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Getting Started with μC/OS-III
L3-5(1)
Creating a mutex is simply a matter of calling OSMutexCreate() . Specify the
address of the OS_MUTEX object that will be used for the mutex. Chapter 13,
“Resource Management” on page 209 provides additional information about
mutual exclusion semaphores.
You can assign an ASCII name to the mutex, which is useful when debugging.
L3-5(2)
Create the message queue by calling OSQCreate() and specifying the address
of the OS_Q object. Chapter 15, “Message Passing” on page 289 provides
additional information about message queues.
Assign an ASCII name to the message queue.
Specify how many messages the message queue is allowed to receive. This
value must be greater than zero. If the sender sends messages faster than they
can be consumed by the receiving task, messages will be lost. This can be
corrected by either increasing the size of the message queue, or increasing the
priority of the receiving task.
L3-5(3)
The first application task is created.
Listing 3-6 shows how to create other tasks once multitasking as started.
63
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