projects / lttng-tools.git / blame
| Commit | Line | Data |
|---|---|---|
| 331744e3 JD |
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 | /* | |
| 04ef1097 | 28 | * How many bytes from the cache are written contiguously. |
| 331744e3 | 29 | */ |
| 04ef1097 | 30 | uint64_t contiguous; |
| 331744e3 JD |
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). | |
| 73811ecc DG |
46 | * |
| 47 | * This is nested INSIDE the consumer_data lock. | |
| 331744e3 JD |
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, | |
| 5e41ebe1 | 57 | uint64_t offset, int timer); |
| 331744e3 JD |
58 | |
| 59 | #endif /* CONSUMER_METADATA_CACHE_H */ |