SDL
2.0
SDL_systls.c
Go to the documentation of this file.
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/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../../SDL_internal.h"
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#include "
SDL_thread.h
"
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#include "../SDL_systhread.h"
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#include "../SDL_thread_c.h"
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#include <pthread.h>
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#define INVALID_PTHREAD_KEY ((pthread_key_t)-1)
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static
pthread_key_t
thread_local_storage
=
INVALID_PTHREAD_KEY
;
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static
SDL_bool
generic_local_storage
=
SDL_FALSE
;
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SDL_TLSData
*
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SDL_SYS_GetTLSData
(
void
)
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{
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if
(
thread_local_storage
==
INVALID_PTHREAD_KEY
&& !
generic_local_storage
) {
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static
SDL_SpinLock
lock
;
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SDL_AtomicLock
(&
lock
);
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if
(
thread_local_storage
==
INVALID_PTHREAD_KEY
&& !
generic_local_storage
) {
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pthread_key_t storage;
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if
(pthread_key_create(&storage,
NULL
) == 0) {
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SDL_MemoryBarrierRelease
();
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thread_local_storage
= storage;
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}
else
{
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generic_local_storage
=
SDL_TRUE
;
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}
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}
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SDL_AtomicUnlock
(&
lock
);
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}
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if
(
generic_local_storage
) {
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return
SDL_Generic_GetTLSData
();
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}
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SDL_MemoryBarrierAcquire
();
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return
(
SDL_TLSData
*)pthread_getspecific(
thread_local_storage
);
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}
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int
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SDL_SYS_SetTLSData
(
SDL_TLSData
*
data
)
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{
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if
(
generic_local_storage
) {
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return
SDL_Generic_SetTLSData
(
data
);
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}
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if
(pthread_setspecific(
thread_local_storage
,
data
) != 0) {
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return
SDL_SetError
(
"pthread_setspecific() failed"
);
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}
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return
0;
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}
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/* vi: set ts=4 sw=4 expandtab: */
INVALID_PTHREAD_KEY
#define INVALID_PTHREAD_KEY
Definition:
SDL_systls.c:29
SDL_TLSData
Definition:
SDL_thread_c.h:70
SDL_Generic_SetTLSData
int SDL_Generic_SetTLSData(SDL_TLSData *storage)
Definition:
SDL_thread.c:163
NULL
#define NULL
Definition:
begin_code.h:164
SDL_MemoryBarrierRelease
#define SDL_MemoryBarrierRelease()
Definition:
SDL_atomic.h:189
SDL_AtomicLock
#define SDL_AtomicLock
Definition:
SDL_dynapi_overrides.h:64
thread_local_storage
static pthread_key_t thread_local_storage
Definition:
SDL_systls.c:31
generic_local_storage
static SDL_bool generic_local_storage
Definition:
SDL_systls.c:32
data
GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * data
Definition:
SDL_opengl.h:1974
SDL_SYS_SetTLSData
int SDL_SYS_SetTLSData(SDL_TLSData *data)
Definition:
SDL_systls.c:33
SDL_thread.h
SDL_AtomicUnlock
#define SDL_AtomicUnlock
Definition:
SDL_dynapi_overrides.h:65
SDL_SYS_GetTLSData
SDL_TLSData * SDL_SYS_GetTLSData(void)
Definition:
SDL_systls.c:27
SDL_TRUE
@ SDL_TRUE
Definition:
SDL_stdinc.h:164
SDL_SpinLock
int SDL_SpinLock
Definition:
SDL_atomic.h:89
SDL_SetError
#define SDL_SetError
Definition:
SDL_dynapi_overrides.h:30
SDL_MemoryBarrierAcquire
#define SDL_MemoryBarrierAcquire()
Definition:
SDL_atomic.h:190
SDL_Generic_GetTLSData
SDL_TLSData * SDL_Generic_GetTLSData(void)
Definition:
SDL_thread.c:124
SDL_bool
SDL_bool
Definition:
SDL_stdinc.h:162
SDL_FALSE
@ SDL_FALSE
Definition:
SDL_stdinc.h:163
lock
SDL_mutex * lock
Definition:
SDL_events.c:78
src
thread
pthread
SDL_systls.c
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