Atlas - SDL_systhread.c
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[FILE BEGIN]
1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2026 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_N3DS
24
25// Thread management routines for SDL
26
27#include "../SDL_systhread.h"
28
29// N3DS has very limited RAM (128MB), so we set a low default thread stack size.
30#define N3DS_THREAD_STACK_SIZE_DEFAULT (80 * 1024)
31
32#define N3DS_THREAD_PRIORITY_LOW           0x3F /**< Minimum priority */
33#define N3DS_THREAD_PRIORITY_MEDIUM        0x2F /**< Slightly higher than main thread (0x30) */
34#define N3DS_THREAD_PRIORITY_HIGH          0x19 /**< High priority for non-video work */
35#define N3DS_THREAD_PRIORITY_TIME_CRITICAL 0x18 /**< Highest priority */
36
37static size_t GetStackSize(size_t requested_size);
38
39static void ThreadEntry(void *arg)
40{
41    SDL_RunThread((SDL_Thread *)arg);
42    threadExit(0);
43}
44
45bool SDL_SYS_CreateThread(SDL_Thread *thread,
46                          SDL_FunctionPointer pfnBeginThread,
47                          SDL_FunctionPointer pfnEndThread)
48{
49    s32 priority = 0x30;
50    int cpu = -1;
51    size_t stack_size = GetStackSize(thread->stacksize);
52
53    svcGetThreadPriority(&priority, CUR_THREAD_HANDLE);
54
55    // on New 3DS, prefer putting audio thread on system core
56    if (thread->name && (SDL_strncmp(thread->name, "SDLAudioP", 9) == 0)) {
57        bool new3ds = false;
58        APT_CheckNew3DS(&new3ds);
59        if (new3ds && R_SUCCEEDED(APT_SetAppCpuTimeLimit(30))) {
60            cpu = 1;
61        }
62    }
63
64    thread->handle = threadCreate(ThreadEntry,
65                                  thread,
66                                  stack_size,
67                                  priority,
68                                  cpu,
69                                  false);
70
71    if (!thread->handle) {
72        return SDL_SetError("Couldn't create thread");
73    }
74
75    return true;
76}
77
78static size_t GetStackSize(size_t requested_size)
79{
80    if (requested_size == 0) {
81        return N3DS_THREAD_STACK_SIZE_DEFAULT;
82    }
83
84    return requested_size;
85}
86
87void SDL_SYS_SetupThread(const char *name)
88{
89    return;
90}
91
92SDL_ThreadID SDL_GetCurrentThreadID(void)
93{
94    u32 thread_ID = 0;
95    svcGetThreadId(&thread_ID, CUR_THREAD_HANDLE);
96    return (SDL_ThreadID)thread_ID;
97}
98
99bool SDL_SYS_SetThreadPriority(SDL_ThreadPriority sdl_priority)
100{
101    s32 svc_priority;
102    switch (sdl_priority) {
103    case SDL_THREAD_PRIORITY_LOW:
104        svc_priority = N3DS_THREAD_PRIORITY_LOW;
105        break;
106    case SDL_THREAD_PRIORITY_NORMAL:
107        svc_priority = N3DS_THREAD_PRIORITY_MEDIUM;
108        break;
109    case SDL_THREAD_PRIORITY_HIGH:
110        svc_priority = N3DS_THREAD_PRIORITY_HIGH;
111        break;
112    case SDL_THREAD_PRIORITY_TIME_CRITICAL:
113        svc_priority = N3DS_THREAD_PRIORITY_TIME_CRITICAL;
114        break;
115    default:
116        svc_priority = N3DS_THREAD_PRIORITY_MEDIUM;
117    }
118    if (svcSetThreadPriority(CUR_THREAD_HANDLE, svc_priority) < 0) {
119        return SDL_SetError("svcSetThreadPriority failed");
120    }
121    return true;
122}
123
124void SDL_SYS_WaitThread(SDL_Thread *thread)
125{
126    Result res = threadJoin(thread->handle, U64_MAX);
127
128    /*
129      Detached threads can be waited on, but should NOT be cleaned manually
130      as it would result in a fatal error.
131    */
132    if (R_SUCCEEDED(res) && SDL_GetThreadState(thread) != SDL_THREAD_DETACHED) {
133        threadFree(thread->handle);
134    }
135}
136
137void SDL_SYS_DetachThread(SDL_Thread *thread)
138{
139    threadDetach(thread->handle);
140}
141
142#endif // SDL_THREAD_N3DS
143
[FILE END]
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