1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
/**
* @file llrefcount.h
* @brief Base class for reference counted objects for use with LLPointer
*
* $LicenseInfo:firstyear=2002&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#ifndef LLREFCOUNT_H
#define LLREFCOUNT_H
#include <boost/noncopyable.hpp>
#define LL_REF_COUNT_DEBUG 0
#if LL_REF_COUNT_DEBUG
class LLMutex ;
#endif
//----------------------------------------------------------------------------
// RefCount objects should generally only be accessed by way of LLPointer<>'s
// see llthread.h for LLThreadSafeRefCount
//----------------------------------------------------------------------------
class LL_COMMON_API LLRefCount
{
protected:
LLRefCount(const LLRefCount& other);
LLRefCount& operator=(const LLRefCount&);
virtual ~LLRefCount(); // use unref()
public:
LLRefCount();
#if LL_REF_COUNT_DEBUG
void ref() const ;
S32 unref() const ;
#else
void LLRefCount::ref() const
{
mRef++;
}
S32 LLRefCount::unref() const
{
llassert(mRef >= 1);
if (0 == --mRef)
{
delete this;
return 0;
}
return mRef;
}
#endif
//NOTE: when passing around a const LLRefCount object, this can return different results
// at different types, since mRef is mutable
S32 getNumRefs() const
{
return mRef;
}
private:
mutable S32 mRef;
#if LL_REF_COUNT_DEBUG
LLMutex* mMutexp ;
mutable U32 mLockedThreadID ;
mutable BOOL mCrashAtUnlock ;
#endif
};
#endif
|
