/*
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* Copyright 2015 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef GrNonAtomicRef_DEFINED
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#define GrNonAtomicRef_DEFINED
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#include "SkNoncopyable.h"
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#include "SkRefCnt.h"
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#include "SkTArray.h"
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/**
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* A simple non-atomic ref used in the GrBackendApi when we don't want to pay for the overhead of a
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* threadsafe ref counted object
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*/
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template<typename TSubclass> class GrNonAtomicRef : public SkNoncopyable {
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public:
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GrNonAtomicRef() : fRefCnt(1) {}
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#ifdef SK_DEBUG
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~GrNonAtomicRef() {
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// fRefCnt can be one when a subclass is created statically
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SkASSERT((0 == fRefCnt || 1 == fRefCnt));
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// Set to invalid values.
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fRefCnt = -10;
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}
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#endif
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bool unique() const { return 1 == fRefCnt; }
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void ref() const {
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// Once the ref cnt reaches zero it should never be ref'ed again.
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SkASSERT(fRefCnt > 0);
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++fRefCnt;
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}
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void unref() const {
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SkASSERT(fRefCnt > 0);
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--fRefCnt;
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if (0 == fRefCnt) {
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GrTDeleteNonAtomicRef(static_cast<const TSubclass*>(this));
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return;
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}
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}
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private:
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mutable int32_t fRefCnt;
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typedef SkNoncopyable INHERITED;
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};
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template<typename T> inline void GrTDeleteNonAtomicRef(const T* ref) {
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delete ref;
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}
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#endif
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