Rename microkernel/mail.h to mailbox.h

Now spells out the name of the associated microkernel object in full.

Change-Id: Iee532e9fbbcafbf9ba44c91de0894b7181285e8e
Signed-off-by: Allan Stephens <allan.stephens@windriver.com>

doc/object/object_microkernel.rst

@@ -201,7 +201,7 @@ Mailbox Objects
 Definition
 ==========
 
-A mailbox object is defined in include :file:`/microkernel/mail.h`.
+A mailbox object is defined in include :file:`/microkernel/mailbox.h`.
 Mailboxes are a flexible way to pass data and for tasks to exchange messages.
 
 Function

include/microkernel.h

@@ -45,7 +45,7 @@
 #include <microkernel/ticks.h>
 #include <microkernel/mmap.h>
 #include <microkernel/mutex.h>
-#include <microkernel/mail.h>
+#include <microkernel/mailbox.h>
 #include <microkernel/fifo.h>
 #include <microkernel/sema.h>
 #include <microkernel/event.h>

include/microkernel/mailbox.h

@@ -1,4 +1,4 @@
-/* microkernel/mail.h - microkernel mailbox header file */
+/* microkernel/mailbox.h - microkernel mailbox header file */
 
 /*
  * Copyright (c) 1997-2014 Wind River Systems, Inc.
@@ -30,8 +30,8 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef MAIL_H
-#define MAIL_H
+#ifndef _MAILBOX_H
+#define _MAILBOX_H
 
 /* externs */
 
@@ -88,4 +88,4 @@ extern int _task_mbox_data_get_async_block(struct k_msg *M,
 }
 #endif
 
-#endif /* MAIL_H */
+#endif /* _MAILBOX_H */