void up_unblock_task(FAR _TCB *tcb)
{
/* Verify that the context switch can be performed */
if ((tcb->task_state < FIRST_BLOCKED_STATE) ||
(tcb->task_state > LAST_BLOCKED_STATE))
{
PANIC(OSERR_BADUNBLOCKSTATE);
}
else
{
FAR _TCB *rtcb = (FAR _TCB*)g_readytorun.head;
dbg("Unblocking TCB=%p\n", tcb);
/* Remove the task from the blocked task list */
sched_removeblocked(tcb);
/* Reset its timeslice. This is only meaningful for round
* robin tasks but it doesn't here to do it for everything
*/
#if CONFIG_RR_INTERVAL > 0
tcb->timeslice = CONFIG_RR_INTERVAL / MSEC_PER_TICK;
#endif
/* Add the task in the correct location in the prioritized
* g_readytorun task list
*/
if (sched_addreadytorun(tcb))
{
/* The currently active task has changed! We need to do
* a context switch to the new task.
*
* Are we in an interrupt handler?
*/
if (g_irqtos)
{
/* Yes, then we have to do things differently.
* Just copy the current stack into the OLD rtcb.
*/
up_saveirqcontext(&rtcb->xcp);
/* Restore the exception context of the rtcb at the (new) head
* of the g_readytorun task list.
*/
rtcb = (FAR _TCB*)g_readytorun.head;
dbg("New Active Task TCB=%p\n", rtcb);
/* Then setup so that the context will be performed on exit
* from the interrupt.
*/
g_irqcontext = &rtcb->xcp;
}
/* We are not in an interrupt andler. Copy the user C context
* into the TCB of the task that was previously active. if
* up_savecontext returns a non-zero value, then this is really the
* previously running task restarting!
*/
else if (!up_savecontext(&rtcb->xcp))
{
/* Restore the exception context of the new task that is ready to
* run (probably tcb). This is the new rtcb at the head of the
* g_readytorun task list.
*/
rtcb = (FAR _TCB*)g_readytorun.head;
dbg("New Active Task TCB=%p\n", rtcb);
/* Then switch contexts */
up_restorecontext(&rtcb->xcp);
}
}
}
}
void up_block_task(FAR struct tcb_s *tcb, tstate_t task_state)
{
FAR struct tcb_s *rtcb = (FAR struct tcb_s*)g_readytorun.head;
bool switch_needed;
/* Verify that the context switch can be performed */
ASSERT((tcb->task_state >= FIRST_READY_TO_RUN_STATE) &&
(tcb->task_state <= LAST_READY_TO_RUN_STATE));
dbg("Blocking TCB=%p\n", tcb);
/* Remove the tcb task from the ready-to-run list. If we
* are blocking the task at the head of the task list (the
* most likely case), then a context switch to the next
* ready-to-run task is needed. In this case, it should
* also be true that rtcb == tcb.
*/
switch_needed = sched_removereadytorun(tcb);
/* Add the task to the specified blocked task list */
sched_addblocked(tcb, (tstate_t)task_state);
/* If there are any pending tasks, then add them to the g_readytorun
* task list now
*/
if (g_pendingtasks.head)
{
switch_needed |= sched_mergepending();
}
/* Now, perform the context switch if one is needed */
if (switch_needed)
{
/* Are we in an interrupt handler? */
if (g_irqtos)
{
/* Yes, then we have to do things differently.
* Just copy the current registers into the OLD rtcb.
*/
up_saveirqcontext(&tcb->xcp);
/* Restore the exception context of the rtcb at the (new) head
* of the g_readytorun task list.
*/
rtcb = (FAR struct tcb_s*)g_readytorun.head;
dbg("New Active Task TCB=%p\n", rtcb);
/* Then setup so that the context will be performed on exit
* from the interrupt.
*/
g_irqcontext = &rtcb->xcp;
}
/* Copy the user C context into the TCB at the (old) head of the
* g_readytorun Task list. if up_savecontext returns a non-zero
* value, then this is really the previously running task restarting!
*/
else if (!up_savecontext(&rtcb->xcp))
{
/* Restore the exception context of the rtcb at the (new) head
* of the g_readytorun task list.
*/
rtcb = (FAR struct tcb_s*)g_readytorun.head;
dbg("New Active Task TCB=%p\n", rtcb);
/* Then switch contexts */
up_restorecontext(&rtcb->xcp);
}
}
}
