Fix: consumer health state

Fixes #389

Signed-off-by: David Goulet <dgoulet@efficios.com>

diff --git a/src/bin/lttng-sessiond/main.c b/src/bin/lttng-sessiond/main.c
index b4755b0b8cce0d7eba70d60d4a474345ba2bbd1c..9818b39569d9ee77eb84078d15ed5f12ad2f08ad 100644 (file)
--- a/src/bin/lttng-sessiond/main.c
+++ b/src/bin/lttng-sessiond/main.c
@@ -838,6 +838,25 @@ static void *thread_manage_consumer(void *data)
 
        DBG("[thread] Manage consumer started");
 
+       /*
+        * Since the consumer thread can be spawned at any moment in time, we init
+        * the health to a poll status (1, which is a valid health over time).
+        * When the thread starts, we update here the health to a "code" path being
+        * an even value so this thread, when reaching a poll wait, does not
+        * trigger an error with an even value.
+        *
+        * Here is the use case we avoid.
+        *
+        * +1: the first poll update during initialization (main())
+        * +2 * x: multiple code update once in this thread.
+        * +1: poll wait in this thread (being a good health state).
+        * == even number which after the wait period shows as a bad health.
+        *
+        * In a nutshell, the following poll update to the health state brings back
+        * the state to an even value meaning a code path.
+        */
+       health_poll_update(&consumer_data->health);
+
        health_code_update(&consumer_data->health);
 
        ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
@@ -3977,7 +3996,9 @@ int main(int argc, char **argv)
        /*
         * Init health counters of the consumer thread. We do a quick hack here to
         * the state of the consumer health is fine even if the thread is not
-        * started.  This is simply to ease our life and has no cost what so ever.
+        * started. Once the thread starts, the health state is updated with a poll
+        * value to set a health code path. This is simply to ease our life and has
+        * no cost what so ever.
         */
        health_init(&kconsumer_data.health);
        health_poll_update(&kconsumer_data.health);