Mercurial > sdl-ios-xcode
view src/thread/pthread/SDL_syscond.c @ 2960:91708bc14aab
It's probably not worth pushing palettized textures. The memory optimization
isn't worth the effort on modern hardware with the sorts of games that would
be using the SDL 1.3 texture API.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Fri, 02 Jan 2009 09:27:36 +0000 |
parents | 99210400e8b9 |
children | f7b03b6838cb |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2009 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" #include <sys/time.h> #include <unistd.h> #include <errno.h> #include <pthread.h> #include "SDL_thread.h" #include "SDL_sysmutex_c.h" struct SDL_cond { pthread_cond_t cond; }; /* Create a condition variable */ SDL_cond * SDL_CreateCond(void) { SDL_cond *cond; cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond)); if (cond) { if (pthread_cond_init(&cond->cond, NULL) < 0) { SDL_SetError("pthread_cond_init() failed"); SDL_free(cond); cond = NULL; } } return (cond); } /* Destroy a condition variable */ void SDL_DestroyCond(SDL_cond * cond) { if (cond) { pthread_cond_destroy(&cond->cond); SDL_free(cond); } } /* Restart one of the threads that are waiting on the condition variable */ int SDL_CondSignal(SDL_cond * cond) { int retval; if (!cond) { SDL_SetError("Passed a NULL condition variable"); return -1; } retval = 0; if (pthread_cond_signal(&cond->cond) != 0) { SDL_SetError("pthread_cond_signal() failed"); retval = -1; } return retval; } /* Restart all threads that are waiting on the condition variable */ int SDL_CondBroadcast(SDL_cond * cond) { int retval; if (!cond) { SDL_SetError("Passed a NULL condition variable"); return -1; } retval = 0; if (pthread_cond_broadcast(&cond->cond) != 0) { SDL_SetError("pthread_cond_broadcast() failed"); retval = -1; } return retval; } int SDL_CondWaitTimeout(SDL_cond * cond, SDL_mutex * mutex, Uint32 ms) { int retval; struct timeval delta; struct timespec abstime; if (!cond) { SDL_SetError("Passed a NULL condition variable"); return -1; } gettimeofday(&delta, NULL); abstime.tv_sec = delta.tv_sec + (ms / 1000); abstime.tv_nsec = (delta.tv_usec + (ms % 1000) * 1000) * 1000; if (abstime.tv_nsec > 1000000000) { abstime.tv_sec += 1; abstime.tv_nsec -= 1000000000; } tryagain: retval = pthread_cond_timedwait(&cond->cond, &mutex->id, &abstime); switch (retval) { case EINTR: goto tryagain; break; case ETIMEDOUT: retval = SDL_MUTEX_TIMEDOUT; break; case 0: break; default: SDL_SetError("pthread_cond_timedwait() failed"); retval = -1; break; } return retval; } /* Wait on the condition variable, unlocking the provided mutex. The mutex must be locked before entering this function! */ int SDL_CondWait(SDL_cond * cond, SDL_mutex * mutex) { int retval; if (!cond) { SDL_SetError("Passed a NULL condition variable"); return -1; } retval = 0; if (pthread_cond_wait(&cond->cond, &mutex->id) != 0) { SDL_SetError("pthread_cond_wait() failed"); retval = -1; } return retval; } /* vi: set ts=4 sw=4 expandtab: */