This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
SDL_syssem.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
/*
Simple DirectMedia Layer
Copyright (C) 1997-2013 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.
*/
/* 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 {
34
SceUID semid;
35
36
37
38
39
40
};
/* Create a semaphore */
SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
{
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
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;
57
58
59
60
61
}
/* Free the semaphore */
void SDL_DestroySemaphore(SDL_sem *sem)
{
62
63
64
65
66
67
68
69
if (sem != NULL) {
if (sem->semid > 0) {
sceKernelDeleteSema(sem->semid);
sem->semid = 0;
}
free(sem);
}
70
71
72
73
74
75
76
77
}
/* 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)
{
78
Uint32 *pTimeout;
79
80
unsigned int res;
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
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);
102
103
104
105
106
107
switch (res) {
case SCE_KERNEL_ERROR_OK:
return 0;
case SCE_KERNEL_ERROR_WAIT_TIMEOUT:
return SDL_MUTEX_TIMEDOUT;
default:
108
return SDL_SetError("WaitForSingleObject() failed");
110
111
112
113
}
int SDL_SemTryWait(SDL_sem *sem)
{
114
return SDL_SemWaitTimeout(sem, 0);
115
116
117
118
}
int SDL_SemWait(SDL_sem *sem)
{
119
return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
120
121
122
123
124
}
/* Returns the current count of the semaphore */
Uint32 SDL_SemValue(SDL_sem *sem)
{
125
SceKernelSemaInfo info;
127
128
129
130
if (sem == NULL) {
SDL_SetError("Passed a NULL sem");
return 0;
}
132
133
134
if (sceKernelReferSemaStatus(sem->semid, &info) >= 0) {
return info.currentCount;
}
136
return 0;
137
138
139
140
}
int SDL_SemPost(SDL_sem *sem)
{
141
int res;
143
144
145
if (sem == NULL) {
return SDL_SetError("Passed a NULL sem");
}
147
148
149
150
res = sceKernelSignalSema(sem->semid, 1);
if (res < 0) {
return SDL_SetError("sceKernelSignalSema() failed");
}
152
return 0;
153
154
155
156
}
/* vim: ts=4 sw=4
*/