RTEMS C User's Guide
In general, an option is built by a bitwise OR of the
desired option components. The set of valid options for the
rtems_message_queue_receive directive are
listed in the following table:
RTEMS_WAIT - task will wait for a message (default)
RTEMS_NO_WAIT - task should not wait
An option listed as a default is not required to
appear in the option OR list, although it is a good programming
practice to specify default options. If all defaults are
desired, the option RTEMS_DEFAULT_OPTIONS should
be specified on this call.
This example demonstrates the option parameter needed
to poll for a message to arrive. The option parameter passed to
the rtems_message_queue_receive directive should
be RTEMS_NO_WAIT.
RTEMS C User's Guide
Copyright © 1988-1998 OAR Corporation