X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fsession.h;h=82e409521c440c621f06d5d46a86d8cc380e6d6c;hp=48dc44a33d632efaff87598d1057f7569b83e584;hb=92fe5ca1528abfa90cc26f767d274dbff61ffc61;hpb=d7ba13889c8692b14f99238ddf2721ed78df89d2 diff --git a/src/bin/lttng-sessiond/session.h b/src/bin/lttng-sessiond/session.h index 48dc44a33..82e409521 100644 --- a/src/bin/lttng-sessiond/session.h +++ b/src/bin/lttng-sessiond/session.h @@ -19,12 +19,16 @@ #define _LTT_SESSION_H #include +#include #include #include +#include +#include #include "snapshot.h" #include "trace-kernel.h" +#include "consumer.h" struct ltt_ust_session; @@ -43,6 +47,11 @@ struct ltt_session_list { * iterate or/and do any actions on that list. */ pthread_mutex_t lock; + /* + * This condition variable is signaled on every removal from + * the session list. + */ + pthread_cond_t removal_cond; /* * Session unique ID generator. The session list lock MUST be @@ -63,6 +72,7 @@ struct ltt_session { char hostname[HOST_NAME_MAX]; /* Local hostname. */ struct ltt_kernel_session *kernel_session; struct ltt_ust_session *ust_session; + struct urcu_ref ref; /* * Protect any read/write on this session data structure. This lock must be * acquired *before* using any public functions declared below. Use @@ -71,6 +81,10 @@ struct ltt_session { pthread_mutex_t lock; struct cds_list_head list; uint64_t id; /* session unique identifier */ + /* Indicates if the session has been added to the session list and ht.*/ + bool published; + /* Indicates if a destroy command has been applied to this session. */ + bool destroyed; /* UID/GID of the user owning the session */ uid_t uid; gid_t gid; @@ -100,9 +114,11 @@ struct ltt_session { /* Indicate if the session has to output the traces or not. */ unsigned int output_traces; /* - * This session is in snapshot mode. This means that every channel enabled - * will be set in overwrite mode and mmap. It is considered exclusively for - * snapshot purposes. + * This session is in snapshot mode. This means that channels enabled + * will be set in overwrite mode by default and must be in mmap + * output mode. Note that snapshots can be taken on a session that + * is not in "snapshot_mode". This parameter only affects channel + * creation defaults. */ unsigned int snapshot_mode; /* @@ -113,20 +129,125 @@ struct ltt_session { * Path where to keep the shared memory files. */ char shm_path[PATH_MAX]; + /* + * Node in ltt_sessions_ht_by_id. + */ + struct lttng_ht_node_u64 node; + /* + * The current archive id corresponds to the number of session rotations + * that have occurred for this session. The archive id + * is used to tag the "generation" of a stream. This tag allows the + * consumer and relay daemons to track when a given stream was created + * during the lifetime of a session. + * + * For instance, if a stream is created after a session rotation was + * launched, the consumer and relay daemons must not check its position + * to determine if that specific session rotation was completed. It is + * implicitly "completed" since the stream appeared _after_ the session + * rotation was initiated. + */ + uint64_t current_archive_id; + /* + * Rotation is considered pending between the time it is launched up + * until the moment when the data has been writen at the destination + * and the trace archive has been renamed. + * + * When tracing locally, only 'rotation_pending_local' is used since + * no remote checks are needed. However, when tracing to a relay daemon, + * a second check is needed to ensure that the data has been + * commited at the remote destination. + */ + bool rotation_pending_local; + bool rotation_pending_relay; + /* Current state of a rotation. */ + enum lttng_rotation_state rotation_state; + struct { + /* + * When the rotation is in progress, the temporary path name is + * stored here. When the rotation is complete, the final path name + * is here and can be queried with the rotate_pending call. + */ + char current_rotate_path[LTTNG_PATH_MAX]; + /* + * The path where the consumer is currently writing after the first + * session rotation. + */ + char active_tracing_path[LTTNG_PATH_MAX]; + } rotation_chunk; + /* + * The timestamp of the beginning of the previous chunk. For the + * first chunk, this is the "lttng start" timestamp. For the + * subsequent ones, this copies the current_chunk_start_ts value when + * a new rotation starts. This value is used to set the name of a + * complete chunk directory, ex: "last_chunk_start_ts-now()". + */ + time_t last_chunk_start_ts; + /* + * This is the timestamp when a new chunk starts. When a new rotation + * starts, we copy this value to last_chunk_start_ts and replace it + * with the current timestamp. + */ + time_t current_chunk_start_ts; + /* + * Timer to check periodically if a relay and/or consumer has completed + * the last rotation. + */ + bool rotation_pending_check_timer_enabled; + timer_t rotation_pending_check_timer; + /* Timer to periodically rotate a session. */ + bool rotation_schedule_timer_enabled; + timer_t rotation_schedule_timer; + /* Value for periodic rotations, 0 if disabled. */ + uint64_t rotate_timer_period; + /* Value for size-based rotations, 0 if disabled. */ + uint64_t rotate_size; + /* + * Keep a state if this session was rotated after the last stop command. + * We only allow one rotation after a stop. At destroy, we also need to + * know if a rotation occurred since the last stop to rename the current + * chunk. + */ + bool rotated_after_last_stop; + /* + * Condition and trigger for size-based rotations. + */ + struct lttng_condition *rotate_condition; + struct lttng_trigger *rotate_trigger; }; /* Prototypes */ int session_create(char *name, uid_t uid, gid_t gid); -int session_destroy(struct ltt_session *session); void session_lock(struct ltt_session *session); void session_lock_list(void); +int session_trylock_list(void); void session_unlock(struct ltt_session *session); void session_unlock_list(void); +void session_destroy(struct ltt_session *session); + +bool session_get(struct ltt_session *session); +void session_put(struct ltt_session *session); + +enum consumer_dst_type session_get_consumer_destination_type( + const struct ltt_session *session); +const char *session_get_net_consumer_hostname( + const struct ltt_session *session); +void session_get_net_consumer_ports( + const struct ltt_session *session, + uint16_t *control_port, uint16_t *data_port); +struct lttng_trace_archive_location *session_get_trace_archive_location( + struct ltt_session *session); + struct ltt_session *session_find_by_name(const char *name); +struct ltt_session *session_find_by_id(uint64_t id); + struct ltt_session_list *session_get_list(void); +void session_list_wait_empty(void); int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid); +int session_reset_rotation_state(struct ltt_session *session, + enum lttng_rotation_state result); + #endif /* _LTT_SESSION_H */