projects / lttng-tools.git / blame
| Commit | Line | Data |
|---|---|---|
| 331744e3 | 1 | /* |
| ab5be9fa MJ |
2 | * Copyright (C) 2013 Julien Desfossez <jdesfossez@efficios.com> |
| 3 | * Copyright (C) 2013 David Goulet <dgoulet@efficios.com> | |
| 331744e3 | 4 | * |
| ab5be9fa | 5 | * SPDX-License-Identifier: GPL-2.0-only |
| 331744e3 | 6 | * |
| 331744e3 JD |
7 | */ |
| 8 | ||
| 9 | #ifndef CONSUMER_METADATA_CACHE_H | |
| 10 | #define CONSUMER_METADATA_CACHE_H | |
| 11 | ||
| c8fea79c | 12 | #include <common/consumer/consumer.h> |
| 9eac9828 | 13 | #include <common/dynamic-buffer.h> |
| 331744e3 | 14 | |
| b1316da1 JG |
15 | enum consumer_metadata_cache_write_status { |
| 16 | CONSUMER_METADATA_CACHE_WRITE_STATUS_ERROR = -1, | |
| 17 | /* | |
| 18 | * New metadata content was appended to the cache successfully. | |
| 19 | * Previously available content remains valid. | |
| 20 | */ | |
| 21 | CONSUMER_METADATA_CACHE_WRITE_STATUS_APPENDED_CONTENT = 0, | |
| 22 | /* | |
| 23 | * The new content pushed to the cache invalidated the content that | |
| 24 | * was already present. The contents of the cache should be re-read. | |
| 25 | */ | |
| 26 | CONSUMER_METADATA_CACHE_WRITE_STATUS_INVALIDATED, | |
| 27 | /* | |
| 28 | * A metadata cache write can simply overwrite an already existing | |
| 29 | * section of the cache (and it should be a write-through with identical | |
| 30 | * data). From the caller's standpoint, there is no change to the state | |
| 31 | * of the cache. | |
| 32 | */ | |
| 33 | CONSUMER_METADATA_CACHE_WRITE_STATUS_NO_CHANGE, | |
| 34 | }; | |
| 35 | ||
| 331744e3 | 36 | struct consumer_metadata_cache { |
| 9eac9828 | 37 | /* Current version of the metadata cache. */ |
| 93ec662e | 38 | uint64_t version; |
| 331744e3 | 39 | /* |
| 9eac9828 | 40 | * Size is the upper-limit of data written inside the buffer. |
| c585821b | 41 | * All cached data is contiguous. |
| 331744e3 | 42 | */ |
| 9eac9828 | 43 | struct lttng_dynamic_buffer contents; |
| 331744e3 JD |
44 | /* |
| 45 | * Lock to update the metadata cache and push into the ring_buffer | |
| b623cb6a | 46 | * (lttng_ust_ctl_write_metadata_to_channel). |
| 73811ecc DG |
47 | * |
| 48 | * This is nested INSIDE the consumer_data lock. | |
| 331744e3 JD |
49 | */ |
| 50 | pthread_mutex_t lock; | |
| 51 | }; | |
| 52 | ||
| b1316da1 | 53 | enum consumer_metadata_cache_write_status |
| a25d34bc | 54 | consumer_metadata_cache_write(struct consumer_metadata_cache *cache, |
| 93ec662e | 55 | unsigned int offset, unsigned int len, uint64_t version, |
| d44f9a18 | 56 | const char *data); |
| 331744e3 JD |
57 | int consumer_metadata_cache_allocate(struct lttng_consumer_channel *channel); |
| 58 | void consumer_metadata_cache_destroy(struct lttng_consumer_channel *channel); | |
| 59 | int consumer_metadata_cache_flushed(struct lttng_consumer_channel *channel, | |
| 5e41ebe1 | 60 | uint64_t offset, int timer); |
| 331744e3 JD |
61 | |
| 62 | #endif /* CONSUMER_METADATA_CACHE_H */ |