2 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
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.
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
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.
19 #ifndef CONSUMER_METADATA_CACHE_H
20 #define CONSUMER_METADATA_CACHE_H
22 #include <common/consumer/consumer.h>
24 struct consumer_metadata_cache
{
26 uint64_t cache_alloc_size
;
28 * Current version of the metadata cache.
32 * The upper-limit of data written inside the buffer.
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.
40 * Lock to update the metadata cache and push into the ring_buffer
41 * (ustctl_write_metadata_to_channel).
43 * This is nested INSIDE the consumer_data lock.
48 int consumer_metadata_cache_write(struct lttng_consumer_channel
*channel
,
49 unsigned int offset
, unsigned int len
, uint64_t version
,
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
);
57 #endif /* CONSUMER_METADATA_CACHE_H */
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