diff options
Diffstat (limited to 'src/include/mailboxes.h')
| -rw-r--r-- | src/include/mailboxes.h | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/src/include/mailboxes.h b/src/include/mailboxes.h index 03623e7bc..58e386e9f 100644 --- a/src/include/mailboxes.h +++ b/src/include/mailboxes.h @@ -52,22 +52,33 @@ extern "C" { #endif
/**
- * Verifies if the mailbox has space for an immediate message.
+ * Returns the mailbox buffer size.
+ * @param[in] mbp the pointer to an initialized Mailbox object
+ */
+#define chMBSize(mbp) \
+ ((mbp)->mb_top - (mbp)->mb_buffer)
+
+/**
+ * Returns the free space into the mailbox.
* @param[in] mbp the pointer to an initialized Mailbox object
* @return The number of empty message slots.
* @note Can be invoked in any system state but if invoked out of a locked
* state then the returned value may change after reading.
+ * @note The returned value can be less than zero when there are waiting
+ * threads on the internal semaphore.
*/
-#define chMBHasSpace(mbp) chSemGetCounterI(&(mbp)->mb_emptysem)
+#define chMBGetEmpty(mbp) chSemGetCounterI(&(mbp)->mb_emptysem)
/**
- * Verifies if the mailbox has incoming messages.
+ * Returns the number of messages into the mailbox.
* @param[in] mbp the pointer to an initialized Mailbox object
* @return The number of queued messages.
* @note Can be invoked in any system state but if invoked out of a locked
* state then the returned value may change after reading.
+ * @note The returned value can be less than zero when there are waiting
+ * threads on the internal semaphore.
*/
-#define chMBContainsMessages(mbp) chSemGetCounterI(&(mbp)->mb_fullsem)
+#define chMBGetFull(mbp) chSemGetCounterI(&(mbp)->mb_fullsem)
/**
* Returns the next message in the queue without removing it.
|