Atlas - SDL_sysmutex.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_PSP
24
25// An implementation of mutexes using semaphores
26
27#include "SDL_systhread_c.h"
28
29#include <pspthreadman.h>
30#include <pspkerror.h>
31
32#define SCE_KERNEL_MUTEX_ATTR_RECURSIVE 0x0200U
33
34struct SDL_Mutex
35{
36    SceLwMutexWorkarea lock;
37};
38
39SDL_Mutex *SDL_CreateMutex(void)
40{
41    SDL_Mutex *mutex = (SDL_Mutex *)SDL_malloc(sizeof(*mutex));
42    if (mutex) {
43        const SceInt32 res = sceKernelCreateLwMutex(
44            &mutex->lock,
45            "SDL mutex",
46            SCE_KERNEL_MUTEX_ATTR_RECURSIVE,
47            0,
48            NULL);
49
50        if (res < 0) {
51            SDL_free(mutex);
52            mutex = NULL;
53            SDL_SetError("Error trying to create mutex: %lx", res);
54        }
55    }
56    return mutex;
57}
58
59void SDL_DestroyMutex(SDL_Mutex *mutex)
60{
61    if (mutex) {
62        sceKernelDeleteLwMutex(&mutex->lock);
63        SDL_free(mutex);
64    }
65}
66
67void SDL_LockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS  // clang doesn't know about NULL mutexes
68{
69    if (mutex) {
70        const SceInt32 res = sceKernelLockLwMutex(&mutex->lock, 1, NULL);
71        SDL_assert(res == SCE_KERNEL_ERROR_OK);  // assume we're in a lot of trouble if this assert fails.
72    }
73}
74
75bool SDL_TryLockMutex(SDL_Mutex *mutex)
76{
77    bool result = true;
78    if (mutex) {
79        const SceInt32 res = sceKernelTryLockLwMutex(&mutex->lock, 1);
80        if (res == SCE_KERNEL_ERROR_OK) {
81            result = true;
82        } else if (res == SCE_KERNEL_ERROR_WAIT_TIMEOUT) {
83            result = false;
84        } else {
85            SDL_assert(res == SCE_KERNEL_ERROR_OK);  // assume we're in a lot of trouble if this assert fails.
86            result = false;
87        }
88    }
89    return result;
90}
91
92void SDL_UnlockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS  // clang doesn't know about NULL mutexes
93{
94    if (mutex) {
95        const SceInt32 res = sceKernelUnlockLwMutex(&mutex->lock, 1);
96        SDL_assert(res == SCE_KERNEL_ERROR_OK);  // assume we're in a lot of trouble if this assert fails.
97    }
98}
99
100#endif // SDL_THREAD_PSP
101
[FILE END]
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