diff options
Diffstat (limited to 'distrib/sdl-1.2.12/src/thread/amigaos/SDL_syssem.c')
-rw-r--r-- | distrib/sdl-1.2.12/src/thread/amigaos/SDL_syssem.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.12/src/thread/amigaos/SDL_syssem.c b/distrib/sdl-1.2.12/src/thread/amigaos/SDL_syssem.c new file mode 100644 index 0000000..a31a213 --- /dev/null +++ b/distrib/sdl-1.2.12/src/thread/amigaos/SDL_syssem.c @@ -0,0 +1,148 @@ +/* + 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" + +/* An implementation of semaphores using mutexes and condition variables */ + +#include "SDL_thread.h" +#include "SDL_systhread_c.h" + + +struct SDL_semaphore +{ + struct SignalSemaphore Sem; +}; + +#undef D + +#define D(x) + +SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) +{ + SDL_sem *sem; + + sem = (SDL_sem *)SDL_malloc(sizeof(*sem)); + + if ( ! sem ) { + SDL_OutOfMemory(); + return(0); + } + + D(bug("Creating semaphore %lx...\n",sem)); + + SDL_memset(sem,0,sizeof(*sem)); + + InitSemaphore(&sem->Sem); + + return(sem); +} + +void SDL_DestroySemaphore(SDL_sem *sem) +{ + D(bug("Destroying semaphore %lx...\n",sem)); + + if ( sem ) { +// Condizioni per liberare i task in attesa? + SDL_free(sem); + } +} + +int SDL_SemTryWait(SDL_sem *sem) +{ + if ( ! sem ) { + SDL_SetError("Passed a NULL semaphore"); + return -1; + } + + D(bug("TryWait semaphore...%lx\n",sem)); + + ObtainSemaphore(&sem->Sem); +// ReleaseSemaphore(&sem->Sem); + + return 1; +} + +int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) +{ + int retval; + + + if ( ! sem ) { + SDL_SetError("Passed a NULL semaphore"); + return -1; + } + + D(bug("WaitTimeout (%ld) semaphore...%lx\n",timeout,sem)); + + /* A timeout of 0 is an easy case */ + if ( timeout == 0 ) { + ObtainSemaphore(&sem->Sem); + return 1; + } + if(!(retval=AttemptSemaphore(&sem->Sem))) + { + SDL_Delay(timeout); + retval=AttemptSemaphore(&sem->Sem); + } + + if(retval==TRUE) + { +// ReleaseSemaphore(&sem->Sem); + retval=1; + } + + return retval; +} + +int SDL_SemWait(SDL_sem *sem) +{ + ObtainSemaphore(&sem->Sem); + return 0; +} + +Uint32 SDL_SemValue(SDL_sem *sem) +{ + Uint32 value; + + value = 0; + if ( sem ) { + #ifdef STORMC4_WOS + value = sem->Sem.ssppc_SS.ss_NestCount; + #else + value = sem->Sem.ss_NestCount; + #endif + } + return value; +} + +int SDL_SemPost(SDL_sem *sem) +{ + if ( ! sem ) { + SDL_SetError("Passed a NULL semaphore"); + return -1; + } + D(bug("SemPost semaphore...%lx\n",sem)); + + ReleaseSemaphore(&sem->Sem); + return 0; +} + |