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[strongswan.git] / src / charon / queues / send_queue.c
1 /**
2 * @file send_queue.c
3 *
4 * @brief Implementation of send_queue_t.
5 *
6 */
7
8 /*
9 * Copyright (C) 2005 Jan Hutter, Martin Willi
10 * Hochschule fuer Technik Rapperswil
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the
14 * Free Software Foundation; either version 2 of the License, or (at your
15 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
19 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
20 * for more details.
21 */
22
23 #include <pthread.h>
24
25 #include "send_queue.h"
26
27 #include <utils/linked_list.h>
28
29
30 typedef struct private_send_queue_t private_send_queue_t;
31
32 /**
33 * @brief Private Variables and Functions of send_queue class
34 *
35 */
36 struct private_send_queue_t {
37 /**
38 * Public part of the send_queue_t object
39 */
40 send_queue_t public;
41
42 /**
43 * The packets are stored in a linked list
44 */
45 linked_list_t *list;
46
47 /**
48 * access to linked_list is locked through this mutex
49 */
50 pthread_mutex_t mutex;
51
52 /**
53 * If the queue is empty a thread has to wait
54 * This condvar is used to wake up such a thread
55 */
56 pthread_cond_t condvar;
57 };
58
59
60 /**
61 * implements send_queue_t.get_count
62 */
63 static int get_count(private_send_queue_t *this)
64 {
65 int count;
66 pthread_mutex_lock(&(this->mutex));
67 count = this->list->get_count(this->list);
68 pthread_mutex_unlock(&(this->mutex));
69 return count;
70 }
71
72 /**
73 * implements send_queue_t.get
74 */
75 static packet_t *get(private_send_queue_t *this)
76 {
77 int oldstate;
78 packet_t *packet;
79 pthread_mutex_lock(&(this->mutex));
80 /* go to wait while no packets available */
81
82 while(this->list->get_count(this->list) == 0)
83 {
84 /* add mutex unlock handler for cancellation, enable cancellation */
85 pthread_cleanup_push((void(*)(void*))pthread_mutex_unlock, (void*)&(this->mutex));
86 pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &oldstate);
87 pthread_cond_wait( &(this->condvar), &(this->mutex));
88
89 /* reset cancellation, remove mutex-unlock handler (without executing) */
90 pthread_setcancelstate(oldstate, NULL);
91 pthread_cleanup_pop(0);
92 }
93 this->list->remove_first(this->list,(void **)&packet);
94 pthread_mutex_unlock(&(this->mutex));
95 return packet;
96 }
97
98 /**
99 * implements send_queue_t.add
100 */
101 static void add(private_send_queue_t *this, packet_t *packet)
102 {
103 pthread_mutex_lock(&(this->mutex));
104 this->list->insert_last(this->list,packet);
105 pthread_cond_signal( &(this->condvar));
106 pthread_mutex_unlock(&(this->mutex));
107 }
108
109 /**
110 * implements send_queue_t.destroy
111 */
112 static void destroy (private_send_queue_t *this)
113 {
114
115 /* destroy all packets in list before destroying list */
116 while (this->list->get_count(this->list) > 0)
117 {
118 packet_t *packet;
119 if (this->list->remove_first(this->list,(void *) &packet) != SUCCESS)
120 {
121 this->list->destroy(this->list);
122 break;
123 }
124 packet->destroy(packet);
125 }
126 this->list->destroy(this->list);
127
128 pthread_mutex_destroy(&(this->mutex));
129
130 pthread_cond_destroy(&(this->condvar));
131
132 free(this);
133 }
134
135 /*
136 *
137 * Documented in header
138 */
139 send_queue_t *send_queue_create(void)
140 {
141 private_send_queue_t *this = malloc_thing(private_send_queue_t);
142
143 this->public.get_count = (int(*)(send_queue_t*)) get_count;
144 this->public.get = (packet_t*(*)(send_queue_t*)) get;
145 this->public.add = (void(*)(send_queue_t*, packet_t*)) add;
146 this->public.destroy = (void(*)(send_queue_t*)) destroy;
147
148 this->list = linked_list_create();
149 pthread_mutex_init(&(this->mutex), NULL);
150 pthread_cond_init(&(this->condvar), NULL);
151
152 return (&this->public);
153 }