1 /* 2 * Copyright 2015 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 GrNonAtomicRef_DEFINED 9 #define GrNonAtomicRef_DEFINED 10 11 #include "SkRefCnt.h" 12 #include "SkTArray.h" 13 14 /** 15 * A simple non-atomic ref used in the GrBackend when we don't want to pay for the overhead of a 16 * threadsafe ref counted object 17 */ 18 template<typename TSubclass> class GrNonAtomicRef : public SkNoncopyable { 19 public: GrNonAtomicRef()20 GrNonAtomicRef() : fRefCnt(1) {} 21 22 #ifdef SK_DEBUG ~GrNonAtomicRef()23 ~GrNonAtomicRef() { 24 // fRefCnt can be one when a subclass is created statically 25 SkASSERT((0 == fRefCnt || 1 == fRefCnt)); 26 // Set to invalid values. 27 fRefCnt = -10; 28 } 29 #endif 30 ref()31 void ref() const { 32 // Once the ref cnt reaches zero it should never be ref'ed again. 33 SkASSERT(fRefCnt > 0); 34 ++fRefCnt; 35 } 36 unref()37 void unref() const { 38 SkASSERT(fRefCnt > 0); 39 --fRefCnt; 40 if (0 == fRefCnt) { 41 GrTDeleteNonAtomicRef(static_cast<const TSubclass*>(this)); 42 return; 43 } 44 } 45 46 private: 47 mutable int32_t fRefCnt; 48 49 typedef SkNoncopyable INHERITED; 50 }; 51 GrTDeleteNonAtomicRef(const T * ref)52template<typename T> inline void GrTDeleteNonAtomicRef(const T* ref) { 53 delete ref; 54 } 55 56 #endif 57