Atlas - SDL_syssem.c
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[FILE BEGIN]
1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2025 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#ifdef SDL_THREAD_VITA
24
25// Semaphore functions for the VITA.
26
27#include <stdio.h>
28#include <stdlib.h>
29
30#include <psp2/types.h>
31#include <psp2/kernel/error.h>
32#include <psp2/kernel/threadmgr.h>
33
34struct SDL_Semaphore
35{
36    SceUID semid;
37};
38
39// Create a semaphore
40SDL_Semaphore *SDL_CreateSemaphore(Uint32 initial_value)
41{
42    SDL_Semaphore *sem;
43
44    sem = (SDL_Semaphore *)SDL_malloc(sizeof(*sem));
45    if (sem) {
46        // TODO: Figure out the limit on the maximum value.
47        sem->semid = sceKernelCreateSema("SDL sema", 0, initial_value, 255, NULL);
48        if (sem->semid < 0) {
49            SDL_SetError("Couldn't create semaphore");
50            SDL_free(sem);
51            sem = NULL;
52        }
53    }
54
55    return sem;
56}
57
58// Free the semaphore
59void SDL_DestroySemaphore(SDL_Semaphore *sem)
60{
61    if (sem) {
62        if (sem->semid > 0) {
63            sceKernelDeleteSema(sem->semid);
64            sem->semid = 0;
65        }
66
67        SDL_free(sem);
68    }
69}
70
71/* TODO: This routine is a bit overloaded.
72 * If the timeout is 0 then just poll the semaphore; if it's -1, pass
73 * NULL to sceKernelWaitSema() so that it waits indefinitely; and if the timeout
74 * is specified, convert it to microseconds. */
75bool SDL_WaitSemaphoreTimeoutNS(SDL_Semaphore *sem, Sint64 timeoutNS)
76{
77    SceUInt timeoutUS;
78    SceUInt *pTimeout = NULL;
79
80    if (!sem) {
81        return true;
82    }
83
84    if (timeoutNS == 0) {
85        return (sceKernelPollSema(sem->semid, 1) == 0);
86    }
87
88    if (timeoutNS > 0) {
89        timeoutUS = (SceUInt)SDL_NS_TO_US(timeoutNS); // Convert to microseconds.
90        pTimeout = &timeoutUS;
91    }
92
93    return (sceKernelWaitSema(sem->semid, 1, pTimeout) == 0);
94}
95
96// Returns the current count of the semaphore
97Uint32 SDL_GetSemaphoreValue(SDL_Semaphore *sem)
98{
99    SceKernelSemaInfo info;
100    info.size = sizeof(info);
101
102    if (!sem) {
103        return 0;
104    }
105
106    if (sceKernelGetSemaInfo(sem->semid, &info) >= 0) {
107        return info.currentCount;
108    }
109
110    return 0;
111}
112
113void SDL_SignalSemaphore(SDL_Semaphore *sem)
114{
115    if (!sem) {
116        return;
117    }
118
119    sceKernelSignalSema(sem->semid, 1);
120}
121
122#endif // SDL_THREAD_VITA
123
[FILE END]
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