--- rpl/src/instructions_d5.c	2016/03/01 22:12:30	1.138
+++ rpl/src/instructions_d5.c	2016/03/09 10:57:41	1.139
@@ -1109,7 +1109,11 @@ instruction_detach(struct_processus *s_e
 
 	verrouillage_threads_concurrents(s_etat_processus);
 	(*s_argument_thread).pid = fork();
-	deverrouillage_threads_concurrents(s_etat_processus);
+
+	if ((*s_argument_thread).pid > 0)
+	{
+		deverrouillage_threads_concurrents(s_etat_processus);
+	}
 
 	if (pthread_mutex_unlock(&((*s_etat_processus).mutex_allocation_buffer))
 			!= 0)