Create userspace buffers using ua_sess effective credentials
[lttng-tools.git] / src / common / consumer / 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/consumer.h>
23
24 struct consumer_metadata_cache {
25 char *data;
26 uint64_t cache_alloc_size;
27 /*
28 * Current version of the metadata cache.
29 */
30 uint64_t version;
31 /*
32 * The upper-limit of data written inside the buffer.
33 *
34 * With the total_bytes_written it allows us to keep track of when the
35 * cache contains contiguous metadata ready to be sent to the RB.
36 * All cached data is contiguous.
37 */
38 uint64_t max_offset;
39 /*
40 * Lock to update the metadata cache and push into the ring_buffer
41 * (ustctl_write_metadata_to_channel).
42 *
43 * This is nested INSIDE the consumer_data lock.
44 */
45 pthread_mutex_t lock;
46 };
47
48 int consumer_metadata_cache_write(struct lttng_consumer_channel *channel,
49 unsigned int offset, unsigned int len, uint64_t version,
50 char *data);
51 int consumer_metadata_cache_allocate(struct lttng_consumer_channel *channel);
52 void consumer_metadata_cache_destroy(struct lttng_consumer_channel *channel);
53 int consumer_metadata_cache_flushed(struct lttng_consumer_channel *channel,
54 uint64_t offset, int timer);
55 int consumer_metadata_wakeup_pipe(const struct lttng_consumer_channel *channel);
56
57 #endif /* CONSUMER_METADATA_CACHE_H */
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