Fix: don't send error to sessiond on orderly shutdown
[lttng-tools.git] / src / common / consumer-metadata-cache.h
1 /*
2 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
17 */
18
19 #ifndef CONSUMER_METADATA_CACHE_H
20 #define CONSUMER_METADATA_CACHE_H
21
22 #include <common/consumer.h>
23
24 struct consumer_metadata_cache {
25 char *data;
26 uint64_t cache_alloc_size;
27 /*
28 * How many bytes from the cache were already sent to the ring buffer.
29 */
30 uint64_t rb_pushed;
31 /*
32 * How many bytes are written in the buffer (excluding the wholes).
33 */
34 uint64_t total_bytes_written;
35 /*
36 * The upper-limit of data written inside the buffer.
37 *
38 * With the total_bytes_written it allows us to keep track of when the
39 * cache contains contiguous metadata ready to be sent to the RB.
40 * The metadata cache updates must not overlap.
41 */
42 uint64_t max_offset;
43 /*
44 * Lock to update the metadata cache and push into the ring_buffer
45 * (ustctl_write_metadata_to_channel).
46 *
47 * This is nested INSIDE the consumer_data lock.
48 */
49 pthread_mutex_t lock;
50 };
51
52 int consumer_metadata_cache_write(struct lttng_consumer_channel *channel,
53 unsigned int offset, unsigned int len, char *data);
54 int consumer_metadata_cache_allocate(struct lttng_consumer_channel *channel);
55 void consumer_metadata_cache_destroy(struct lttng_consumer_channel *channel);
56 int consumer_metadata_cache_flushed(struct lttng_consumer_channel *channel,
57 uint64_t offset);
58
59 #endif /* CONSUMER_METADATA_CACHE_H */
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