src/thread/windows/SDL_systls.c
author Sam Lantinga <slouken@libsdl.org>
Tue, 19 Mar 2019 17:20:54 -0700
changeset 12668 dd6b61160cdc
parent 12667 4891e138886a
permissions -rw-r--r--
Hopefully fixed the mingw32 build
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2019 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;
    44 static SDL_bool generic_local_storage = SDL_FALSE;
    45 
    46 SDL_TLSData *
    47 SDL_SYS_GetTLSData(void)
    48 {
    49     if (thread_local_storage == TLS_OUT_OF_INDEXES && !generic_local_storage) {
    50         static SDL_SpinLock lock;
    51         SDL_AtomicLock(&lock);
    52         if (thread_local_storage == TLS_OUT_OF_INDEXES && !generic_local_storage) {
    53             DWORD storage = TlsAlloc();
    54             if (storage != TLS_OUT_OF_INDEXES) {
    55                 SDL_MemoryBarrierRelease();
    56                 thread_local_storage = storage;
    57             } else {
    58                 generic_local_storage = SDL_TRUE;
    59             }
    60         }
    61         SDL_AtomicUnlock(&lock);
    62     }
    63     if (generic_local_storage) {
    64         return SDL_Generic_GetTLSData();
    65     }
    66     SDL_MemoryBarrierAcquire();
    67     return (SDL_TLSData *)TlsGetValue(thread_local_storage);
    68 }
    69 
    70 int
    71 SDL_SYS_SetTLSData(SDL_TLSData *data)
    72 {
    73     if (generic_local_storage) {
    74         return SDL_Generic_SetTLSData(data);
    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: */