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_DOS
24
25/* DOS thread management routines for SDL — cooperative threading via
26   the DOS mini-scheduler (no OS-level threads on DOS). */
27
28#include "../../core/dos/SDL_dos_scheduler.h"
29#include "../SDL_systhread.h"
30#include "../SDL_thread_c.h"
31
32static int ThreadEntry(void *arg)
33{
34    SDL_Thread *thread = (SDL_Thread *)arg;
35    SDL_RunThread(thread);
36    return 0;
37}
38
39bool SDL_SYS_CreateThread(SDL_Thread *thread,
40                          SDL_FunctionPointer pfnBeginThread,
41                          SDL_FunctionPointer pfnEndThread)
42{
43    /* Ensure the scheduler is initialized (idempotent) */
44    DOS_SchedulerInit();
45
46    size_t stack_size = thread->stacksize;
47
48    int tid = DOS_CreateThread(ThreadEntry, thread, stack_size);
49    if (tid < 0) {
50        return SDL_SetError("DOS_CreateThread() failed — no free thread slots");
51    }
52
53    thread->handle = tid;
54    return true;
55}
56
57void SDL_SYS_SetupThread(const char *name)
58{
59    /* Nothing to do on DOS */
60}
61
62SDL_ThreadID SDL_GetCurrentThreadID(void)
63{
64    return (SDL_ThreadID)DOS_GetCurrentThreadID();
65}
66
67void SDL_SYS_WaitThread(SDL_Thread *thread)
68{
69    DOS_JoinThread(thread->handle);
70    DOS_DestroyThread(thread->handle);
71}
72
73void SDL_SYS_DetachThread(SDL_Thread *thread)
74{
75    /* For cooperative threads, detach is a no-op. The thread will clean
76       itself up when it finishes. In practice, SDL's thread code handles
77       the detach lifecycle via atomics in SDL_RunThread. */
78}
79
80bool SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
81{
82    /* DOS cooperative scheduler uses round-robin — priority is not
83       meaningful. Accept any value without error. */
84    return true;
85}
86
87#endif /* SDL_THREAD_DOS */
88
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