receive
Extract message from queue
Syntax
Description
receive( extracts an input
or local message from its receiving queue. If a valid message exists,
message_name)receive returns true. If a valid message
does not exist but there is a message in the queue, the chart removes the message
from the queue and receive returns true. If a
valid message does not exist and there are no messages in the queue,
receive returns false.
Examples
Extract Message in State Action
Check the queue for message M and increment the value
of x if both of these conditions are true:
A message is present in the queue.
The data value of the message is equal to 3.
If a message is not present or if the data value is not equal
to 3, then the value of x does not change. If a message
is present, remove it from the queue regardless of the data value.
during: if receive(M) && M.data == 3 x = x+1; end
