SDL  2.0
SDL_systls.c
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2020 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 
22 #include "../../SDL_internal.h"
23 
24 #if SDL_THREAD_WINDOWS
25 
26 #include "../../core/windows/SDL_windows.h"
27 
28 #include "SDL_thread.h"
29 #include "../SDL_thread_c.h"
30 
31 #if WINAPI_FAMILY_WINRT
32 #include <fibersapi.h>
33 
34 #ifndef TLS_OUT_OF_INDEXES
35 #define TLS_OUT_OF_INDEXES FLS_OUT_OF_INDEXES
36 #endif
37 
38 #define TlsAlloc() FlsAlloc(NULL)
39 #define TlsSetValue FlsSetValue
40 #define TlsGetValue FlsGetValue
41 #endif
42 
43 static DWORD thread_local_storage = TLS_OUT_OF_INDEXES;
45 
48 {
49  if (thread_local_storage == TLS_OUT_OF_INDEXES && !generic_local_storage) {
50  static SDL_SpinLock lock;
52  if (thread_local_storage == TLS_OUT_OF_INDEXES && !generic_local_storage) {
53  DWORD storage = TlsAlloc();
54  if (storage != TLS_OUT_OF_INDEXES) {
56  thread_local_storage = storage;
57  } else {
59  }
60  }
62  }
64  return SDL_Generic_GetTLSData();
65  }
67  return (SDL_TLSData *)TlsGetValue(thread_local_storage);
68 }
69 
70 int
72 {
75  }
76  if (!TlsSetValue(thread_local_storage, data)) {
77  return SDL_SetError("TlsSetValue() failed");
78  }
79  return 0;
80 }
81 
82 #endif /* SDL_THREAD_WINDOWS */
83 
84 /* vi: set ts=4 sw=4 expandtab: */
SDL_TLSData
Definition: SDL_thread_c.h:70
SDL_Generic_SetTLSData
int SDL_Generic_SetTLSData(SDL_TLSData *storage)
Definition: SDL_thread.c:163
SDL_MemoryBarrierRelease
#define SDL_MemoryBarrierRelease()
Definition: SDL_atomic.h:207
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_FALSE
@ SDL_FALSE
Definition: SDL_stdinc.h:163
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_SpinLock
int SDL_SpinLock
Definition: SDL_atomic.h:89
SDL_TRUE
@ SDL_TRUE
Definition: SDL_stdinc.h:164
SDL_SetError
#define SDL_SetError
Definition: SDL_dynapi_overrides.h:30
SDL_MemoryBarrierAcquire
#define SDL_MemoryBarrierAcquire()
Definition: SDL_atomic.h:208
SDL_Generic_GetTLSData
SDL_TLSData * SDL_Generic_GetTLSData(void)
Definition: SDL_thread.c:124
SDL_bool
SDL_bool
Definition: SDL_stdinc.h:161
lock
SDL_mutex * lock
Definition: SDL_events.c:83