Mercurial > sdl-ios-xcode
view src/thread/os2/SDL_syssem.c @ 2349:0381047f2210 gsoc2008_iphone
The class SDL_uikitappdelegate acts as the UIApplicationDelegate for an iPhone SDL project. This class is reponsible for application control flow, including initial setup of working directory, forwarding command line arguments to the user's main function, and handling application termination.
author | Holmes Futrell <hfutrell@umail.ucsb.edu> |
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date | Thu, 17 Jul 2008 22:29:37 +0000 |
parents | c121d94672cb |
children | 99210400e8b9 |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2006 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" /* Semaphore functions using the OS/2 API */ #define INCL_DOS #define INCL_DOSERRORS #define INCL_DOSSEMAPHORES #include <os2.h> #include "SDL_thread.h" #include "SDL_timer.h" struct SDL_semaphore { HMTX id; HEV changed; Uint32 value; }; /* Create a semaphore */ DECLSPEC SDL_sem *SDLCALL SDL_CreateSemaphore(Uint32 initial_value) { SDL_sem *sem; ULONG ulrc; /* Allocate sem memory */ sem = (SDL_sem *) SDL_malloc(sizeof(*sem)); if (sem) { /* Create the mutex semaphore */ ulrc = DosCreateMutexSem(NULL, &(sem->id), 0, TRUE); if (ulrc) { SDL_SetError("Couldn't create semaphore"); SDL_free(sem); sem = NULL; } else { DosCreateEventSem(NULL, &(sem->changed), 0, FALSE); sem->value = initial_value; DosReleaseMutexSem(sem->id); } } else { SDL_OutOfMemory(); } return (sem); } /* Free the semaphore */ DECLSPEC void SDLCALL SDL_DestroySemaphore(SDL_sem * sem) { if (sem) { if (sem->id) { DosCloseEventSem(sem->changed); DosCloseMutexSem(sem->id); sem->id = 0; } SDL_free(sem); } } DECLSPEC int SDLCALL SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout) { ULONG ulrc; if (!sem) { SDL_SetError("Passed a NULL sem"); return -1; } if (timeout == SDL_MUTEX_MAXWAIT) { while (1) { ulrc = DosRequestMutexSem(sem->id, SEM_INDEFINITE_WAIT); if (ulrc) { /* if error waiting mutex */ SDL_SetError("DosRequestMutexSem() failed"); return -1; } else if (sem->value) { sem->value--; DosReleaseMutexSem(sem->id); return 0; } else { ULONG ulPostCount; DosResetEventSem(sem->changed, &ulPostCount); DosReleaseMutexSem(sem->id); /* continue waiting until somebody posts the semaphore */ DosWaitEventSem(sem->changed, SEM_INDEFINITE_WAIT); } } } else if (timeout == 0) { ulrc = DosRequestMutexSem(sem->id, SEM_INDEFINITE_WAIT); if (ulrc == NO_ERROR) { if (sem->value) { sem->value--; DosReleaseMutexSem(sem->id); return 0; } else { DosReleaseMutexSem(sem->id); return SDL_MUTEX_TIMEDOUT; } } else { SDL_SetError("DosRequestMutexSem() failed"); return -1; } } else { ulrc = DosRequestMutexSem(sem->id, SEM_INDEFINITE_WAIT); if (ulrc) { /* if error waiting mutex */ SDL_SetError("DosRequestMutexSem() failed"); return -1; } else if (sem->value) { sem->value--; DosReleaseMutexSem(sem->id); return 0; } else { ULONG ulPostCount; DosResetEventSem(sem->changed, &ulPostCount); DosReleaseMutexSem(sem->id); /* continue waiting until somebody posts the semaphore */ ulrc = DosWaitEventSem(sem->changed, timeout); if (ulrc == NO_ERROR) return 0; else return SDL_MUTEX_TIMEDOUT; } } /* never reached */ return -1; } DECLSPEC int SDLCALL SDL_SemTryWait(SDL_sem * sem) { return SDL_SemWaitTimeout(sem, 0); } DECLSPEC int SDLCALL SDL_SemWait(SDL_sem * sem) { return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT); } /* Returns the current count of the semaphore */ DECLSPEC Uint32 SDLCALL SDL_SemValue(SDL_sem * sem) { if (!sem) { SDL_SetError("Passed a NULL sem"); return 0; } return sem->value; } DECLSPEC int SDLCALL SDL_SemPost(SDL_sem * sem) { if (!sem) { SDL_SetError("Passed a NULL sem"); return -1; } if (DosRequestMutexSem(sem->id, SEM_INDEFINITE_WAIT)) { SDL_SetError("DosRequestMutexSem() failed"); return -1; } sem->value++; DosPostEventSem(sem->changed); DosReleaseMutexSem(sem->id); return 0; } /* vi: set ts=4 sw=4 expandtab: */