--- rpl/src/instructions_a5.c	2013/04/05 13:07:20	1.47
+++ rpl/src/instructions_a5.c	2013/05/23 12:45:08	1.48
@@ -272,6 +272,12 @@ instruction_alarm(struct_processus *s_et
 
 				scrutation_injection(s_etat_processus);
 
+				if (pthread_mutex_lock(&((*s_etat_processus).mutex)) != 0)
+				{
+					(*s_etat_processus).erreur_systeme = d_es_processus;
+					return;
+				}
+
 				if ((*s_etat_processus).nombre_interruptions_non_affectees != 0)
 				{
 					affectation_interruptions_logicielles(s_etat_processus);
@@ -282,6 +288,12 @@ instruction_alarm(struct_processus *s_et
 					traitement_interruptions_logicielles(s_etat_processus);
 				}
 
+				if (pthread_mutex_unlock(&((*s_etat_processus).mutex)) != 0)
+				{
+					(*s_etat_processus).erreur_systeme = d_es_processus;
+					return;
+				}
+
 				gettimeofday(&fin_interruption, NULL);
 
 				if (fin_interruption.tv_usec < debut_interruption.tv_usec)