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
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
/* -*- C++ -*- */
// ============================================================================
//
// = LIBRARY
// ace
//
// = FILENAME
// Free_List.h
//
// = AUTHOR
// Darrell Brunsch (brunsch@cs.wustl.edu)
//
// ============================================================================
#if !defined (ACE_FREE_LIST_H)
#define ACE_FREE_LIST_H
#include "ace/OS.h"
#include "ace/Synch_T.h"
template <class T>
class ACE_Free_List
{
// = TITLE
// Implements a free list.
//
// = DESCRIPTION
// This class maintains a free list of nodes of type T.
public:
virtual ~ACE_Free_List (void);
// Destructor - removes all the elements from the free_list.
virtual void add (T *element) = 0;
// Inserts an element onto the free list (if it isn't past the high
// water mark).
virtual T *remove (void) = 0;
// Takes a element off the freelist and returns it. It creates
// <inc> new elements if the size is at or below the low water mark.
virtual size_t size (void) = 0;
// Returns the current size of the free list.
virtual void resize (size_t newsize) = 0;
// Resizes the free list to <newsize>.
};
template <class T, class ACE_LOCK>
class ACE_Locked_Free_List : public ACE_Free_List<T>
{
// = TITLE
// Implements a free list.
//
// = DESCRIPTION
// This class maintains a free list of nodes of type T. It depends on
// the type T having a get_next () and set_next () method. It maintains
// a mutex so the freelist can be used in a multithreaded program .
public:
// = Initialization and termination.
ACE_Locked_Free_List (int mode = ACE_FREE_LIST_WITH_POOL,
size_t prealloc = ACE_DEFAULT_FREE_LIST_PREALLOC,
size_t lwm = ACE_DEFAULT_FREE_LIST_LWM,
size_t hwm = ACE_DEFAULT_FREE_LIST_HWM,
size_t inc = ACE_DEFAULT_FREE_LIST_INC);
// Constructor takes a <mode> (i.e., ACE_FREE_LIST_WITH_POOL or
// ACE_PURE_FREE_LIST), a count of the number of nodes to
// <prealloc>, a low and high water mark (<lwm> and <hwm>) that
// indicate when to allocate more nodes, an increment value (<inc>)
// that indicates how many nodes to allocate when the list must
// grow.
virtual ~ACE_Locked_Free_List (void);
// Destructor - removes all the elements from the free_list.
virtual void add (T *element);
// Inserts an element onto the free list (if it isn't past the high
// water mark).
virtual T *remove (void);
// Takes a element off the freelist and returns it. It creates
// <inc> new elements if the size is at or below the low water mark.
virtual size_t size (void);
// Returns the current size of the free list.
virtual void resize (size_t newsize);
// Resizes the free list to <newsize>.
protected:
virtual void alloc (size_t n);
// Allocates <n> extra nodes for the freelist.
virtual void dealloc (size_t n);
// Removes and frees <n> nodes from the freelist.
int mode_;
// Free list operation mode, either ACE_FREE_LIST_WITH_POOL or
// ACE_PURE_FREE_LIST.
T *free_list_;
// Pointer to the first node in the freelist.
size_t lwm_;
// Low water mark.
size_t hwm_;
// High water mark.
size_t inc_;
// Increment value.
size_t size_;
// Keeps track of the size of the list.
ACE_LOCK mutex_;
// Synchronization variable for <ACE_Timer_Queue>.
private:
// = Don't allow these operations for now.
ACE_UNIMPLEMENTED_FUNC (ACE_Locked_Free_List (const ACE_Locked_Free_List<T, ACE_LOCK> &))
ACE_UNIMPLEMENTED_FUNC (void operator= (const ACE_Locked_Free_List<T, ACE_LOCK> &))
};
#if defined (__ACE_INLINE__)
#include "ace/Free_List.i"
#endif /* __ACE_INLINE__ */
#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
#include "ace/Free_List.cpp"
#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
#pragma implementation ("Free_List.cpp")
#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
#endif /* ACE_FREE_LIST_H */
|
