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Task Management
the ASCII string to parse and what constitute tokens. As soon as the function finds the first
token, it returns. The function “remembers” where it was last so when called again, it can
extract additional tokens, which is clearly non-reentrant.
The use of an infinite loop is more common in embedded systems because of the repetitive
work needed in such systems (reading inputs, updating displays, performing control
operations, etc.). This is one aspect that makes a task different than a regular C function.
Note that one could use a “ while (1) ” or “ for (;;) ” to implement the infinite loop, since
both behave the same. The one used is simply a matter of personal preference. At Micrium,
we like to use “ while (DEF_ON) ”. The infinite loop must call a μC/OS-III service (i.e.,
function) that will cause the task to wait for an event to occur. It is important that each task
wait for an event to occur, otherwise the task would be a true infinite loop and there would
be no easy way for other tasks to execute. This concept will become clear as more is
understood regarding μC/OS-III.
void MyTask (void *p_arg)
{
/* Local variables
/* Do something with “p_arg”
/* Task initialization
while (DEF_ON) { /* Task body, as an infinite loop.
:
/* Task body ... do work!
:
/* Must call one of the following services:
/* OSFlagPend()
/* OSMutexPend()
/* OSPendMulti()
/* OSQPend()
/* OSSemPend()
/* OSTimeDly()
/* OSTimeDlyHMSM()
/* OSTaskQPend()
/* OSTaskSemPend()
/* OSTaskSuspend() (Suspend self)
/* OSTaskDel() (Delete self)
:
/* Task body ... do work!
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
:
}
}
Listing 5-2 Infinite Loop task
77
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