Lock.h
Go to the documentation of this file.
1 /*
2  * Copyright (C) 1996-2017 The Squid Software Foundation and contributors
3  *
4  * Squid software is distributed under GPLv2+ license and includes
5  * contributions from numerous individuals and organizations.
6  * Please see the COPYING and CONTRIBUTORS files for details.
7  */
8 
9 #ifndef SQUID_SRC_BASE_LOCK_H
10 #define SQUID_SRC_BASE_LOCK_H
11 
25 class Lock
26 {
27 public:
28  Lock():count_(0) {}
29 
30  virtual ~Lock() { assert(count_ == 0); }
31 
34  void lock() const {
35 #if defined(LOCKCOUNT_DEBUG)
36  debugs(0,1, "Incrementing this " << static_cast<void*>(this) << " from count " << count_);
37 #endif
39  ++count_;
40  }
41 
44  uint32_t unlock() const {
45 #if defined(LOCKCOUNT_DEBUG)
46  debugs(0,1, "Decrementing this " << static_cast<void*>(this) << " from count " << count_);
47 #endif
48  assert(count_ > 0);
49  return --count_;
50  }
51 
53  uint32_t LockCount() const { return count_; }
54 
55 private:
56  mutable uint32_t count_;
57 };
58 
59 // For clarity we provide some aliases for the tracking mechanisms
60 // using Lock so that we can easily see what type of smart pointers
61 // are to be used for the child object.
62 // NP: CbcPointer<> and RefCount<> pointers should be used consistently
63 // for any given child class type
64 
66 #define RefCountable virtual Lock
67 
68 #endif /* SQUID_SRC_BASE_LOCK_H */
69 
virtual ~Lock()
Definition: Lock.h:30
#define assert(EX)
Definition: assert.h:17
#define debugs(SECTION, LEVEL, CONTENT)
Definition: Debug.h:123
uint32_t count_
number of references currently being tracked
Definition: Lock.h:56
void lock() const
Definition: Lock.h:34
uint32_t unlock() const
Definition: Lock.h:44
uint32_t LockCount() const
Inspect the current count of references.
Definition: Lock.h:53
Lock()
Definition: Lock.h:28
Definition: Lock.h:25
#define UINT32_MAX
Definition: types.h:72

 

Introduction

Documentation

Support

Miscellaneous

Web Site Translations

Mirrors