2 * This file is part of DisOrder.
3 * Copyright (C) 2007 Richard Kettlewell
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 /** @file clients/playrtp-mem.c
19 * @brief RTP player memory management
31 /** @brief Linked list of free packets
33 * This is a linked list of formerly used packets. For preference we re-use
34 * packets that have already been used rather than unused ones, to limit the
35 * size of the program's working set. If there are no free packets in the list
36 * we try @ref next_free_packet instead.
38 * Must hold @ref lock when accessing this.
40 static union free_packet
*free_packets
;
42 /** @brief Array of new free packets
44 * There are @ref count_free_packets ready to use at this address. If there
45 * are none left we allocate more memory.
47 * Must hold @ref lock when accessing this.
49 static union free_packet
*next_free_packet
;
51 /** @brief Count of new free packets at @ref next_free_packet
53 * Must hold @ref lock when accessing this.
55 static size_t count_free_packets
;
57 /** @brief Lock protecting packet allocator */
58 static pthread_mutex_t mem_lock
= PTHREAD_MUTEX_INITIALIZER
;
60 /** @brief Return a new packet */
61 struct packet
*playrtp_new_packet(void) {
64 pthread_mutex_lock(&mem_lock
);
67 free_packets
= free_packets
->next
;
69 if(!count_free_packets
) {
70 next_free_packet
= xcalloc(1024, sizeof (union free_packet
));
71 count_free_packets
= 1024;
73 p
= &(next_free_packet
++)->p
;
76 pthread_mutex_unlock(&mem_lock
);
80 /** @brief Free a packet */
81 void playrtp_free_packet(struct packet
*p
) {
82 union free_packet
*u
= (union free_packet
*)p
;
83 pthread_mutex_lock(&mem_lock
);
84 u
->next
= free_packets
;
86 pthread_mutex_unlock(&mem_lock
);