Cleanup: relayd: centralize thread stopping function

Rather than relying on having main.c and live.c threads both using the
same notification pipe from different stop_thread implementations,
centralize thread stop in one central function exposed to both main.c
and live.c

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

diff --git a/src/bin/lttng-relayd/live.c b/src/bin/lttng-relayd/live.c
index 4963043edbe390d1f78d70a90656441e67f24bab..bedf13df666d2696c4fffa84e271a7f5558efffd 100644 (file)
--- a/src/bin/lttng-relayd/live.c
+++ b/src/bin/lttng-relayd/live.c
@@ -325,42 +325,12 @@ error_unlock:
        return ret;
 }
 
-/*
- * Write to writable pipe used to notify a thread.
- */
-static
-int notify_thread_pipe(int wpipe)
-{
-       ssize_t ret;
-
-       ret = lttng_write(wpipe, "!", 1);
-       if (ret < 1) {
-               PERROR("write poll pipe");
-       }
-
-       return (int) ret;
-}
-
-/*
- * Stop all threads by closing the thread quit pipe.
- */
-static
-int stop_threads(void)
+int relayd_live_stop(void)
 {
-       int ret, retval = 0;
-
-       /* Stopping all threads */
-       DBG("Terminating all live threads");
-       ret = notify_thread_pipe(thread_quit_pipe[1]);
-       if (ret < 0) {
-               ERR("write error on thread quit pipe");
-               retval = -1;
-       }
-
-       /* Dispatch thread */
+       /* Stop dispatch thread */
        CMM_STORE_SHARED(live_dispatch_thread_exit, 1);
        futex_nto1_wake(&viewer_conn_queue.futex);
-       return retval;
+       return 0;
 }
 
 /*
@@ -597,8 +567,8 @@ error_sock_control:
        }
        health_unregister(health_relayd);
        DBG("Live viewer listener thread cleanup complete");
-       if (stop_threads()) {
-               ERR("Error stopping live threads");
+       if (lttng_relay_stop_threads()) {
+               ERR("Error stopping threads");
        }
        return NULL;
 }
@@ -676,8 +646,8 @@ error_testpoint:
        }
        health_unregister(health_relayd);
        DBG("Live viewer dispatch thread dying");
-       if (stop_threads()) {
-               ERR("Error stopping live threads");
+       if (lttng_relay_stop_threads()) {
+               ERR("Error stopping threads");
        }
        return NULL;
 }
@@ -2052,8 +2022,8 @@ error_testpoint:
                ERR("Health error occurred in %s", __func__);
        }
        health_unregister(health_relayd);
-       if (stop_threads()) {
-               ERR("Error stopping live threads");
+       if (lttng_relay_stop_threads()) {
+               ERR("Error stopping threads");
        }
        rcu_unregister_thread();
        return NULL;
@@ -2068,11 +2038,6 @@ static int create_conn_pipe(void)
        return utils_create_pipe_cloexec(live_conn_pipe);
 }
 
-int relayd_live_stop(void)
-{
-       return stop_threads();
-}
-
 int relayd_live_join(void)
 {
        int ret, retval = 0;

diff --git a/src/bin/lttng-relayd/lttng-relayd.h b/src/bin/lttng-relayd/lttng-relayd.h
index 896925f9e16be3e10655d00e5253051b3098107c..0611a8ceace074dc8d2068644c59ff22bf07e767 100644 (file)
--- a/src/bin/lttng-relayd/lttng-relayd.h
+++ b/src/bin/lttng-relayd/lttng-relayd.h
@@ -58,5 +58,6 @@ extern const char * const config_section_name;
 extern int thread_quit_pipe[2];
 
 void lttng_relay_notify_ready(void);
+int lttng_relay_stop_threads(void);
 
 #endif /* LTTNG_RELAYD_H */

diff --git a/src/bin/lttng-relayd/main.c b/src/bin/lttng-relayd/main.c
index 5147ef786ebc3a1e816ef828e9e95332c9a5a2fd..50dff9e5ba371abecb9c56269674073d5cd36f40 100644 (file)
--- a/src/bin/lttng-relayd/main.c
+++ b/src/bin/lttng-relayd/main.c
@@ -493,46 +493,55 @@ int notify_thread_pipe(int wpipe)
        ret = lttng_write(wpipe, "!", 1);
        if (ret < 1) {
                PERROR("write poll pipe");
+               goto end;
        }
-
+       ret = 0;
+end:
        return ret;
 }
 
-static void notify_health_quit_pipe(int *pipe)
+static
+int notify_health_quit_pipe(int *pipe)
 {
        ssize_t ret;
 
        ret = lttng_write(pipe[1], "4", 1);
        if (ret < 1) {
                PERROR("write relay health quit");
+               goto end;
        }
+       ret = 0;
+end:
+       return ret;
 }
 
 /*
- * Stop all threads by closing the thread quit pipe.
+ * Stop all relayd and relayd-live threads.
  */
-static
-void stop_threads(void)
+int lttng_relay_stop_threads(void)
 {
-       int ret;
+       int retval = 0;
 
        /* Stopping all threads */
        DBG("Terminating all threads");
-       ret = notify_thread_pipe(thread_quit_pipe[1]);
-       if (ret < 0) {
+       if (notify_thread_pipe(thread_quit_pipe[1])) {
                ERR("write error on thread quit pipe");
+               retval = -1;
        }
 
-       notify_health_quit_pipe(health_quit_pipe);
+       if (notify_health_quit_pipe(health_quit_pipe)) {
+               ERR("write error on health quit pipe");
+       }
 
        /* Dispatch thread */
        CMM_STORE_SHARED(dispatch_thread_exit, 1);
        futex_nto1_wake(&relay_conn_queue.futex);
 
-       ret = relayd_live_stop();
-       if (ret) {
+       if (relayd_live_stop()) {
                ERR("Error stopping live threads");
+               retval = -1;
        }
+       return retval;
 }
 
 /*
@@ -550,11 +559,15 @@ void sighandler(int sig)
                return;
        case SIGINT:
                DBG("SIGINT caught");
-               stop_threads();
+               if (lttng_relay_stop_threads()) {
+                       ERR("Error stopping threads");
+               }
                break;
        case SIGTERM:
                DBG("SIGTERM caught");
-               stop_threads();
+               if (lttng_relay_stop_threads()) {
+                       ERR("Error stopping threads");
+               }
                break;
        case SIGUSR1:
                CMM_STORE_SHARED(recv_child_signal, 1);
@@ -952,7 +965,7 @@ error_sock_control:
        }
        health_unregister(health_relayd);
        DBG("Relay listener thread cleanup complete");
-       stop_threads();
+       lttng_relay_stop_threads();
        return NULL;
 }
 
@@ -1028,7 +1041,7 @@ error_testpoint:
        }
        health_unregister(health_relayd);
        DBG("Dispatch thread dying");
-       stop_threads();
+       lttng_relay_stop_threads();
        return NULL;
 }
 
@@ -2722,7 +2735,7 @@ error_testpoint:
        }
        health_unregister(health_relayd);
        rcu_unregister_thread();
-       stop_threads();
+       lttng_relay_stop_threads();
        return NULL;
 }