Mercurial > sdl-ios-xcode
view src/thread/pthread/SDL_syssem.c @ 1551:02e19471a694
Fixed bug #4
[Note: I'm applying this patch since it's a cleaner version of what's already implemented, and supports this controller on older kernels. I'll ask to make sure this doesn't break on the new kernels where it's no longer necessary]
Date: Mon, 21 Mar 2005 09:41:11 -0500
From: Chris Nelson
Subject: SDL Patch
Hey, Ryan.
I submitted the following patch about a year ago. It's just a simple
patch for the linux port, to make multiple joysticks each appear to SDL
as their own device, if they are on the same USB port (specifically,
these guys
<http://www.consoleplus.co.uk/product_info.php?pName=super-joybox-5-quad-joypad-converter>,
which allow 4 Playstation2 controllers to be accessed via a single USB
port). Without this patch, SDL pretty much drops the ball, and reports
that there are 4 joysticks available when less than that number are
plugged in.
My work built upon the work of another person with the same device. When
I submitted the patch to the list, he tested it, but it didn't work for
him, so the patch was never accepted. Maybe about 3 times in the past
year, I've tried to email the guy, to see if he couldn't run my new
version, complete with debug code to diagnose the problem he was having.
He never got back to me.
So, I'm attaching the patch. I wish I knew why it didn't work for him,
but I've been using it for the last year with no problems. Let me know
if you need any more information, or have any ideas as to how I could
test it. I'd like to see it in the tree, but I want to make sure it works.
-Chris
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Sun, 19 Mar 2006 06:31:34 +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; }