--- rpl/src/instructions_s1.c	2019/02/07 15:47:41	1.98
+++ rpl/src/instructions_s1.c	2019/02/07 21:44:15	1.99
@@ -3688,6 +3688,8 @@ instruction_syseval(struct_processus *s_
 
 		fflush(NULL);
 
+		verrouillage_threads_concurrents(s_etat_processus);
+
 		pid = fork();
 
 		if (pid < 0)
@@ -3820,6 +3822,8 @@ instruction_syseval(struct_processus *s_
 		}
 		else
 		{
+			deverrouillage_threads_concurrents(s_etat_processus);
+
 			if (close(pipes_entree[0]) != 0)
 			{
 				(*s_etat_processus).erreur_systeme = d_es_processus;
@@ -4203,6 +4207,8 @@ instruction_syseval(struct_processus *s_
 			liberation(s_etat_processus, s_objet_temporaire);
 		}
 
+		free(arguments);
+
 		if ((tampon = malloc(sizeof(unsigned char))) == NULL)
 		{
 			(*s_etat_processus).erreur_systeme = d_es_allocation_memoire;
@@ -4272,7 +4278,6 @@ instruction_syseval(struct_processus *s_
 			return;
 		}
 
-		free(arguments);
 		free(tampon);
 	}
 	else