Mercurial > sdl-ios-xcode
view src/thread/pthread/SDL_syssem.c @ 1614:6162b8d921ce
Date: Wed, 29 Mar 2006 17:26:55 +0200 CEST
From: "Fran���is Revol"
Subject: [SDL] BeOS port fix: PrintScreen key crashing
It seems the latest SDL crashes when someone hits the PrtScrn key in
ZETA (BeOS R6), somewhere it gets a negative value as key code (or a
big unsigned maybe ?), and uses it as an index in the keysym table...
I'll investigate the cause for the negative value, but it's always
better to check for bounds correctly when indexing a table. The
attached diff fixes it.
Fran���is Revol
--
Software Architect
yellowTAB GmbH
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Fri, 31 Mar 2006 06:16:20 +0000 |
parents | dc6b59e925a2 |
children | aee7ea396f59 |
line wrap: on
line source
/* 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 "SDL_thread.h" #include "SDL_timer.h" /* Wrapper around POSIX 1003.1b semaphores */ #ifdef __MACOSX__ #define USE_NAMED_SEMAPHORES 1 #include <unistd.h> #endif struct SDL_semaphore { sem_t *sem; #if !USE_NAMED_SEMAPHORES sem_t sem_data; #endif }; /* 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 USE_NAMED_SEMAPHORES static int semnum = 0; char name[32]; SDL_snprintf(name, SDL_arraysize(name), "/SDL_sem-%d-%4.4d", getpid(), semnum++); sem->sem = sem_open(name, O_CREAT, 0600, initial_value); if ( sem->sem == (sem_t *)SEM_FAILED ) { SDL_SetError("sem_open(%s) failed", name); SDL_free(sem); sem = NULL; } else { sem_unlink(name); } #else if ( sem_init(&sem->sem_data, 0, initial_value) < 0 ) { SDL_SetError("sem_init() failed"); SDL_free(sem); sem = NULL; } else { sem->sem = &sem->sem_data; } #endif /* USE_NAMED_SEMAPHORES */ } else { SDL_OutOfMemory(); } return sem; } void SDL_DestroySemaphore(SDL_sem *sem) { if ( sem ) { #if USE_NAMED_SEMAPHORES sem_close(sem->sem); #else sem_destroy(sem->sem); #endif 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; } retval = sem_wait(sem->sem); 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... */ 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; }