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- /*
- * Copyright 2016 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #ifndef GrSingleOwner_DEFINED
- #define GrSingleOwner_DEFINED
- #include "include/core/SkTypes.h"
- #ifdef SK_DEBUG
- #include "include/private/SkMutex.h"
- #include "include/private/SkThreadID.h"
- // This is a debug tool to verify an object is only being used from one thread at a time.
- class GrSingleOwner {
- public:
- GrSingleOwner() : fOwner(kIllegalThreadID), fReentranceCount(0) {}
- struct AutoEnforce {
- AutoEnforce(GrSingleOwner* so) : fSO(so) { fSO->enter(); }
- ~AutoEnforce() { fSO->exit(); }
- GrSingleOwner* fSO;
- };
- private:
- void enter() {
- SkAutoMutexExclusive lock(fMutex);
- SkThreadID self = SkGetThreadID();
- SkASSERT(fOwner == self || fOwner == kIllegalThreadID);
- fReentranceCount++;
- fOwner = self;
- }
- void exit() {
- SkAutoMutexExclusive lock(fMutex);
- SkASSERT(fOwner == SkGetThreadID());
- fReentranceCount--;
- if (fReentranceCount == 0) {
- fOwner = kIllegalThreadID;
- }
- }
- SkMutex fMutex;
- SkThreadID fOwner SK_GUARDED_BY(fMutex);
- int fReentranceCount SK_GUARDED_BY(fMutex);
- };
- #else
- class GrSingleOwner {}; // Provide a dummy implementation so we can pass pointers to constructors
- #endif
- #endif
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