Mercurial > sdl-ios-xcode
view src/thread/beos/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" /* Semaphores in the BeOS environment */ #include <be/kernel/OS.h> #include "SDL_thread.h" struct SDL_semaphore { sem_id id; }; /* Create a counting semaphore */ SDL_sem * SDL_CreateSemaphore(Uint32 initial_value) { SDL_sem *sem; sem = (SDL_sem *) SDL_malloc(sizeof(*sem)); if (sem) { sem->id = create_sem(initial_value, "SDL semaphore"); if (sem->id < B_NO_ERROR) { SDL_SetError("create_sem() failed"); SDL_free(sem); sem = NULL; } } else { SDL_OutOfMemory(); } return (sem); } /* Free the semaphore */ void SDL_DestroySemaphore(SDL_sem * sem) { if (sem) { if (sem->id >= B_NO_ERROR) { delete_sem(sem->id); } SDL_free(sem); } } int SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout) { int32 val; int retval; if (!sem) { SDL_SetError("Passed a NULL semaphore"); return -1; } tryagain: if (timeout == SDL_MUTEX_MAXWAIT) { val = acquire_sem(sem->id); } else { timeout *= 1000; /* BeOS uses a timeout in microseconds */ val = acquire_sem_etc(sem->id, 1, B_RELATIVE_TIMEOUT, timeout); } switch (val) { case B_INTERRUPTED: goto tryagain; case B_NO_ERROR: retval = 0; break; case B_TIMED_OUT: retval = SDL_MUTEX_TIMEDOUT; break; case B_WOULD_BLOCK: retval = SDL_MUTEX_TIMEDOUT; break; default: SDL_SetError("acquire_sem() failed"); retval = -1; break; } return retval; } int SDL_SemTryWait(SDL_sem * sem) { return SDL_SemWaitTimeout(sem, 0); } int SDL_SemWait(SDL_sem * sem) { return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT); } /* Returns the current count of the semaphore */ Uint32 SDL_SemValue(SDL_sem * sem) { int32 count; Uint32 value; value = 0; if (sem) { get_sem_count(sem->id, &count); if (count > 0) { value = (Uint32) count; } } return value; } /* Atomically increases the semaphore's count (not blocking) */ int SDL_SemPost(SDL_sem * sem) { if (!sem) { SDL_SetError("Passed a NULL semaphore"); return -1; } if (release_sem(sem->id) != B_NO_ERROR) { SDL_SetError("release_sem() failed"); return -1; } return 0; } /* vi: set ts=4 sw=4 expandtab: */