--- libaitsched/src/aitsched.c	2023/02/23 15:41:45	1.30.2.3
+++ libaitsched/src/aitsched.c	2023/02/23 17:13:01	1.30.2.4
@@ -3,7 +3,7 @@
 *  by Michael Pounov <misho@openbsd-bg.org>
 *
 * $Author: misho $
-* $Id: aitsched.c,v 1.30.2.3 2023/02/23 15:41:45 misho Exp $
+* $Id: aitsched.c,v 1.30.2.4 2023/02/23 17:13:01 misho Exp $
 *
 **************************************************************************
 The ELWIX and AITNET software is distributed under the following
@@ -1123,14 +1123,29 @@ schedResumeby(sched_root_task_t * __restrict root, u_c
 static void *
 _sched_sigDisp(void *arg)
 {
-	sched_root_task_t *sched = arg;
-	sigset_t ss;
-	int sig;
+	sched_root_task_t *root = arg;
+	sched_task_t *task, *tmp;
+	int sig, flg;
 
-	sigfillset(&ss);
-	while (sched->root_sigthr) {
-		sigwait(&ss, &sig);
+	while (root->root_sigthr) {
+		if (sigwait(&root->root_sigset, &sig))
+			continue;
 
+		flg = 0;
+		TAILQ_FOREACH_SAFE(task, &root->root_signal, task_node, tmp) {
+			if (TASK_VAL(task) == (uintptr_t) sig) {
+				if (!flg) {
+					TASK_RET(task) = 0;
+					TASK_FLAG(task) = 0;
+
+					/* remove signal handle */
+					transit_task2ready(task, &root->root_signal);
+				}
+				flg++;
+			}
+		}
+		if (flg < 2)
+			sigdelset(&root->root_sigset, sig);
 	}
 
 	return NULL;