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      1 /*
      2  * Copyright 2013 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "SkTLS.h"
      9 #include "SkThread.h"
     10 
     11 static bool gOnce = false;
     12 static DWORD gTlsIndex;
     13 SK_DECLARE_STATIC_MUTEX(gMutex);
     14 
     15 void* SkTLS::PlatformGetSpecific(bool forceCreateTheSlot) {
     16     if (!forceCreateTheSlot && !gOnce) {
     17         return NULL;
     18     }
     19 
     20     if (!gOnce) {
     21         SkAutoMutexAcquire tmp(gMutex);
     22         if (!gOnce) {
     23             gTlsIndex = TlsAlloc();
     24             gOnce = true;
     25         }
     26     }
     27     return TlsGetValue(gTlsIndex);
     28 }
     29 
     30 void SkTLS::PlatformSetSpecific(void* ptr) {
     31     SkASSERT(gOnce);
     32     (void)TlsSetValue(gTlsIndex, ptr);
     33 }
     34 
     35 // Call TLS destructors on thread exit. Code based on Chromium's
     36 // base/threading/thread_local_storage_win.cc
     37 #ifdef _WIN64
     38 
     39 #pragma comment(linker, "/INCLUDE:_tls_used")
     40 #pragma comment(linker, "/INCLUDE:skia_tls_callback")
     41 
     42 #else
     43 
     44 #pragma comment(linker, "/INCLUDE:__tls_used")
     45 #pragma comment(linker, "/INCLUDE:_skia_tls_callback")
     46 
     47 #endif
     48 
     49 void NTAPI onTLSCallback(PVOID unused, DWORD reason, PVOID unused2) {
     50     if ((DLL_THREAD_DETACH == reason || DLL_PROCESS_DETACH == reason) && gOnce) {
     51         void* ptr = TlsGetValue(gTlsIndex);
     52         if (ptr != NULL) {
     53             SkTLS::Destructor(ptr);
     54             TlsSetValue(gTlsIndex, NULL);
     55         }
     56     }
     57 }
     58 
     59 extern "C" {
     60 
     61 #ifdef _WIN64
     62 
     63 #pragma const_seg(".CRT$XLB")
     64 extern const PIMAGE_TLS_CALLBACK skia_tls_callback;
     65 const PIMAGE_TLS_CALLBACK skia_tls_callback = onTLSCallback;
     66 #pragma const_seg()
     67 
     68 #else
     69 
     70 #pragma data_seg(".CRT$XLB")
     71 PIMAGE_TLS_CALLBACK skia_tls_callback = onTLSCallback;
     72 #pragma data_seg()
     73 
     74 #endif
     75 }
     76