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
|
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2002 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* Routines for manipulating a FIFO queue
*/
#include <stdlib.h>
#include "fifo.h"
#include "memory.h"
typedef struct fifonode {
void *fn_data;
struct fifonode *fn_next;
} fifonode_t;
struct fifo {
fifonode_t *f_head;
fifonode_t *f_tail;
};
fifo_t *
fifo_new(void)
{
fifo_t *f;
f = xcalloc(sizeof (fifo_t));
return (f);
}
/* Add to the end of the fifo */
void
fifo_add(fifo_t *f, void *data)
{
fifonode_t *fn = xmalloc(sizeof (fifonode_t));
fn->fn_data = data;
fn->fn_next = NULL;
if (f->f_tail == NULL)
f->f_head = f->f_tail = fn;
else {
f->f_tail->fn_next = fn;
f->f_tail = fn;
}
}
/* Remove from the front of the fifo */
void *
fifo_remove(fifo_t *f)
{
fifonode_t *fn;
void *data;
if ((fn = f->f_head) == NULL)
return (NULL);
data = fn->fn_data;
if ((f->f_head = fn->fn_next) == NULL)
f->f_tail = NULL;
free(fn);
return (data);
}
/*ARGSUSED*/
static void
fifo_nullfree(void *arg)
{
/* this function intentionally left blank */
}
/* Free an entire fifo */
void
fifo_free(fifo_t *f, void (*freefn)(void *))
{
fifonode_t *fn = f->f_head;
fifonode_t *tmp;
if (freefn == NULL)
freefn = fifo_nullfree;
while (fn) {
(*freefn)(fn->fn_data);
tmp = fn;
fn = fn->fn_next;
free(tmp);
}
free(f);
}
int
fifo_len(fifo_t *f)
{
fifonode_t *fn;
int i;
for (i = 0, fn = f->f_head; fn; fn = fn->fn_next, i++);
return (i);
}
int
fifo_empty(fifo_t *f)
{
return (f->f_head == NULL);
}
int
fifo_iter(fifo_t *f, int (*iter)(void *data, void *arg), void *arg)
{
fifonode_t *fn;
int rc;
int ret = 0;
for (fn = f->f_head; fn; fn = fn->fn_next) {
if ((rc = iter(fn->fn_data, arg)) < 0)
return (-1);
ret += rc;
}
return (ret);
}
|
