Atlas - SDL_syssem.c
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1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 Sam Lantinga <[email protected]>
4
5  This software is provided 'as-is', without any express or implied
6  warranty.  In no event will the authors be held liable for any damages
7  arising from the use of this software.
8
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12
13  1. The origin of this software must not be misrepresented; you must not
14     claim that you wrote the original software. If you use this software
15     in a product, an acknowledgment in the product documentation would be
16     appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18     misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20*/
21#include "../../SDL_internal.h"
22
23#if SDL_THREAD_PSP
24
25/* Semaphore functions for the PSP. */
26
27#include <stdio.h>
28#include <stdlib.h>
29
30#include "SDL_error.h"
31#include "SDL_thread.h"
32
33#include <pspthreadman.h>
34#include <pspkerror.h>
35
36struct SDL_semaphore {
37    SceUID  semid;
38};
39
40
41/* Create a semaphore */
42SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
43{
44    SDL_sem *sem;
45
46    sem = (SDL_sem *) malloc(sizeof(*sem));
47    if (sem != NULL) {
48        /* TODO: Figure out the limit on the maximum value. */
49        sem->semid = sceKernelCreateSema("SDL sema", 0, initial_value, 255, NULL);
50        if (sem->semid < 0) {
51            SDL_SetError("Couldn't create semaphore");
52            free(sem);
53            sem = NULL;
54        }
55    } else {
56        SDL_OutOfMemory();
57    }
58
59    return sem;
60}
61
62/* Free the semaphore */
63void SDL_DestroySemaphore(SDL_sem *sem)
64{
65    if (sem != NULL) {
66        if (sem->semid > 0) {
67            sceKernelDeleteSema(sem->semid);
68            sem->semid = 0;
69        }
70
71        free(sem);
72    }
73}
74
75/* TODO: This routine is a bit overloaded.
76 * If the timeout is 0 then just poll the semaphore; if it's SDL_MUTEX_MAXWAIT, pass
77 * NULL to sceKernelWaitSema() so that it waits indefinitely; and if the timeout
78 * is specified, convert it to microseconds. */
79int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
80{
81    Uint32 *pTimeout;
82    int res;
83
84    if (sem == NULL) {
85        SDL_SetError("Passed a NULL sem");
86        return 0;
87    }
88
89    if (timeout == 0) {
90        res = sceKernelPollSema(sem->semid, 1);
91        if (res < 0) {
92            return SDL_MUTEX_TIMEDOUT;
93        }
94        return 0;
95    }
96
97    if (timeout == SDL_MUTEX_MAXWAIT) {
98        pTimeout = NULL;
99    } else {
100        timeout *= 1000;  /* Convert to microseconds. */
101        pTimeout = &timeout;
102    }
103
104    res = sceKernelWaitSema(sem->semid, 1, pTimeout);
105       switch (res) {
106               case SCE_KERNEL_ERROR_OK:
107                       return 0;
108               case SCE_KERNEL_ERROR_WAIT_TIMEOUT:
109                       return SDL_MUTEX_TIMEDOUT;
110               default:
111                       return SDL_SetError("sceKernelWaitSema() failed");
112    }
113}
114
115int SDL_SemTryWait(SDL_sem *sem)
116{
117    return SDL_SemWaitTimeout(sem, 0);
118}
119
120int SDL_SemWait(SDL_sem *sem)
121{
122    return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
123}
124
125/* Returns the current count of the semaphore */
126Uint32 SDL_SemValue(SDL_sem *sem)
127{
128    SceKernelSemaInfo info;
129
130    if (sem == NULL) {
131        SDL_SetError("Passed a NULL sem");
132        return 0;
133    }
134
135    if (sceKernelReferSemaStatus(sem->semid, &info) >= 0) {
136        return info.currentCount;
137    }
138
139    return 0;
140}
141
142int SDL_SemPost(SDL_sem *sem)
143{
144    int res;
145
146    if (sem == NULL) {
147        return SDL_SetError("Passed a NULL sem");
148    }
149
150    res = sceKernelSignalSema(sem->semid, 1);
151    if (res < 0) {
152        return SDL_SetError("sceKernelSignalSema() failed");
153    }
154
155    return 0;
156}
157
158#endif /* SDL_THREAD_PSP */
159
160/* vim: ts=4 sw=4
161 */
162
[FILE END]
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