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
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
/*
Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
This file is part of GlusterFS.
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
#include "circ-buff.h"
/* hold lock while calling this function */
int
__cb_add_entry_buffer (buffer_t *buffer, void *item)
{
circular_buffer_t *ptr = NULL;
int ret = -1;
//DO we really need the assert here?
GF_ASSERT (buffer->used_len <= buffer->size_buffer);
if (buffer->use_once == _gf_true &&
buffer->used_len == buffer->size_buffer) {
gf_log ("", GF_LOG_WARNING, "buffer %p is use once buffer",
buffer);
return -1;
} else {
if (buffer->used_len == buffer->size_buffer) {
if (buffer->cb[buffer->w_index]) {
ptr = buffer->cb[buffer->w_index];
if (ptr->data) {
GF_FREE (ptr->data);
ptr->data = NULL;
GF_FREE (ptr);
}
buffer->cb[buffer->w_index] = NULL;
ptr = NULL;
}
}
buffer->cb[buffer->w_index] =
GF_CALLOC (1, sizeof (circular_buffer_t),
gf_common_mt_circular_buffer_t);
if (!buffer->cb[buffer->w_index])
return -1;
buffer->cb[buffer->w_index]->data = item;
ret = gettimeofday (&buffer->cb[buffer->w_index]->tv, NULL);
if (ret == -1)
gf_log_callingfn ("", GF_LOG_WARNING, "getting time of"
"the day failed");
buffer->w_index++;
buffer->w_index %= buffer->size_buffer;
//used_buffer size cannot be greater than the total buffer size
if (buffer->used_len < buffer->size_buffer)
buffer->used_len++;
return buffer->w_index;
}
}
int
cb_add_entry_buffer (buffer_t *buffer, void *item)
{
int write_index = -1;
pthread_mutex_lock (&buffer->lock);
{
write_index = __cb_add_entry_buffer (buffer, item);
}
pthread_mutex_unlock (&buffer->lock);
return write_index;
}
void
cb_buffer_show (buffer_t *buffer)
{
pthread_mutex_lock (&buffer->lock);
{
gf_log ("", GF_LOG_DEBUG, "w_index: %d, size: %"GF_PRI_SIZET
" used_buffer: %d", buffer->w_index,
buffer->size_buffer,
buffer->used_len);
}
pthread_mutex_unlock (&buffer->lock);
}
void
cb_buffer_dump (buffer_t *buffer, void *data,
int (fn) (circular_buffer_t *buffer, void *data))
{
int index = 0;
circular_buffer_t *entry = NULL;
int entries = 0;
int ul = 0;
int w_ind = 0;
int size_buff = 0;
int i = 0;
ul = buffer->used_len;
w_ind = buffer->w_index;
size_buff = buffer->size_buffer;
pthread_mutex_lock (&buffer->lock);
{
if (buffer->use_once == _gf_false) {
index = (size_buff + (w_ind - ul))%size_buff;
for (entries = 0; entries < buffer->used_len;
entries++) {
entry = buffer->cb[index];
if (entry)
fn (entry, data);
else
gf_log_callingfn ("", GF_LOG_WARNING,
"Null entry in "
"circular buffer at "
"index %d.", index);
index++;
index %= buffer->size_buffer;
}
} else {
for (i = 0; i < buffer->used_len ; i++) {
entry = buffer->cb[i];
fn (entry, data);
}
}
}
pthread_mutex_unlock (&buffer->lock);
}
buffer_t *
cb_buffer_new (size_t buffer_size, gf_boolean_t use_once)
{
buffer_t *buffer = NULL;
buffer = GF_CALLOC (1, sizeof (*buffer), gf_common_mt_buffer_t);
if (!buffer) {
gf_log ("", GF_LOG_ERROR, "could not allocate the "
"buffer");
goto out;
}
buffer->cb = GF_CALLOC (buffer_size,
sizeof (circular_buffer_t *),
gf_common_mt_circular_buffer_t);
if (!buffer->cb) {
gf_log ("", GF_LOG_ERROR, "could not allocate the "
"memory for the circular buffer");
GF_FREE (buffer);
buffer = NULL;
goto out;
}
buffer->w_index = 0;
buffer->size_buffer = buffer_size;
buffer->use_once = use_once;
buffer->used_len = 0;
pthread_mutex_init (&buffer->lock, NULL);
out:
return buffer;
}
void
cb_buffer_destroy (buffer_t *buffer)
{
int i = 0;
if (buffer) {
if (buffer->cb) {
for (i = 0; i < buffer->used_len ; i++) {
GF_FREE (buffer->cb[i]);
}
GF_FREE (buffer->cb);
}
pthread_mutex_destroy (&buffer->lock);
GF_FREE (buffer);
}
}
|
