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Getting Started with μC/OS-III
L3-4(1)
Allocate storage for the OS_TCB s of each task.
L3-4(2)
A mutual exclusion semaphore (a.k.a. a mutex) is a kernel object (a data
structure) that is used to protect a shared resource from being accessed by
more than one task. A task that wants to access the shared resource must
obtain the mutex before it is allowed to proceed. The owner of the resource
relinquishes the mutex when it has finished accessing the resource. This
process is demonstrated in this example.
L3-4(3)
A message queue is a kernel object through which Interrupt Service Routines
(ISRs) and/or tasks send messages to other tasks. The sender “formulates” a
message and sends it to the message queue. The task(s) wanting to receive
these messages wait on the message queue for messages to arrive. If there are
already messages in the message queue, the receiver immediately retrieves
those messages. If there are no messages waiting in the message queue, then
the receiver will be placed in a wait list associated with the message queue.
This process will be demonstrated in this example.
L3-4(4)
Allocate a stack for each task.
L3-4(5)
The user must prototype the tasks.
Listing 3-5 shows the entry point for C, main() .
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