michael@0: /*
michael@0:  * Copyright 2013 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: #include "SkTLS.h"
michael@0: #include "SkThread.h"
michael@0: 
michael@0: static bool gOnce = false;
michael@0: static DWORD gTlsIndex;
michael@0: SK_DECLARE_STATIC_MUTEX(gMutex);
michael@0: 
michael@0: void* SkTLS::PlatformGetSpecific(bool forceCreateTheSlot) {
michael@0:     if (!forceCreateTheSlot && !gOnce) {
michael@0:         return NULL;
michael@0:     }
michael@0: 
michael@0:     if (!gOnce) {
michael@0:         SkAutoMutexAcquire tmp(gMutex);
michael@0:         if (!gOnce) {
michael@0:             gTlsIndex = TlsAlloc();
michael@0:             gOnce = true;
michael@0:         }
michael@0:     }
michael@0:     return TlsGetValue(gTlsIndex);
michael@0: }
michael@0: 
michael@0: void SkTLS::PlatformSetSpecific(void* ptr) {
michael@0:     SkASSERT(gOnce);
michael@0:     (void)TlsSetValue(gTlsIndex, ptr);
michael@0: }
michael@0: 
michael@0: // Call TLS destructors on thread exit. Code based on Chromium's
michael@0: // base/threading/thread_local_storage_win.cc
michael@0: #ifdef _WIN64
michael@0: 
michael@0: #pragma comment(linker, "/INCLUDE:_tls_used")
michael@0: #pragma comment(linker, "/INCLUDE:skia_tls_callback")
michael@0: 
michael@0: #else
michael@0: 
michael@0: #pragma comment(linker, "/INCLUDE:__tls_used")
michael@0: #pragma comment(linker, "/INCLUDE:_skia_tls_callback")
michael@0: 
michael@0: #endif
michael@0: 
michael@0: void NTAPI onTLSCallback(PVOID unused, DWORD reason, PVOID unused2) {
michael@0:     if ((DLL_THREAD_DETACH == reason || DLL_PROCESS_DETACH == reason) && gOnce) {
michael@0:         void* ptr = TlsGetValue(gTlsIndex);
michael@0:         if (ptr != NULL) {
michael@0:             SkTLS::Destructor(ptr);
michael@0:             TlsSetValue(gTlsIndex, NULL);
michael@0:         }
michael@0:     }
michael@0: }
michael@0: 
michael@0: extern "C" {
michael@0: 
michael@0: #ifdef _WIN64
michael@0: 
michael@0: #pragma const_seg(".CRT$XLB")
michael@0: extern const PIMAGE_TLS_CALLBACK skia_tls_callback;
michael@0: const PIMAGE_TLS_CALLBACK skia_tls_callback = onTLSCallback;
michael@0: #pragma const_seg()
michael@0: 
michael@0: #else
michael@0: 
michael@0: #pragma data_seg(".CRT$XLB")
michael@0: PIMAGE_TLS_CALLBACK skia_tls_callback = onTLSCallback;
michael@0: #pragma data_seg()
michael@0: 
michael@0: #endif
michael@0: }