length

Determine length of message queue

Syntax

length(message_name)

Description

length(message_name) checks the number of messages in the internal receiving queue of an input or local message.

Examples

Check Queue Length in State Action

Check the queue for message M. If a message is present, remove it from the queue. If exactly seven messages remain in the queue, increment the value of x.

during:
   if receive(M) == true
      if length(M) == 7
         x = x+1;
      end
   end

Tips

• The length operator is not supported for input messages that use external receiving queues. To use the length operator, enable the Use Internal Queue property for this message.