Add the sessiond notification-handling subsystem

[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 5e19f379fbb05675a7d809d7878caa39c5c82b18..deb2edf9ba1e5189cd1d9e40934abfc3da1e43ab 100644 (file)
--- a/src/bin/lttng-sessiond/main.c
+++ b/src/bin/lttng-sessiond/main.c
@@ -1855,6 +1855,8 @@ static void *thread_dispatch_ust_registration(void *data)
                .count = 0,
        };
 
+       rcu_register_thread();
+
        health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH);
 
        if (testpoint(sessiond_thread_app_reg_dispatch)) {
@@ -2088,6 +2090,7 @@ error_testpoint:
                ERR("Health error occurred in %s", __func__);
        }
        health_unregister(health_sessiond);
+       rcu_unregister_thread();
        return NULL;
 }
 
@@ -2195,10 +2198,12 @@ static void *thread_registration_apps(void *data)
                                         * lttcomm_setsockopt_snd_timeout expect msec as
                                         * parameter.
                                         */
-                                       (void) lttcomm_setsockopt_rcv_timeout(sock,
-                                                       app_socket_timeout * 1000);
-                                       (void) lttcomm_setsockopt_snd_timeout(sock,
-                                                       app_socket_timeout * 1000);
+                                       if (app_socket_timeout >= 0) {
+                                               (void) lttcomm_setsockopt_rcv_timeout(sock,
+                                                               app_socket_timeout * 1000);
+                                               (void) lttcomm_setsockopt_snd_timeout(sock,
+                                                               app_socket_timeout * 1000);
+                                       }
 
                                        /*
                                         * Set the CLOEXEC flag. Return code is useless because
@@ -3056,7 +3061,6 @@ static int process_client_msg(struct command_ctx *cmd_ctx, int sock,
        case LTTNG_CREATE_SESSION:
        case LTTNG_CREATE_SESSION_SNAPSHOT:
        case LTTNG_CREATE_SESSION_LIVE:
-       case LTTNG_CALIBRATE:
        case LTTNG_LIST_SESSIONS:
        case LTTNG_LIST_TRACEPOINTS:
        case LTTNG_LIST_SYSCALLS:
@@ -3898,12 +3902,6 @@ error_add_context:
                ret = LTTNG_OK;
                break;
        }
-       case LTTNG_CALIBRATE:
-       {
-               ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
-                               &cmd_ctx->lsm->u.calibrate);
-               break;
-       }
        case LTTNG_REGISTER_CONSUMER:
        {
                struct consumer_data *cdata;
@@ -4330,7 +4328,7 @@ error:
        }
 
        lttng_poll_clean(&events);
-
+       stop_threads();
        rcu_unregister_thread();
        return NULL;
 }
@@ -5368,9 +5366,6 @@ error:
 static void sighandler(int sig)
 {
        switch (sig) {
-       case SIGPIPE:
-               DBG("SIGPIPE caught");
-               return;
        case SIGINT:
                DBG("SIGINT caught");
                stop_threads();
@@ -5402,9 +5397,10 @@ static int set_signal_handler(void)
                return ret;
        }
 
-       sa.sa_handler = sighandler;
        sa.sa_mask = sigset;
        sa.sa_flags = 0;
+
+       sa.sa_handler = sighandler;
        if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
                PERROR("sigaction");
                return ret;
@@ -5415,12 +5411,13 @@ static int set_signal_handler(void)
                return ret;
        }
 
-       if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
+       if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) {
                PERROR("sigaction");
                return ret;
        }
 
-       if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) {
+       sa.sa_handler = SIG_IGN;
+       if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
                PERROR("sigaction");
                return ret;
        }
@@ -5976,7 +5973,7 @@ int main(int argc, char **argv)
        }
        load_info->path = opt_load_session_path;
 
-       /* Create health-check thread */
+       /* Create health-check thread. */
        ret = pthread_create(&health_thread, default_pthread_attr(),
                        thread_manage_health, (void *) NULL);
        if (ret) {
@@ -6153,6 +6150,12 @@ exit_client:
 exit_health:
 
 exit_init_data:
+       /*
+        * Wait for all pending call_rcu work to complete before tearing
+        * down data structures. call_rcu worker may be trying to
+        * perform lookups in those structures.
+        */
+       rcu_barrier();
        /*
         * sessiond_cleanup() is called when no other thread is running, except
         * the ht_cleanup thread, which is needed to destroy the hash tables.