--- rpl/src/instructions_s1.c	2016/03/01 22:12:34	1.81
+++ rpl/src/instructions_s1.c	2016/03/09 10:57:41	1.82
@@ -3690,7 +3690,11 @@ instruction_syseval(struct_processus *s_
 
 		verrouillage_threads_concurrents(s_etat_processus);
 		pid = fork();
-		deverrouillage_threads_concurrents(s_etat_processus);
+
+		if (pid > 0)
+		{
+			deverrouillage_threads_concurrents(s_etat_processus);
+		}
 
 		if (pid < 0)
 		{