diff options
Diffstat (limited to 'distrib/sdl-1.2.15/src/thread/riscos/SDL_syssem.c')
| -rw-r--r-- | distrib/sdl-1.2.15/src/thread/riscos/SDL_syssem.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.15/src/thread/riscos/SDL_syssem.c b/distrib/sdl-1.2.15/src/thread/riscos/SDL_syssem.c new file mode 100644 index 0000000..127211b --- /dev/null +++ b/distrib/sdl-1.2.15/src/thread/riscos/SDL_syssem.c @@ -0,0 +1,203 @@ +/* + SDL - Simple DirectMedia Layer + Copyright (C) 1997-2012 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 <errno.h> + +#include "SDL_config.h" + +/* RISC OS semiphores based on linux code */ + + +#include "SDL_timer.h" +#include "SDL_thread.h" +#include "SDL_systhread_c.h" + +#if !SDL_THREADS_DISABLED + +SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) +{ + SDL_SetError("SDL not configured with thread support"); + return (SDL_sem *)0; +} + +void SDL_DestroySemaphore(SDL_sem *sem) +{ + return; +} + +int SDL_SemTryWait(SDL_sem *sem) +{ + SDL_SetError("SDL not configured with thread support"); + return -1; +} + +int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) +{ + SDL_SetError("SDL not configured with thread support"); + return -1; +} + +int SDL_SemWait(SDL_sem *sem) +{ + SDL_SetError("SDL not configured with thread support"); + return -1; +} + +Uint32 SDL_SemValue(SDL_sem *sem) +{ + return 0; +} + +int SDL_SemPost(SDL_sem *sem) +{ + SDL_SetError("SDL not configured with thread support"); + return -1; +} + +#else + + +#include <unistd.h> /* For getpid() */ +#include <pthread.h> +#include <semaphore.h> + +struct SDL_semaphore { + sem_t *sem; + sem_t sem_data; +}; + +/* 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_data, 0, initial_value) < 0 ) { + SDL_SetError("sem_init() failed"); + SDL_free(sem); + sem = NULL; + } else { + sem->sem = &sem->sem_data; + } + } 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... */ + 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 /* !SDL_THREADS_DISABLED */ |