Comtrol eCos User Manual

Page 98

Kernel Real-time Characterization

Peek [empty] mbox

This test measures the

cyg_mbox_peek()

call. An attempt is made to peek the value in each mailbox, which

is currently empty. The purpose of this test is to measure the cost of checking a mailbox for a value without
blocking.

Put [first] mbox

This test measures the

cyg_mbox_put()

call. One item is added to a currently empty mailbox. The purpose

of this test is to measure the cost of adding an item to a mailbox. There are no other threads currently waiting
for mailbox items to arrive.

Peek [1 msg] mbox

This test measures the

cyg_mbox_peek()

call. An attempt is made to peek the value in each mailbox, which

contains a single item. The purpose of this test is to measure the cost of checking a mailbox which has data to
deliver.

Put [second] mbox

This test measures the

cyg_mbox_put()

call. A second item is added to a mailbox. The purpose of this test

is to measure the cost of adding an additional item to a mailbox. There are no other threads currently waiting
for mailbox items to arrive.

Peek [2 msgs] mbox

This test measures the

cyg_mbox_peek()

call. An attempt is made to peek the value in each mailbox, which

contains two items. The purpose of this test is to measure the cost of checking a mailbox which has data to
deliver.

Get [first] mbox

This test measures the

cyg_mbox_get()

call. The first item is removed from a mailbox that currently contains

two items. The purpose of this test is to measure the cost of obtaining an item from a mailbox without blocking.

Get [second] mbox

This test measures the

cyg_mbox_get()

call. The last item is removed from a mailbox that currently contains

one item. The purpose of this test is to measure the cost of obtaining an item from a mailbox without blocking.

Tryput [first] mbox

This test measures the

cyg_mbox_tryput()

call. A single item is added to a currently empty mailbox. The

purpose of this test is to measure the cost of adding an item to a mailbox.

Peek item [non-empty] mbox

This test measures the

cyg_mbox_peek_item()

call. A single item is fetched from a mailbox that contains a

single item. The purpose of this test is to measure the cost of obtaining an item without disturbing the mailbox.

Tryget [non-empty] mbox

This test measures the

cyg_mbox_tryget()

call. A single item is removed from a mailbox that contains

exactly one item. The purpose of this test is to measure the cost of obtaining one item from a non-empty
mailbox.