src/thread/pthread/SDL_systls.c
author Philipp Wiesemann <philipp.wiesemann@arcor.de>
Wed, 16 Nov 2016 22:08:51 +0100
changeset 10617 346c02ff71b6
parent 10609 d702ecbd8ba7
child 10737 3406a0f8b041
permissions -rw-r--r--
Fixed empty parameter list in signatures of internal functions.
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2016 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 
    31 static pthread_key_t thread_local_storage = INVALID_PTHREAD_KEY;
    32 static SDL_bool generic_local_storage = SDL_FALSE;
    33 
    34 SDL_TLSData *
    35 SDL_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 
    58 int
    59 SDL_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: */