  
      return SDL_SemWaitTimeout(sem, 0);
  }
  
  int
  SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
  {
      int retval;
  
      if (!sem) {
          return SDL_SetError("Passed a NULL semaphore");
      }
  
      if (timeout == SDL_MUTEX_MAXWAIT) {
          LightSemaphore_Acquire(&sem->semaphore, 1);
          retval = 0;
      } else {
          int return_code = LightSemaphore_TryAcquire(&sem->semaphore, 1);
          if (return_code != 0) {
              for (u32 i = 0; i < timeout; i++) {
                  svcSleepThread(1000000LL);
                  return_code = LightSemaphore_TryAcquire(&sem->semaphore, 1);
                  if (return_code == 0) {
                      break;
                  }
              }
          }
          retval = return_code != 0 ? SDL_MUTEX_TIMEDOUT : 0;
      }
  
      return retval;
  }
  
  int
  SDL_SemWait(SDL_sem *sem)
  {
      return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
  }
  
  Uint32
  SDL_SemValue(SDL_sem *sem)
  {
      if (!sem) {
          return SDL_SetError("Passed a NULL semaphore");
      }
      return sem->semaphore.current_count;
  }
  
  int
  SDL_SemPost(SDL_sem *sem)
  {
      if (!sem) {
          return SDL_SetError("Passed a NULL semaphore");
      }
      LightSemaphore_Release(&sem->semaphore, 1);
      return 0;
  }
  
  #endif /* SDL_THREAD_N3DS */
  
  /* vi: set sts=4 ts=4 sw=4 expandtab: */
  

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