Atlas - SDL_systhread.c
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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// VITA thread management routines for SDL
26
27#include <stdio.h>
28#include <stdlib.h>
29
30#include "../SDL_systhread.h"
31#include "../SDL_thread_c.h"
32#include <psp2/types.h>
33#include <psp2/kernel/threadmgr.h>
34
35#define VITA_THREAD_STACK_SIZE_MIN     0x1000    // 4KiB
36#define VITA_THREAD_STACK_SIZE_MAX     0x2000000 // 32MiB
37#define VITA_THREAD_STACK_SIZE_DEFAULT 0x10000   // 64KiB
38#define VITA_THREAD_NAME_MAX           32
39
40#define VITA_THREAD_PRIORITY_LOW           191
41#define VITA_THREAD_PRIORITY_NORMAL        160
42#define VITA_THREAD_PRIORITY_HIGH          112
43#define VITA_THREAD_PRIORITY_TIME_CRITICAL 64
44
45static int ThreadEntry(SceSize args, void *argp)
46{
47    SDL_RunThread(*(SDL_Thread **)argp);
48    return 0;
49}
50
51bool SDL_SYS_CreateThread(SDL_Thread *thread,
52                          SDL_FunctionPointer pfnBeginThread,
53                          SDL_FunctionPointer pfnEndThread)
54
55{
56    char thread_name[VITA_THREAD_NAME_MAX];
57    size_t stack_size = VITA_THREAD_STACK_SIZE_DEFAULT;
58
59    SDL_strlcpy(thread_name, "SDL thread", VITA_THREAD_NAME_MAX);
60    if (thread->name) {
61        SDL_strlcpy(thread_name, thread->name, VITA_THREAD_NAME_MAX);
62    }
63
64    if (thread->stacksize) {
65        if (thread->stacksize < VITA_THREAD_STACK_SIZE_MIN) {
66            thread->stacksize = VITA_THREAD_STACK_SIZE_MIN;
67        }
68        if (thread->stacksize > VITA_THREAD_STACK_SIZE_MAX) {
69            thread->stacksize = VITA_THREAD_STACK_SIZE_MAX;
70        }
71        stack_size = thread->stacksize;
72    }
73
74    // Create new thread with the same priority as the current thread
75    thread->handle = sceKernelCreateThread(
76        thread_name, // name
77        ThreadEntry, // function to run
78        0,           // priority. 0 means priority of calling thread
79        stack_size,  // stack size
80        0,           // attributes. always 0
81        0,           // cpu affinity mask. 0 = all CPUs
82        NULL         // opt. always NULL
83    );
84
85    if (thread->handle < 0) {
86        return SDL_SetError("sceKernelCreateThread() failed");
87    }
88
89    sceKernelStartThread(thread->handle, 4, &thread);
90    return true;
91}
92
93void SDL_SYS_SetupThread(const char *name)
94{
95    // Do nothing.
96}
97
98SDL_ThreadID SDL_GetCurrentThreadID(void)
99{
100    return (SDL_ThreadID)sceKernelGetThreadId();
101}
102
103void SDL_SYS_WaitThread(SDL_Thread *thread)
104{
105    sceKernelWaitThreadEnd(thread->handle, NULL, NULL);
106    sceKernelDeleteThread(thread->handle);
107}
108
109void SDL_SYS_DetachThread(SDL_Thread *thread)
110{
111    // Do nothing.
112}
113
114bool SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
115{
116    int value = VITA_THREAD_PRIORITY_NORMAL;
117
118    switch (priority) {
119    case SDL_THREAD_PRIORITY_LOW:
120        value = VITA_THREAD_PRIORITY_LOW;
121        break;
122    case SDL_THREAD_PRIORITY_NORMAL:
123        value = VITA_THREAD_PRIORITY_NORMAL;
124        break;
125    case SDL_THREAD_PRIORITY_HIGH:
126        value = VITA_THREAD_PRIORITY_HIGH;
127        break;
128    case SDL_THREAD_PRIORITY_TIME_CRITICAL:
129        value = VITA_THREAD_PRIORITY_TIME_CRITICAL;
130        break;
131    }
132
133    if (sceKernelChangeThreadPriority(0, value) < 0) {
134        return SDL_SetError("sceKernelChangeThreadPriority() failed");
135    }
136    return true;
137}
138
139#endif // SDL_THREAD_VITA
140
[FILE END]
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