Atlas - SDL_systhread.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_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
45
46bool SDL_SYS_CreateThread(SDL_Thread *thread,
47                          SDL_FunctionPointer pfnBeginThread,
48                          SDL_FunctionPointer pfnEndThread)
49{
50    s32 priority = 0x30;
51    int cpu = -1;
52    size_t stack_size = GetStackSize(thread->stacksize);
53
54    svcGetThreadPriority(&priority, CUR_THREAD_HANDLE);
55
56    // prefer putting audio thread on system core
57    if (thread->name && (SDL_strncmp(thread->name, "SDLAudioP", 9) == 0) && R_SUCCEEDED(APT_SetAppCpuTimeLimit(30))) {
58        cpu = 1;
59    }
60
61    thread->handle = threadCreate(ThreadEntry,
62                                  thread,
63                                  stack_size,
64                                  priority,
65                                  cpu,
66                                  false);
67
68    if (!thread->handle) {
69        return SDL_SetError("Couldn't create thread");
70    }
71
72    return true;
73}
74
75static size_t GetStackSize(size_t requested_size)
76{
77    if (requested_size == 0) {
78        return N3DS_THREAD_STACK_SIZE_DEFAULT;
79    }
80
81    return requested_size;
82}
83
84void SDL_SYS_SetupThread(const char *name)
85{
86    return;
87}
88
89SDL_ThreadID SDL_GetCurrentThreadID(void)
90{
91    u32 thread_ID = 0;
92    svcGetThreadId(&thread_ID, CUR_THREAD_HANDLE);
93    return (SDL_ThreadID)thread_ID;
94}
95
96bool SDL_SYS_SetThreadPriority(SDL_ThreadPriority sdl_priority)
97{
98    s32 svc_priority;
99    switch (sdl_priority) {
100    case SDL_THREAD_PRIORITY_LOW:
101        svc_priority = N3DS_THREAD_PRIORITY_LOW;
102        break;
103    case SDL_THREAD_PRIORITY_NORMAL:
104        svc_priority = N3DS_THREAD_PRIORITY_MEDIUM;
105        break;
106    case SDL_THREAD_PRIORITY_HIGH:
107        svc_priority = N3DS_THREAD_PRIORITY_HIGH;
108        break;
109    case SDL_THREAD_PRIORITY_TIME_CRITICAL:
110        svc_priority = N3DS_THREAD_PRIORITY_TIME_CRITICAL;
111        break;
112    default:
113        svc_priority = N3DS_THREAD_PRIORITY_MEDIUM;
114    }
115    if (svcSetThreadPriority(CUR_THREAD_HANDLE, svc_priority) < 0) {
116        return SDL_SetError("svcSetThreadPriority failed");
117    }
118    return true;
119}
120
121void SDL_SYS_WaitThread(SDL_Thread *thread)
122{
123    Result res = threadJoin(thread->handle, U64_MAX);
124
125    /*
126      Detached threads can be waited on, but should NOT be cleaned manually
127      as it would result in a fatal error.
128    */
129    if (R_SUCCEEDED(res) && SDL_GetThreadState(thread) != SDL_THREAD_DETACHED) {
130        threadFree(thread->handle);
131    }
132}
133
134void SDL_SYS_DetachThread(SDL_Thread *thread)
135{
136    threadDetach(thread->handle);
137}
138
139#endif // SDL_THREAD_N3DS
140
[FILE END]
(C) 2025 0x4248
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