SDL_syssem.c
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/*
Simple DirectMedia Layer
Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
#if SDL_THREAD_PSP
/* Semaphore functions for the PSP. */
#include <stdio.h>
#include <stdlib.h>
#include "SDL_error.h"
#include "SDL_thread.h"
#include <pspthreadman.h>
#include <pspkerror.h>
struct SDL_semaphore {
SceUID semid;
};
/* Create a semaphore */
SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
{
SDL_sem *sem;
sem = (SDL_sem *) malloc(sizeof(*sem));
if (sem != NULL) {
/* TODO: Figure out the limit on the maximum value. */
sem->semid = sceKernelCreateSema("SDL sema", 0, initial_value, 255, NULL);
if (sem->semid < 0) {
SDL_SetError("Couldn't create semaphore");
free(sem);
sem = NULL;
}
} else {
SDL_OutOfMemory();
}
return sem;
}
/* Free the semaphore */
void SDL_DestroySemaphore(SDL_sem *sem)
{
if (sem != NULL) {
if (sem->semid > 0) {
sceKernelDeleteSema(sem->semid);
sem->semid = 0;
}
free(sem);
}
}
/* TODO: This routine is a bit overloaded.
* If the timeout is 0 then just poll the semaphore; if it's SDL_MUTEX_MAXWAIT, pass
* NULL to sceKernelWaitSema() so that it waits indefinitely; and if the timeout
* is specified, convert it to microseconds. */
int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
{
Uint32 *pTimeout;
int res;
if (sem == NULL) {
SDL_SetError("Passed a NULL sem");
return 0;
}
if (timeout == 0) {
res = sceKernelPollSema(sem->semid, 1);
if (res < 0) {
return SDL_MUTEX_TIMEDOUT;
}
return 0;
}
if (timeout == SDL_MUTEX_MAXWAIT) {
pTimeout = NULL;
} else {
timeout *= 1000; /* Convert to microseconds. */
pTimeout = &timeout;
}
res = sceKernelWaitSema(sem->semid, 1, pTimeout);
switch (res) {
case SCE_KERNEL_ERROR_OK:
return 0;
case SCE_KERNEL_ERROR_WAIT_TIMEOUT:
return SDL_MUTEX_TIMEDOUT;
default:
return SDL_SetError("sceKernelWaitSema() failed");
}
}
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)
{
SceKernelSemaInfo info;
if (sem == NULL) {
SDL_SetError("Passed a NULL sem");
return 0;
}
if (sceKernelReferSemaStatus(sem->semid, &info) >= 0) {
return info.currentCount;
}
return 0;
}
int SDL_SemPost(SDL_sem *sem)
{
int res;
if (sem == NULL) {
return SDL_SetError("Passed a NULL sem");
}
res = sceKernelSignalSema(sem->semid, 1);
if (res < 0) {
return SDL_SetError("sceKernelSignalSema() failed");
}
return 0;
}
#endif /* SDL_THREAD_PSP */
/* vim: ts=4 sw=4
*/
free
SDL_EventEntry * free
Definition: SDL_events.c:84
Uint32
uint32_t Uint32
Definition: SDL_stdinc.h:181
SDL_SemPost
int SDL_SemPost(SDL_sem *sem)
Definition: SDL_syssem.c:200
SDL_MUTEX_TIMEDOUT
#define SDL_MUTEX_TIMEDOUT
Definition: SDL_mutex.h:44
SDL_thread.h
res
GLuint res
Definition: SDL_opengl_glext.h:7937
SDL_MUTEX_MAXWAIT
#define SDL_MUTEX_MAXWAIT
Definition: SDL_mutex.h:49
SDL_SemWaitTimeout
int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
Definition: SDL_syssem.c:150
SDL_SemTryWait
int SDL_SemTryWait(SDL_sem *sem)
Definition: SDL_syssem.c:130
SDL_SemWait
int SDL_SemWait(SDL_sem *sem)
Definition: SDL_syssem.c:180
SDL_semaphore
Definition: SDL_syssem.c:76
NULL
#define NULL
Definition: begin_code.h:164
SDL_OutOfMemory
#define SDL_OutOfMemory()
Definition: SDL_error.h:52
SDL_SetError
#define SDL_SetError
Definition: SDL_dynapi_overrides.h:30
SDL_SemValue
Uint32 SDL_SemValue(SDL_sem *sem)
Definition: SDL_syssem.c:186
timeout
GLbitfield GLuint64 timeout
Definition: SDL_opengl_glext.h:1483
SDL_semaphore::sem
sem_t sem
Definition: SDL_syssem.c:41
SDL_error.h
malloc
#define malloc
Definition: SDL_qsort.c:47
SDL_DestroySemaphore
void SDL_DestroySemaphore(SDL_sem *sem)
Definition: SDL_syssem.c:111
SDL_CreateSemaphore
SDL_sem * SDL_CreateSemaphore(Uint32 initial_value)
Definition: SDL_syssem.c:85