X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Fconsumer.h;h=87ba490d7500af8ea078cec6ab652495ab5c91d5;hp=df002f81a606c62f75db59bf23d752ec29743e62;hb=74251bb8269c4609c776e28fcd137628225e6ca7;hpb=ca22feea083301934d1c8511851c86fb008c0697

diff --git a/src/common/consumer.h b/src/common/consumer.h
index df002f81a..87ba490d7 100644
--- a/src/common/consumer.h
+++ b/src/common/consumer.h
@@ -30,21 +30,6 @@
 #include <common/compat/fcntl.h>
 #include <common/sessiond-comm/sessiond-comm.h>
 
-/*
- * When the receiving thread dies, we need to have a way to make the polling
- * thread exit eventually. If all FDs hang up (normal case when the
- * lttng-sessiond stops), we can exit cleanly, but if there is a problem and
- * for whatever reason some FDs remain open, the consumer should still exit
- * eventually.
- *
- * If the timeout is reached, it means that during this period no events
- * occurred on the FDs so we need to force an exit. This case should not happen
- * but it is a safety to ensure we won't block the consumer indefinitely.
- *
- * The value of 2 seconds is an arbitrary choice.
- */
-#define LTTNG_CONSUMER_POLL_TIMEOUT 2000
-
 /* Commands for consumer */
 enum lttng_consumer_command {
 	LTTNG_CONSUMER_ADD_CHANNEL,
@@ -57,7 +42,7 @@ enum lttng_consumer_command {
 	/* Inform the consumer to kill a specific relayd connection */
 	LTTNG_CONSUMER_DESTROY_RELAYD,
 	/* Return to the sessiond if there is data pending for a session */
-	LTTNG_CONSUMER_DATA_AVAILABLE,
+	LTTNG_CONSUMER_DATA_PENDING,
 };
 
 /* State of each fd in consumer */
@@ -74,6 +59,11 @@ enum lttng_consumer_type {
 	LTTNG_CONSUMER32_UST,
 };
 
+enum consumer_endpoint_status {
+	CONSUMER_ENDPOINT_ACTIVE,
+	CONSUMER_ENDPOINT_INACTIVE,
+};
+
 struct lttng_consumer_channel {
 	struct lttng_ht_node_ulong node;
 	int key;
@@ -141,10 +131,22 @@ struct lttng_consumer_stream {
 	uint64_t relayd_stream_id;
 	/* Next sequence number to use for trace packet */
 	uint64_t next_net_seq_num;
-	/* Lock to use the stream FDs since they are used between threads. */
+	/*
+	 * Lock to use the stream FDs since they are used between threads.
+	 *
+	 * This is nested INSIDE the consumer_data lock.
+	 * This is nested OUTSIDE consumer_relayd_sock_pair lock.
+	 */
 	pthread_mutex_t lock;
 	/* Tracing session id */
 	uint64_t session_id;
+	/*
+	 * Indicates if the stream end point is still active or not (network
+	 * streaming or local file system). The thread "owning" the stream is
+	 * handling this status and can be notified of a state change through the
+	 * consumer data appropriate pipe.
+	 */
+	enum consumer_endpoint_status endpoint_status;
 };
 
 /*
@@ -168,6 +170,9 @@ struct consumer_relayd_sock_pair {
 	 * between threads sending data to the relayd. Since metadata data is sent
 	 * over that socket, at least two sendmsg() are needed (header + data)
 	 * creating a race for packets to overlap between threads using it.
+	 *
+	 * This is nested INSIDE the consumer_data lock.
+	 * This is nested INSIDE the stream lock.
 	 */
 	pthread_mutex_t ctrl_sock_mutex;
 
@@ -255,8 +260,8 @@ struct lttng_consumer_global_data {
 	 * and number of element in the hash table. It's also a protection for
 	 * concurrent read/write between threads.
 	 *
-	 * XXX: We need to see if this lock is still needed with the lockless RCU
-	 * hash tables.
+	 * This is nested OUTSIDE the stream lock.
+	 * This is nested OUTSIDE the consumer_relayd_sock_pair lock.
 	 */
 	pthread_mutex_t lock;
 
@@ -291,10 +296,6 @@ struct lttng_consumer_global_data {
 	struct lttng_ht *stream_list_ht;
 };
 
-/* Defined in consumer.c and coupled with explanations */
-extern struct lttng_ht *metadata_ht;
-extern struct lttng_ht *data_ht;
-
 /*
  * Init consumer data structures.
  */
@@ -414,6 +415,6 @@ int consumer_add_relayd_socket(int net_seq_idx, int sock_type,
 		struct pollfd *consumer_sockpoll, struct lttcomm_sock *relayd_sock);
 void consumer_flag_relayd_for_destroy(
 		struct consumer_relayd_sock_pair *relayd);
-int consumer_data_available(uint64_t id);
+int consumer_data_pending(uint64_t id);
 
 #endif /* LIB_CONSUMER_H */