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