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Task Management
F5-6(1)
The Dormant state corresponds to a task that resides in memory but has not
been made available to μC/OS-III.
A task is made available to μC/OS-III by calling a function to create the task,
OSTaskCreate() . The task code actually resides in code space but μC/OS-III
needs to be informed about it.
When it is no longer necessary for μC/OS-III to manage a task, call the task
delete function, OSTaskDel() . OSTaskDel() does not actually delete the code
of the task, it is simply not eligible to access the CPU.
F5-6(2)
The Ready state corresponds to a ready-to-run task, but is not the most
important task ready. There can be any number of tasks ready and μC/OS-III
keeps track of all ready tasks in a ready list (discussed later). This list is
sorted by priority.
F5-6(3)
The most important ready-to-run task is placed in the Running state. On a
single CPU, only one task can be running at any given time.
The task selected to run on the CPU is switched in by μC/OS-III from the ready
state when the application code calls OSStart() , or when μC/OS-III calls
either OSIntExit() or OS_TASK_SW() .
As previously discussed, tasks must wait for an event to occur. A task waits for
an event by calling one of the functions that brings the task to the pending
state if the event has not occurred.
F5-6(4)
Tasks in the Pending state are placed in a special list called a pend-list (or wait
list) associated with the event the task is waiting for. When waiting for the
event to occur, the task does not consume CPU time. When the event occurs,
the task is placed back into the ready list and μC/OS-III decides whether the
newly readied task is the most important ready-to-run task. If this is the case,
the currently running task will be preempted (placed back in the ready list) and
the newly readied task is given control of the CPU. In other words, the newly
readied task will run immediately if it is the most important task.
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