Cleanup: ust_session_id unused by buffer_reg_uid_consumer_channel_key

[lttng-tools.git] / src / bin / lttng-sessiond / main.c

diff --git a/src/bin/lttng-sessiond/main.c b/src/bin/lttng-sessiond/main.c
index 9c2458eb1a15a1bee49d1a1babe3d0390418390e..e032e037c3ebf933f0caa216cd292578fbb7e9ae 100644 (file)
--- a/src/bin/lttng-sessiond/main.c
+++ b/src/bin/lttng-sessiond/main.c
@@ -4574,8 +4574,17 @@ static void *thread_manage_clients(void *data)
                if (ret > 0 || (ret < 0 && errno != EINTR)) {
                        goto exit;
                }
-               cmm_smp_rmb();
        }
+       /*
+        * This barrier is paired with the one in sessiond_notify_ready() to
+        * ensure that loads accessing data initialized by the other threads,
+        * on which this thread was waiting, are not performed before this point.
+        *
+        * Note that this could be a 'read' memory barrier, but a full barrier
+        * is used in case the code changes. The performance implications of
+        * this choice are minimal since this is a slow path.
+        */
+       cmm_smp_mb();
 
        /* This testpoint is after we signal readiness to the parent. */
        if (testpoint(sessiond_thread_manage_clients)) {
@@ -5821,6 +5830,12 @@ int main(int argc, char **argv)
                goto exit_set_signal_handler;
        }
 
+       /*
+        * Init config from environment variables.
+        * Command line option override env configuration per-doc. Do env first.
+        */
+       sessiond_config_apply_env_config(&config);
+
        /*
         * Parse arguments and load the daemon configuration file.
         *
@@ -5835,9 +5850,6 @@ int main(int argc, char **argv)
                goto exit_options;
        }
 
-       /* Init config from environment variables. */
-       sessiond_config_apply_env_config(&config);
-
        /*
         * Resolve all paths received as arguments, configuration option, or
         * through environment variable as absolute paths. This is necessary