2 * Copyright (C) 2019 Jérémie Galarneau <jeremie.galarneau@efficios.com>
4 * SPDX-License-Identifier: GPL-2.0-only
8 #ifndef SESSIOND_TRACE_CHUNK_REGISTRY_H
9 #define SESSIOND_TRACE_CHUNK_REGISTRY_H
11 #include <common/trace-chunk.hpp>
12 #include <common/uuid.hpp>
17 * A session trace chunk registry allows the relay daemon to share trace chunks
18 * used by different "relay sessions" when they were created for the same
19 * user-visible session daemon session. Tracing multiple domains (e.g. ust and
20 * kernel) results in per-domain relay sessions being created.
22 * Sharing trace chunks, and their output directory more specifically, is
23 * essential to properly implement session rotations. The sharing of output
24 * directory handles allows directory renames to be performed once and without
25 * races that would stem from from multiple renames.
27 struct sessiond_trace_chunk_registry;
29 struct sessiond_trace_chunk_registry *sessiond_trace_chunk_registry_create();
31 void sessiond_trace_chunk_registry_destroy(struct sessiond_trace_chunk_registry *sessiond_registry);
33 int sessiond_trace_chunk_registry_session_created(
34 struct sessiond_trace_chunk_registry *sessiond_registry, const lttng_uuid& sessiond_uuid);
36 int sessiond_trace_chunk_registry_session_destroyed(
37 struct sessiond_trace_chunk_registry *sessiond_registry, const lttng_uuid& sessiond_uuid);
39 struct lttng_trace_chunk *
40 sessiond_trace_chunk_registry_publish_chunk(struct sessiond_trace_chunk_registry *sessiond_registry,
41 const lttng_uuid& sessiond_uuid,
43 struct lttng_trace_chunk *chunk);
45 struct lttng_trace_chunk *sessiond_trace_chunk_registry_get_anonymous_chunk(
46 struct sessiond_trace_chunk_registry *sessiond_registry,
47 const lttng_uuid& sessiond_uuid,
50 struct lttng_trace_chunk *
51 sessiond_trace_chunk_registry_get_chunk(struct sessiond_trace_chunk_registry *sessiond_registry,
52 const lttng_uuid& sessiond_uuid,
56 int sessiond_trace_chunk_registry_chunk_exists(
57 struct sessiond_trace_chunk_registry *sessiond_registry,
58 const lttng_uuid& sessiond_uuid,
63 #endif /* SESSIOND_TRACE_CHUNK_REGISTRY_H */