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 #ifndef SkMutex_win_DEFINED 9 #define SkMutex_win_DEFINED 10 11 /** Windows CriticalSection based mutex. */ 12 13 #ifndef WIN32_LEAN_AND_MEAN 14 # define WIN32_LEAN_AND_MEAN 15 # define WIN32_IS_MEAN_WAS_LOCALLY_DEFINED 16 #endif 17 #ifndef NOMINMAX 18 # define NOMINMAX 19 # define NOMINMAX_WAS_LOCALLY_DEFINED 20 #endif 21 # 22 #include <windows.h> 23 # 24 #ifdef WIN32_IS_MEAN_WAS_LOCALLY_DEFINED 25 # undef WIN32_IS_MEAN_WAS_LOCALLY_DEFINED 26 # undef WIN32_LEAN_AND_MEAN 27 #endif 28 #ifdef NOMINMAX_WAS_LOCALLY_DEFINED 29 # undef NOMINMAX_WAS_LOCALLY_DEFINED 30 # undef NOMINMAX 31 #endif 32 33 // On Windows, SkBaseMutex and SkMutex are the same thing, 34 // we can't easily get rid of static initializers. 35 class SkMutex { 36 public: SkMutex()37 SkMutex() { 38 InitializeCriticalSection(&fStorage); 39 SkDEBUGCODE(fOwner = 0;) 40 } 41 ~SkMutex()42 ~SkMutex() { 43 SkASSERT(0 == fOwner); 44 DeleteCriticalSection(&fStorage); 45 } 46 acquire()47 void acquire() { 48 EnterCriticalSection(&fStorage); 49 SkDEBUGCODE(fOwner = GetCurrentThreadId();) 50 } 51 release()52 void release() { 53 this->assertHeld(); 54 SkDEBUGCODE(fOwner = 0;) 55 LeaveCriticalSection(&fStorage); 56 } 57 assertHeld()58 void assertHeld() { 59 SkASSERT(GetCurrentThreadId() == fOwner); 60 } 61 62 private: 63 SkMutex(const SkMutex&); 64 SkMutex& operator=(const SkMutex&); 65 66 CRITICAL_SECTION fStorage; 67 SkDEBUGCODE(DWORD fOwner;) 68 }; 69 70 typedef SkMutex SkBaseMutex; 71 72 // Windows currently provides no documented means of POD initializing a CRITICAL_SECTION. 73 #define SK_DECLARE_STATIC_MUTEX(name) static SkBaseMutex name 74 #define SK_DECLARE_GLOBAL_MUTEX(name) SkBaseMutex name 75 76 #endif 77