Use signal handlers from sender and receiver threads in the connector avoid needing to pthread tryjoin on every message

src/ckpool.c

@@ -202,8 +202,6 @@ bool ckmsgq_empty(ckmsgq_t *ckmsgq)
 	return ret;
 }
 
-static void childsighandler(const int sig);
-
 /* Create a standalone thread that queues received unix messages for a proc
  * instance and adds them to linked list of received messages with their
  * associated receive socket, then signal the associated rmsg_cond for the
@@ -879,7 +877,7 @@ static void rm_namepid(const proc_instance_t *pi)
 
 /* Disable signal handlers for child processes, but simply pass them onto the
  * parent process to shut down cleanly. */
-static void childsighandler(const int sig)
+void childsighandler(const int sig)
 {
 	signal(sig, SIG_IGN);
 	signal(SIGTERM, SIG_IGN);

src/ckpool.h

@@ -255,6 +255,7 @@ char *_ckdb_msg_call(const ckpool_t *ckp, const char *msg,  const char *file, co
 
 json_t *json_rpc_call(connsock_t *cs, const char *rpc_req);
 
+void childsighandler(const int sig);
 int process_exit(ckpool_t *ckp, const proc_instance_t *pi, int ret);
 bool json_get_string(char **store, const json_t *val, const char *res);
 bool json_get_int64(int64_t *store, const json_t *val, const char *res);

src/connector.c

@@ -450,7 +450,7 @@ void *receiver(void *arg)
 	epfd = cdata->epfd = epoll_create1(EPOLL_CLOEXEC);
 	if (epfd < 0) {
 		LOGEMERG("FATAL: Failed to create epoll in receiver");
-		return NULL;
+		goto out;
 	}
 	serverfds = cdata->ckp->serverurls;
 	/* Add all the serverfds to the epoll */
@@ -461,7 +461,7 @@ void *receiver(void *arg)
 		ret = epoll_ctl(epfd, EPOLL_CTL_ADD, cdata->serverfd[i], &event);
 		if (ret < 0) {
 			LOGEMERG("FATAL: Failed to add epfd %d to epoll_ctl", epfd);
-			return NULL;
+			goto out;
 		}
 	}
 
@@ -541,6 +541,9 @@ void *receiver(void *arg)
 noparse:
 		dec_instance_ref(cdata, client);
 	}
+out:
+	/* We shouldn't get here unless there's an error */
+	childsighandler(15);
 	return NULL;
 }
 
@@ -641,7 +644,8 @@ contfree:
 		free(sender_send);
 		dec_instance_ref(cdata, client);
 	}
-
+	/* We shouldn't get here unless there's an error */
+	childsighandler(15);
 	return NULL;
 }
 
@@ -804,7 +808,6 @@ static int connector_loop(proc_instance_t *pi, cdata_t *cdata)
 {
 	unix_msg_t *umsg = NULL;
 	ckpool_t *ckp = pi->ckp;
-	uint8_t test_cycle = 0;
 	int64_t client_id;
 	char *buf;
 	int ret = 0;
@@ -818,20 +821,6 @@ retry:
 		dealloc(umsg);
 	}
 
-	if (!++test_cycle) {
-		/* Test for pthread join every 256 messages */
-		if (unlikely(!pthread_tryjoin_np(cdata->pth_sender, NULL))) {
-			LOGEMERG("Connector sender thread shutdown, exiting");
-			ret = 1;
-			goto out;
-		}
-		if (unlikely(!pthread_tryjoin_np(cdata->pth_receiver, NULL))) {
-			LOGEMERG("Connector receiver thread shutdown, exiting");
-			ret = 1;
-			goto out;
-		}
-	}
-
 	do {
 		umsg = get_unix_msg(pi);
 	} while (!umsg);