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Getting Started with μC/OS-III
L3-8(1)
Task #2 starts by waiting for messages to be sent through the message queue
AppQ. The task waits forever for a message to be received because the third
argument specifies an infinite timeout.
When the message is received p_msg will contain the message (i.e., a pointer
to “something”). Both the sender and receiver must agree as to the meaning
of the message. The size of the message received is saved in “ msg_size ”.
Note that “ p_msg ” could point to a buffer and “ msg_size ” would indicate the
size of this buffer.
Also, when the message is received, “ ts ” will contain the timestamp of when the
message was sent. A timestamp is the value read from a fairly fast free-running
timer. The timestamp is typically an unsigned 32-bit (or more) value.
L3-8(2)
Knowing when the message was sent allows the user to determine how long it
took this task to get the message. Reading the current timestamp and
subtracting the timestamp of when the message was sent allows users to know
how long it took for the message to be received. Note that the receiving task
may not get the message immediately since ISRs or other higher-priority tasks
might execute before the receiver gets to run.
L3-8(3)
Proceed with processing the received message.
67
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