160 lines
3.5 KiB
C
Executable File
160 lines
3.5 KiB
C
Executable File
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../../SDL_internal.h"
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#if SDL_THREAD_PS2
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/* Semaphore functions for the PS2. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <timer_alarm.h>
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#include "SDL_error.h"
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#include "SDL_thread.h"
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#include <kernel.h>
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struct SDL_semaphore {
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s32 semid;
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};
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static void usercb(struct timer_alarm_t *alarm, void *arg) {
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iReleaseWaitThread((int)arg);
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}
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/* Create a semaphore */
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SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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{
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SDL_sem *sem;
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ee_sema_t sema;
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sem = (SDL_sem *) SDL_malloc(sizeof(*sem));
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if (sem != NULL) {
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/* TODO: Figure out the limit on the maximum value. */
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sema.init_count = initial_value;
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sema.max_count = 255;
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sema.option = 0;
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sem->semid = CreateSema(&sema);
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if (sem->semid < 0) {
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SDL_SetError("Couldn't create semaphore");
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SDL_free(sem);
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sem = NULL;
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}
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} else {
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SDL_OutOfMemory();
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}
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return sem;
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}
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/* Free the semaphore */
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void SDL_DestroySemaphore(SDL_sem *sem)
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{
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if (sem != NULL) {
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if (sem->semid > 0) {
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DeleteSema(sem->semid);
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sem->semid = 0;
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}
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SDL_free(sem);
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}
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}
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int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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{
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int ret;
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struct timer_alarm_t alarm;
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InitializeTimerAlarm(&alarm);
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if (sem == NULL) {
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SDL_InvalidParamError("sem");
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return 0;
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}
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if (timeout == 0) {
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if (PollSema(sem->semid) < 0) {
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return SDL_MUTEX_TIMEDOUT;
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}
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return 0;
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}
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if (timeout != SDL_MUTEX_MAXWAIT) {
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SetTimerAlarm(&alarm, MSec2TimerBusClock(timeout), &usercb, (void *)GetThreadId());
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}
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ret = WaitSema(sem->semid);
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StopTimerAlarm(&alarm);
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if (ret < 0)
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return SDL_MUTEX_TIMEDOUT;
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return 0; //Wait condition satisfied.
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}
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int SDL_SemTryWait(SDL_sem *sem)
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{
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return SDL_SemWaitTimeout(sem, 0);
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}
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int SDL_SemWait(SDL_sem *sem)
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{
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return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
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}
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/* Returns the current count of the semaphore */
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Uint32 SDL_SemValue(SDL_sem *sem)
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{
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ee_sema_t info;
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if (sem == NULL) {
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SDL_InvalidParamError("sem");
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return 0;
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}
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if (ReferSemaStatus(sem->semid, &info) >= 0) {
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return info.count;
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}
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return 0;
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}
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int SDL_SemPost(SDL_sem *sem)
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{
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int res;
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if (sem == NULL) {
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return SDL_InvalidParamError("sem");
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}
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res = SignalSema(sem->semid);
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if (res < 0) {
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return SDL_SetError("sceKernelSignalSema() failed");
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}
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return 0;
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}
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#endif /* SDL_THREAD_PS2 */
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/* vim: ts=4 sw=4
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*/
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