act_tsk

iact_tsk

Outline

Activate task (queues an activation request).

C format

 ER      act_tsk (ID tskid);

 ER      iact_tsk (ID tskid);

Parameter(s)

I/O	Parameter	Description
I	ID tskid;	ID number of the task to be activated. TSK_SELF: Invoking task. Value: ID number of the task to be activated.

Explanation

These service calls move a task specified by parameter tskid from the DORMANT state to the READY state.

As a result, the target task is queued at the end on the ready queue corresponding to the initial priority and becomes subject to scheduling by the RI850V4.

If the target task has been moved to a state other than the DORMANT state when this service call is issued, this service call does not move the state but increments the activation request counter (by added 0x1 to the wakeup request counter).

Note 1 The activation request counter managed by the RI850V4 is configured in 7-bit widths. If the number of activation requests exceeds the maximum count value 127 as a result of issuing this service call, the counter manipulation processing is therefore not performed but "E_QOVR" is returned.

Note 2 Extended information specified in Task information is passed to the task activated by issuing these service calls.

Return value

Macro	Value	Description
E_OK	0	Normal completion.
E_ID	-18	Invalid ID number. - tskid < 0x0 - tskid > Maximum ID number - When this service call was issued from a non-task, TSK_SELF was specified tskid.
E_CTX	-25	Context error. - This service call was issued in the CPU locked state.
E_NOEXS	-42	Non-existent object. - Specified task is not registered.
E_QOVR	-43	Queue overflow. - Activation request count exceeded 127.