1/*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org>
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#include "SDL_thread.h"
23#include "../SDL_systhread.h"
24#include "../SDL_thread_c.h"
25
26#include <pthread.h>
27
28
29#define INVALID_PTHREAD_KEY ((pthread_key_t)-1)
30
31static pthread_key_t thread_local_storage = INVALID_PTHREAD_KEY;
32static SDL_bool generic_local_storage = SDL_FALSE;
33
34SDL_TLSData *
35SDL_SYS_GetTLSData(void)
36{
37 if (thread_local_storage == INVALID_PTHREAD_KEY && !generic_local_storage) {
38 static SDL_SpinLock lock;
39 SDL_AtomicLock(&lock);
40 if (thread_local_storage == INVALID_PTHREAD_KEY && !generic_local_storage) {
41 pthread_key_t storage;
42 if (pthread_key_create(&storage, NULL) == 0) {
43 SDL_MemoryBarrierRelease();
44 thread_local_storage = storage;
45 } else {
46 generic_local_storage = SDL_TRUE;
47 }
48 }
49 SDL_AtomicUnlock(&lock);
50 }
51 if (generic_local_storage) {
52 return SDL_Generic_GetTLSData();
53 }
54 SDL_MemoryBarrierAcquire();
55 return (SDL_TLSData *)pthread_getspecific(thread_local_storage);
56}
57
58int
59SDL_SYS_SetTLSData(SDL_TLSData *data)
60{
61 if (generic_local_storage) {
62 return SDL_Generic_SetTLSData(data);
63 }
64 if (pthread_setspecific(thread_local_storage, data) != 0) {
65 return SDL_SetError("pthread_setspecific() failed");
66 }
67 return 0;
68}
69
70/* vi: set ts=4 sw=4 expandtab: */
71