WAND Trace processing  4.0.5
message_queue.h
1 /*
2  *
3  * Copyright (c) 2007-2016 The University of Waikato, Hamilton, New Zealand.
4  * All rights reserved.
5  *
6  * This file is part of libtrace.
7  *
8  * This code has been developed by the University of Waikato WAND
9  * research group. For further information please see http://www.wand.net.nz/
10  *
11  * libtrace is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU Lesser General Public License as published by
13  * the Free Software Foundation; either version 3 of the License, or
14  * (at your option) any later version.
15  *
16  * libtrace is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19  * GNU Lesser General Public License for more details.
20  *
21  * You should have received a copy of the GNU Lesser General Public License
22  * along with this program. If not, see <http://www.gnu.org/licenses/>.
23  *
24  *
25  */
26 #include <pthread.h>
27 #include <limits.h>
28 #include "libtrace.h"
29 #include "pthread_spinlock.h"
30 
31 #ifndef LIBTRACE_MESSAGE_QUEUE
32 #define LIBTRACE_MESSAGE_QUEUE
33 
34 #define LIBTRACE_MQ_FAILED INT_MIN
35 typedef struct libtrace_message_queue_t {
36  int pipefd[2];
37  volatile int message_count;
38  size_t message_len;
39  pthread_spinlock_t spin;
41 
42 DLLEXPORT void libtrace_message_queue_init(libtrace_message_queue_t *mq,
43  size_t message_len);
44 DLLEXPORT int libtrace_message_queue_put(libtrace_message_queue_t *mq,
45  const void *message);
46 DLLEXPORT int libtrace_message_queue_count(const libtrace_message_queue_t *mq);
47 DLLEXPORT int libtrace_message_queue_get(libtrace_message_queue_t *mq,
48  void *message);
49 DLLEXPORT int libtrace_message_queue_try_get(libtrace_message_queue_t *mq,
50  void *message);
51 DLLEXPORT void libtrace_message_queue_destroy(libtrace_message_queue_t *mq);
52 DLLEXPORT int libtrace_message_queue_get_fd(libtrace_message_queue_t *mq);
53 
54 #endif
Trace file processing library header.
Definition: message_queue.h:35