projects / lttng-tools.git / blame
| Commit | Line | Data |
|---|---|---|
| 7591bab1 MD |
1 | #ifndef _VIEWER_SESSION_H |
| 2 | #define _VIEWER_SESSION_H | |
| 3 | ||
| 4 | /* | |
| ab5be9fa MJ |
5 | * Copyright (C) 2013 Julien Desfossez <jdesfossez@efficios.com> |
| 6 | * Copyright (C) 2013 David Goulet <dgoulet@efficios.com> | |
| 7 | * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
| 7591bab1 | 8 | * |
| ab5be9fa | 9 | * SPDX-License-Identifier: GPL-2.0-only |
| 7591bab1 | 10 | * |
| 7591bab1 MD |
11 | */ |
| 12 | ||
| 13 | #include <limits.h> | |
| 14 | #include <inttypes.h> | |
| 15 | #include <pthread.h> | |
| 16 | #include <urcu/list.h> | |
| 17 | #include <urcu/ref.h> | |
| 18 | ||
| 19 | #include <common/hashtable/hashtable.h> | |
| b66a15d1 | 20 | #include <common/trace-chunk.h> |
| 7591bab1 MD |
21 | |
| 22 | #include "session.h" | |
| 23 | ||
| 24 | struct relay_viewer_session { | |
| 25 | /* | |
| 26 | * Session list. Updates are protected by the session_list_lock. | |
| 27 | * Traversals are protected by RCU. | |
| 28 | * This list limits the design to having the sessions in at most | |
| 29 | * one viewer session. | |
| 30 | */ | |
| 31 | struct cds_list_head session_list; /* RCU list. */ | |
| 32 | pthread_mutex_t session_list_lock; /* Protects list updates. */ | |
| 8aeeba8f JG |
33 | /* |
| 34 | * The viewer session's current trace chunk is initially set, when | |
| 35 | * a viewer attaches to the viewer session, to a copy the corresponding | |
| 36 | * relay_session's current trace chunk. | |
| 37 | * | |
| 38 | * A live session always attempts to "catch-up" to the newest available | |
| 39 | * trace chunk. This means that when a viewer reaches the end of a | |
| 40 | * trace chunk, the viewer session may not transition to the "next" one: | |
| 41 | * it jumps to the most recent trace chunk available (the one being | |
| 42 | * produced by the relay_session). Hence, if the producer performs | |
| 43 | * multiple rotations before a viewer completes the consumption of a | |
| 44 | * trace chunk, it will skip over those "intermediary" trace chunks. | |
| 45 | * | |
| 46 | * A viewer session updates its current trace chunk when: | |
| 47 | * 1) new viewer streams are created, | |
| 48 | * 2) a new index is requested, | |
| 49 | * 3) metadata is requested. | |
| 50 | * | |
| 51 | * Hence, as a general principle, the viewer session will reference the | |
| 52 | * most recent trace chunk available _even if its streams do not point to | |
| 53 | * it_. It indicates which trace chunk viewer streams should transition | |
| 54 | * to when the end of their current trace chunk is reached. | |
| 55 | */ | |
| b66a15d1 | 56 | struct lttng_trace_chunk *current_trace_chunk; |
| 7591bab1 MD |
57 | }; |
| 58 | ||
| 59 | struct relay_viewer_session *viewer_session_create(void); | |
| 60 | void viewer_session_destroy(struct relay_viewer_session *vsession); | |
| 61 | void viewer_session_close(struct relay_viewer_session *vsession); | |
| 62 | ||
| dbd6665b JG |
63 | enum lttng_viewer_attach_return_code viewer_session_attach( |
| 64 | struct relay_viewer_session *vsession, | |
| 7591bab1 MD |
65 | struct relay_session *session); |
| 66 | int viewer_session_is_attached(struct relay_viewer_session *vsession, | |
| 67 | struct relay_session *session); | |
| d62023be JD |
68 | void viewer_session_close_one_session(struct relay_viewer_session *vsession, |
| 69 | struct relay_session *session); | |
| b3ab5004 MD |
70 | int viewer_session_set_trace_chunk_copy(struct relay_viewer_session *vsession, |
| 71 | struct lttng_trace_chunk *relay_session_trace_chunk); | |
| 7591bab1 MD |
72 | |
| 73 | #endif /* _VIEWER_SESSION_H */ |