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joshualitt2419b362015-07-13 09:29:42 -07001/*
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 */
cdalton4833f392016-02-02 22:46:16 -080018template<typename TSubclass> class GrNonAtomicRef : public SkNoncopyable {
joshualitt2419b362015-07-13 09:29:42 -070019public:
20 GrNonAtomicRef() : fRefCnt(1) {}
cdalton4833f392016-02-02 22:46:16 -080021
22#ifdef SK_DEBUG
23 ~GrNonAtomicRef() {
joshualitt2419b362015-07-13 09:29:42 -070024 // fRefCnt can be one when a subclass is created statically
25 SkASSERT((0 == fRefCnt || 1 == fRefCnt));
26 // Set to invalid values.
cdalton4833f392016-02-02 22:46:16 -080027 fRefCnt = -10;
joshualitt2419b362015-07-13 09:29:42 -070028 }
cdalton4833f392016-02-02 22:46:16 -080029#endif
joshualitt2419b362015-07-13 09:29:42 -070030
csmartdalton28341fa2016-08-17 10:00:21 -070031 bool unique() const { return 1 == fRefCnt; }
32
joshualitt2419b362015-07-13 09:29:42 -070033 void ref() const {
34 // Once the ref cnt reaches zero it should never be ref'ed again.
35 SkASSERT(fRefCnt > 0);
36 ++fRefCnt;
37 }
38
39 void unref() const {
40 SkASSERT(fRefCnt > 0);
41 --fRefCnt;
42 if (0 == fRefCnt) {
cdalton4833f392016-02-02 22:46:16 -080043 GrTDeleteNonAtomicRef(static_cast<const TSubclass*>(this));
joshualitt2419b362015-07-13 09:29:42 -070044 return;
45 }
46 }
47
48private:
49 mutable int32_t fRefCnt;
50
51 typedef SkNoncopyable INHERITED;
52};
53
cdalton4833f392016-02-02 22:46:16 -080054template<typename T> inline void GrTDeleteNonAtomicRef(const T* ref) {
55 delete ref;
56}
57
joshualitt2419b362015-07-13 09:29:42 -070058#endif