| 1 | /* |
| 2 | * Copyright (C) 2013 Julien Desfossez <jdesfossez@efficios.com> |
| 3 | * Copyright (C) 2013 David Goulet <dgoulet@efficios.com> |
| 4 | * |
| 5 | * SPDX-License-Identifier: GPL-2.0-only |
| 6 | * |
| 7 | */ |
| 8 | |
| 9 | #ifndef CONSUMER_METADATA_CACHE_H |
| 10 | #define CONSUMER_METADATA_CACHE_H |
| 11 | |
| 12 | #include <common/consumer/consumer.h> |
| 13 | |
| 14 | struct consumer_metadata_cache { |
| 15 | char *data; |
| 16 | uint64_t cache_alloc_size; |
| 17 | /* |
| 18 | * Current version of the metadata cache. |
| 19 | */ |
| 20 | uint64_t version; |
| 21 | /* |
| 22 | * The upper-limit of data written inside the buffer. |
| 23 | * |
| 24 | * With the total_bytes_written it allows us to keep track of when the |
| 25 | * cache contains contiguous metadata ready to be sent to the RB. |
| 26 | * All cached data is contiguous. |
| 27 | */ |
| 28 | uint64_t max_offset; |
| 29 | /* |
| 30 | * Lock to update the metadata cache and push into the ring_buffer |
| 31 | * (ustctl_write_metadata_to_channel). |
| 32 | * |
| 33 | * This is nested INSIDE the consumer_data lock. |
| 34 | */ |
| 35 | pthread_mutex_t lock; |
| 36 | }; |
| 37 | |
| 38 | int consumer_metadata_cache_write(struct lttng_consumer_channel *channel, |
| 39 | unsigned int offset, unsigned int len, uint64_t version, |
| 40 | char *data); |
| 41 | int consumer_metadata_cache_allocate(struct lttng_consumer_channel *channel); |
| 42 | void consumer_metadata_cache_destroy(struct lttng_consumer_channel *channel); |
| 43 | int consumer_metadata_cache_flushed(struct lttng_consumer_channel *channel, |
| 44 | uint64_t offset, int timer); |
| 45 | int consumer_metadata_wakeup_pipe(const struct lttng_consumer_channel *channel); |
| 46 | |
| 47 | #endif /* CONSUMER_METADATA_CACHE_H */ |