Launch the notification thread using lttng_thread
[lttng-tools.git] / src / bin / lttng-sessiond / notification-thread.c
index 4ce38e180e106986ae630a0c85483e93568405a3..9809e6190cd60cbb453cea62b704a62e6da84cc5 100644 (file)
@@ -37,6 +37,7 @@
 #include "notification-thread-commands.h"
 #include "lttng-sessiond.h"
 #include "health-sessiond.h"
+#include "thread.h"
 
 #include <urcu.h>
 #include <urcu/list.h>
@@ -56,6 +57,7 @@ void notification_thread_handle_destroy(
 
        assert(cds_list_empty(&handle->cmd_queue.list));
        pthread_mutex_destroy(&handle->cmd_queue.lock);
+       sem_destroy(&handle->ready);
 
        if (handle->cmd_queue.event_pipe) {
                lttng_pipe_destroy(handle->cmd_queue.event_pipe);
@@ -85,8 +87,7 @@ end:
 struct notification_thread_handle *notification_thread_handle_create(
                struct lttng_pipe *ust32_channel_monitor_pipe,
                struct lttng_pipe *ust64_channel_monitor_pipe,
-               struct lttng_pipe *kernel_channel_monitor_pipe,
-               sem_t *notification_thread_ready)
+               struct lttng_pipe *kernel_channel_monitor_pipe)
 {
        int ret;
        struct notification_thread_handle *handle;
@@ -97,6 +98,8 @@ struct notification_thread_handle *notification_thread_handle_create(
                goto end;
        }
 
+       sem_init(&handle->ready, 0, 0);
+
        event_pipe = lttng_pipe_open(FD_CLOEXEC);
        if (!event_pipe) {
                ERR("event_pipe creation");
@@ -142,7 +145,6 @@ struct notification_thread_handle *notification_thread_handle_create(
        } else {
                handle->channel_monitoring_pipes.kernel_consumer = -1;
        }
-       handle->notification_thread_ready = notification_thread_ready;
 end:
        return handle;
 error:
@@ -374,6 +376,21 @@ void fini_thread_state(struct notification_thread_state *state)
        lttng_poll_clean(&state->events);
 }
 
+static
+void mark_thread_as_ready(struct notification_thread_handle *handle)
+{
+       DBG("Marking notification thread as ready");
+       sem_post(&handle->ready);
+}
+
+static
+void wait_until_thread_is_ready(struct notification_thread_handle *handle)
+{
+       DBG("Waiting for notification thread to be ready");
+       sem_wait(&handle->ready);
+       DBG("Notification thread is ready");
+}
+
 static
 int init_thread_state(struct notification_thread_handle *handle,
                struct notification_thread_state *state)
@@ -448,7 +465,7 @@ int init_thread_state(struct notification_thread_handle *handle,
        if (!state->triggers_ht) {
                goto error;
        }
-       sem_post(handle->notification_thread_ready);
+       mark_thread_as_ready(handle);
 end:
        return 0;
 error:
@@ -496,6 +513,7 @@ end:
  * This thread services notification channel clients and commands received
  * from various lttng-sessiond components over a command queue.
  */
+static
 void *thread_notification(void *data)
 {
        int ret;
@@ -520,9 +538,6 @@ void *thread_notification(void *data)
                goto end;
        }
 
-       /* Ready to handle client connections. */
-       sessiond_notify_ready();
-
        while (true) {
                int fd_count, i;
 
@@ -628,3 +643,37 @@ error:
 end:
        return NULL;
 }
+
+static
+bool shutdown_notification_thread(void *thread_data)
+{
+       struct notification_thread_handle *handle = thread_data;
+
+       notification_thread_command_quit(handle);
+       return true;
+}
+
+bool launch_notification_thread(struct notification_thread_handle *handle)
+{
+       struct lttng_thread *thread;
+
+       thread = lttng_thread_create("Notification",
+                       thread_notification,
+                       shutdown_notification_thread,
+                       NULL,
+                       handle);
+       if (!thread) {
+               goto error;
+       }
+
+       /*
+        * Wait for the thread to be marked as "ready" before returning
+        * as other subsystems depend on the notification subsystem
+        * (e.g. rotation thread).
+        */
+       wait_until_thread_is_ready(handle);
+       lttng_thread_put(thread);
+       return true;
+error:
+       return false;
+}
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