--- rpl/src/instructions_s1.c	2019/02/09 13:36:40	1.100
+++ rpl/src/instructions_s1.c	2019/02/11 09:45:52	1.101
@@ -3676,6 +3676,12 @@ instruction_syseval(struct_processus *s_
 		action_courante.sa_handler = SIG_IGN;
 		action_courante.sa_flags = 0;
 
+		if (pthread_mutex_lock(&mutex_sigaction) != 0)
+		{
+			(*s_etat_processus).erreur_systeme = d_es_processus;
+			return;
+		}
+
 		if (sigaction(SIGINT, &action_courante, &action_passee) != 0)
 		{
 			for(i = 0; i < nombre_arguments; i++)
@@ -3837,6 +3843,12 @@ instruction_syseval(struct_processus *s_
 				return;
 			}
 
+			if (pthread_mutex_unlock(&mutex_sigaction) != 0)
+			{
+				(*s_etat_processus).erreur_systeme = d_es_processus;
+				return;
+			}
+
 			deverrouillage_threads_concurrents(s_etat_processus);
 
 			if (close(pipes_entree[0]) != 0)