monitors provide a way of locking.

@@ -64,9 +64,9 @@ extern int mailbox_size           __P ((mailbox_t, off_t *size));
 extern int mailbox_is_updated     __P ((mailbox_t));
 extern int mailbox_scan           __P ((mailbox_t, size_t no, size_t *count));
 
-/* Stream settings.  */
-extern int mailbox_get_stream     __P ((mailbox_t, stream_t *));
+/* Mailbox Stream.  */
 extern int mailbox_set_stream     __P ((mailbox_t, stream_t));
+extern int mailbox_get_stream     __P ((mailbox_t, stream_t *));
 
 /* Lock settings.  */
 extern int mailbox_get_locker     __P ((mailbox_t, locker_t *));

+/* GNU mailutils - a suite of utilities for electronic mail
+   Copyright (C) 1999, 2000 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Library Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#ifndef _MAILUTILS_MONITOR_H
+#define _MAILUTILS_MONITOR_H
+
+#include <sys/types.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef __P
+# ifdef __STDC__
+#  define __P(args) args
+# else
+#  define __P(args) ()
+# endif
+#endif /*__P */
+
+struct _monitor;
+typedef struct _monitor *monitor_t;
+
+extern int monitor_create      __P ((monitor_t *, void *owner));
+extern void monitor_destroy    __P ((monitor_t *, void *owner));
+extern void *monitor_get_owner __P ((monitor_t));
+
+extern int monitor_rdlock      __P ((monitor_t));
+extern int monitor_wrlock      __P ((monitor_t));
+extern int monitor_unlock      __P ((monitor_t));
+extern int monitor_wait        __P ((monitor_t));
+extern int monitor_notify      __P ((monitor_t));
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _MAILUTILS_MONITOR_H */

@@ -38,12 +38,13 @@ typedef struct _observer* observer_t;
 typedef struct _observable* observable_t;
 
 #define MU_EVT_MAILBOX_DESTROY   0x001
-#define MU_EVT_FOLDER_DESTROY   0x001
-#define MU_EVT_MAILER_DESTROY    0x002
-#define MU_EVT_MESSAGE_DESTROY   0x004
-#define MU_EVT_MESSAGE_ADD       0x008
-#define MU_EVT_MAILBOX_PROGRESS  0x010
-#define MU_EVT_AUTHORITY_FAILED  0x020
+#define MU_EVT_FOLDER_DESTROY    0x002
+#define MU_EVT_MAILER_DESTROY    0x004
+#define MU_EVT_MESSAGE_DESTROY   0x008
+#define MU_EVT_MESSAGE_ADD       0x010
+#define MU_EVT_MAILBOX_PROGRESS  0x020
+#define MU_EVT_AUTHORITY_FAILED  0x030
+#define MU_EVT_MAILBOX_CORRUPT   0x040
 
 #define MU_OBSERVER_NO_CHECK 1