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
PlatformGetSpecific(bool forceCreateTheSlot)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
PlatformSetSpecific(void * ptr)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
onTLSCallback(PVOID unused,DWORD reason,PVOID unused2)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