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Chapter 5
F5-7(4)
A task can wait for an event to occur as indicated, but specify that it is willing
to wait a certain amount of time for the event to occur. If the event is not
posted within that time, the task is readied, then the task is notified that a
timeout occurred. Again, the pend terminates when the event occurs (i.e., a
task or an ISR performs a “post”), the object awaited is deleted or, another task
decides to abort the pend.
F5-7(5)
A task can suspend itself or another task by calling OSTaskSuspend() . The
only way the task is allowed to resume execution is by calling
OSTaskResume() . Suspending a task means that a task will not be able to run
on the CPU until it is resumed by another task.
F5-7(6)
A delayed task can also be suspended by another task. In this case, the effect is
additive. In other words, the delay must complete (or be resumed by
OSTimeDlyResume() ) and the suspension must be removed (by another task
which would call OSTaskResume() ) in order for the task to be able to run.
F5-7(7)
F5-7(8)
A task waiting on an event to occur may be suspended by another task. Again,
the effect is additive. The event must occur and the suspension removed (by
another task) in order for the task to be able to run. Of course, if the object that
the task is pending on is deleted or, the pend is aborted by another task, then
one of the above two condition is removed. The suspension , however, must be
explicitly removed.
A task can wait for an event, but only for a certain amount of time, and the
task could also be suspended by another task. As one might expect, the
suspension must be removed by another task (or the same task that
suspended it in the first place), and the event needs to either occur or timeout
while waiting for the event.
96
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