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_PS2
24
25// Semaphore functions for the PS2.
26
27#include <stdio.h>
28#include <stdlib.h>
29#include <kernel_util.h>
30
31#include <kernel.h>
32
33struct SDL_Semaphore
34{
35    s32 semid;
36};
37
38// Create a semaphore
39SDL_Semaphore *SDL_CreateSemaphore(Uint32 initial_value)
40{
41    SDL_Semaphore *sem;
42    ee_sema_t sema;
43
44    sem = (SDL_Semaphore *)SDL_malloc(sizeof(*sem));
45    if (sem) {
46        // TODO: Figure out the limit on the maximum value.
47        sema.init_count = initial_value;
48        sema.max_count = 255;
49        sema.option = 0;
50        sem->semid = CreateSema(&sema);
51
52        if (sem->semid < 0) {
53            SDL_SetError("Couldn't create semaphore");
54            SDL_free(sem);
55            sem = NULL;
56        }
57    }
58
59    return sem;
60}
61
62// Free the semaphore
63void SDL_DestroySemaphore(SDL_Semaphore *sem)
64{
65    if (sem) {
66        if (sem->semid > 0) {
67            DeleteSema(sem->semid);
68            sem->semid = 0;
69        }
70
71        SDL_free(sem);
72    }
73}
74
75bool SDL_WaitSemaphoreTimeoutNS(SDL_Semaphore *sem, Sint64 timeoutNS)
76{
77    u64 timeout_usec;
78    u64 *timeout_ptr;
79
80    if (!sem) {
81        return true;
82    }
83
84    if (timeoutNS == 0) {
85        return (PollSema(sem->semid) == 0);
86    }
87
88    timeout_ptr = NULL;
89
90    if (timeoutNS != -1) {  // -1 == wait indefinitely.
91        timeout_usec = SDL_NS_TO_US(timeoutNS);
92        timeout_ptr = &timeout_usec;
93    }
94
95    return (WaitSemaEx(sem->semid, 1, timeout_ptr) == 0);
96}
97
98// Returns the current count of the semaphore
99Uint32 SDL_GetSemaphoreValue(SDL_Semaphore *sem)
100{
101    ee_sema_t info;
102
103    if (!sem) {
104        return 0;
105    }
106
107    if (ReferSemaStatus(sem->semid, &info) == 0) {
108        return info.count;
109    }
110    return 0;
111}
112
113void SDL_SignalSemaphore(SDL_Semaphore *sem)
114{
115    if (!sem) {
116        return;
117    }
118
119    SignalSema(sem->semid);
120}
121
122#endif // SDL_THREAD_PS2
123
[FILE END]
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