blob: e3f6f3bcf9001f4b5ec7d905dcaa0c24ded45518 (
plain)
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
|
/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Laxmikant Rashinkar 2004-2014
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* FIFO implementation to store pointer to data struct
*/
#include "fifo.h"
#include "os_calls.h"
/**
* Create new fifo data struct
*
* @return pointer to new FIFO or NULL if system out of memory
*****************************************************************************/
FIFO * APP_CC
fifo_create(void)
{
return (FIFO *) g_malloc(sizeof(FIFO), 1);
}
/**
* Delete specified FIFO
*****************************************************************************/
void APP_CC
fifo_delete(FIFO *self)
{
USER_DATA *udp;
if (!self)
return;
if (!self->head)
{
/* FIFO is empty */
g_free(self);
return;
}
if (self->head == self->tail)
{
/* only one item in FIFO */
if (self->auto_free)
g_free(self->head->item);
g_free(self->head);
g_free(self);
return;
}
/* more then one item in FIFO */
while (self->head)
{
udp = self->head;
if (self->auto_free)
g_free(udp->item);
self->head = udp->next;
g_free(udp);
}
g_free(self);
}
/**
* Add an item to the specified FIFO
*
* @param self FIFO to operate on
* @param item item to add to specified FIFO
*
* @return 0 on success, -1 on error
*****************************************************************************/
int APP_CC
fifo_add_item(FIFO *self, void *item)
{
USER_DATA *udp;
if (!self || !item)
return -1;
if ((udp = (USER_DATA *) g_malloc(sizeof(USER_DATA), 0)) == 0)
return -1;
udp->item = item;
udp->next = 0;
/* if fifo is empty, add to head */
if (!self->head)
{
self->head = udp;
self->tail = udp;
return 0;
}
/* add to tail */
self->tail->next = udp;
self->tail = udp;
return 0;
}
/**
* Return an item from top of FIFO
*
* @param self FIFO to operate on
*
* @return top item from FIFO or NULL if FIFO is empty
*****************************************************************************/
void * APP_CC
fifo_remove_item(FIFO *self)
{
void *item;
USER_DATA *udp;
if (!self || !self->head)
return 0;
if (self->head == self->tail)
{
/* only one item in FIFO */
item = self->head->item;
g_free(self->head);
self->head = 0;
self->tail = 0;
return item;
}
/* more then one item in FIFO */
udp = self->head;
item = self->head->item;
self->head = self->head->next;
g_free(udp);
return item;
}
/**
* Return FIFO status
*
* @param self FIFO to operate on
*
* @return true if FIFO is empty, false otherwise
*****************************************************************************/
int APP_CC
fifo_is_empty(FIFO *self)
{
if (!self)
return 1;
return (self->head == 0);
}
|
