Mercurial > sdl-ios-xcode
view src/thread/pthread/SDL_syssem.c @ 4101:ab38230546a5 SDL-1.2
Oskar Linde fixed bug #507
Trackpad scrolling on OSX is broken. Scrolling up/slightly right gets
translated into a Down event in SDL. The following patch fixes this extremely
irritating issue:
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Fri, 28 Dec 2007 08:11:26 +0000 |
parents | 536b0704b7d8 |
children | c121d94672cb a1b03ba2fcd0 |
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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" #include <pthread.h> #include <semaphore.h> #include <errno.h> #include "SDL_thread.h" #include "SDL_timer.h" /* Wrapper around POSIX 1003.1b semaphores */ #ifdef __MACOSX__ /* Mac OS X doesn't support sem_getvalue() as of version 10.4 */ #include "../generic/SDL_syssem.c" #else struct SDL_semaphore { sem_t sem; }; /* Create a semaphore, initialized with value */ SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) { SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem)); if ( sem ) { if ( sem_init(&sem->sem, 0, initial_value) < 0 ) { SDL_SetError("sem_init() failed"); SDL_free(sem); sem = NULL; } } else { SDL_OutOfMemory(); } return sem; } void SDL_DestroySemaphore(SDL_sem *sem) { if ( sem ) { sem_destroy(&sem->sem); SDL_free(sem); } } int SDL_SemTryWait(SDL_sem *sem) { int retval; if ( ! sem ) { SDL_SetError("Passed a NULL semaphore"); return -1; } retval = SDL_MUTEX_TIMEDOUT; if ( sem_trywait(&sem->sem) == 0 ) { retval = 0; } return retval; } int SDL_SemWait(SDL_sem *sem) { int retval; if ( ! sem ) { SDL_SetError("Passed a NULL semaphore"); return -1; } while ( ((retval = sem_wait(&sem->sem)) == -1) && (errno == EINTR) ) {} if ( retval < 0 ) { SDL_SetError("sem_wait() failed"); } return retval; } int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) { int retval; if ( ! sem ) { SDL_SetError("Passed a NULL semaphore"); return -1; } /* Try the easy cases first */ if ( timeout == 0 ) { return SDL_SemTryWait(sem); } if ( timeout == SDL_MUTEX_MAXWAIT ) { return SDL_SemWait(sem); } /* Ack! We have to busy wait... */ /* FIXME: Use sem_timedwait()? */ timeout += SDL_GetTicks(); do { retval = SDL_SemTryWait(sem); if ( retval == 0 ) { break; } SDL_Delay(1); } while ( SDL_GetTicks() < timeout ); return retval; } Uint32 SDL_SemValue(SDL_sem *sem) { int ret = 0; if ( sem ) { sem_getvalue(&sem->sem, &ret); if ( ret < 0 ) { ret = 0; } } return (Uint32)ret; } int SDL_SemPost(SDL_sem *sem) { int retval; if ( ! sem ) { SDL_SetError("Passed a NULL semaphore"); return -1; } retval = sem_post(&sem->sem); if ( retval < 0 ) { SDL_SetError("sem_post() failed"); } return retval; } #endif /* __MACOSX__ */