| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org> |
| |
| This software is provided 'as-is', without any express or implied |
| warranty. In no event will the authors be held liable for any damages |
| arising from the use of this software. |
| |
| Permission is granted to anyone to use this software for any purpose, |
| including commercial applications, and to alter it and redistribute it |
| freely, subject to the following restrictions: |
| |
| 1. The origin of this software must not be misrepresented; you must not |
| claim that you wrote the original software. If you use this software |
| in a product, an acknowledgment in the product documentation would be |
| appreciated but is not required. |
| 2. Altered source versions must be plainly marked as such, and must not be |
| misrepresented as being the original software. |
| 3. This notice may not be removed or altered from any source distribution. |
| */ |
| #include "../../SDL_internal.h" |
| #include "SDL_thread.h" |
| #include "../SDL_systhread.h" |
| #include "../SDL_thread_c.h" |
| |
| #include <pthread.h> |
| |
| |
| #define INVALID_PTHREAD_KEY ((pthread_key_t)-1) |
| |
| static pthread_key_t thread_local_storage = INVALID_PTHREAD_KEY; |
| static SDL_bool generic_local_storage = SDL_FALSE; |
| |
| SDL_TLSData * |
| SDL_SYS_GetTLSData(void) |
| { |
| if (thread_local_storage == INVALID_PTHREAD_KEY && !generic_local_storage) { |
| static SDL_SpinLock lock; |
| SDL_AtomicLock(&lock); |
| if (thread_local_storage == INVALID_PTHREAD_KEY && !generic_local_storage) { |
| pthread_key_t storage; |
| if (pthread_key_create(&storage, NULL) == 0) { |
| SDL_MemoryBarrierRelease(); |
| thread_local_storage = storage; |
| } else { |
| generic_local_storage = SDL_TRUE; |
| } |
| } |
| SDL_AtomicUnlock(&lock); |
| } |
| if (generic_local_storage) { |
| return SDL_Generic_GetTLSData(); |
| } |
| SDL_MemoryBarrierAcquire(); |
| return (SDL_TLSData *)pthread_getspecific(thread_local_storage); |
| } |
| |
| int |
| SDL_SYS_SetTLSData(SDL_TLSData *data) |
| { |
| if (generic_local_storage) { |
| return SDL_Generic_SetTLSData(data); |
| } |
| if (pthread_setspecific(thread_local_storage, data) != 0) { |
| return SDL_SetError("pthread_setspecific() failed"); |
| } |
| return 0; |
| } |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |