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Task Management
Task Stack
(RAM) (4)
Priority
(2)
Task Code
(1)
CPU_STK MyTaskStk[???]
void
MyTask (void *p_arg)
{
/* Local variables */
/* Task Initialization */
for (;;) {
Wait for event to occur;
Process event;
}
}
Variables
CPU
(RAM)
(5)
I/O
Registers
(3)
(Optional)
Device(s)
(6)
(Optional)
Figure 5-2 Tasks interact with resources
F5-2(1)
An important aspect of a task is its code. As previously mentioned, the code
looks like any other C function, except that it is typically implemented as an
infinite loop. Also, a task is not allowed to return.
F5-2(2)
Each task is assigned a priority based on its importance in the application.
μC/OS-III’s job is to decide which task will run on the CPU. The general rule is
that μC/OS-III will run the most important ready-to-run task (highest priority).
With μC/OS-III, a low priority number indicates a high priority. In other words,
a task at priority 1 is more important than a task at priority 10.
μC/OS-III supports a compile-time user configurable number of different
priorities (see OS_PRIO_MAX in OS_CFG.H ). Thus, μC/OS-III allows the user to
determine the number of different priority levels the application is allowed to
use. Also, μC/OS-III supports an unlimited number of tasks at the same priority.
For example, μC/OS-III can be configured to have 64 different priority levels
and one can assign dozens of tasks at each priority level.
See section 5-1 “Assigning Task Priorities” on page 84.
81
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