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Task Management
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Figure 5-7 μC/OS-III’s internal task state machine
F5-7(1)
State 0 occurs when a task is ready to run. Every task “wants” to be ready to
run as that is the only way it gets to perform their duties.
F5-7(2)
A task can decide to wait for time to expire by calling either OSTimeDly() or
OSTimeDlyHMSM() . When the time expires or the delay is cancelled (by calling
OSTimeDlyResume() ), the task returns to the ready state.
F5-7(3)
A task can wait for an event to occur by calling one of the pend (i.e., wait)
functions ( OSFlagPend() ,
OSMutexPend() ,
OSQPend() ,
OSSemPend() ,
OSTaskQPend() , or OSTaskSemPend() ), and specify to wait forever for the
event to occur. The pend terminates when the event occurs (i.e., a task or an
ISR performs a “post”), the awaited object is deleted or, another task decides to
abort the pend.
95
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