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Change API of chopstx_setpriority

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NIIBE Yutaka
2016-07-01 09:51:32 +09:00
parent c7e571eca0
commit f5880ee5d5
4 changed files with 35 additions and 16 deletions
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39
chopstx.c
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@@ -1868,6 +1868,7 @@ chopstx_poll (uint32_t *usec_p, int n, struct chx_poll_head *pd_array[])
* @prio: priority
*
* Change the schedule priority with @prio.
* Returns the old priority.
*
* In general, it is not recommended to use this function because
* dynamically changing schedule priorities complicates the system.
@@ -1875,25 +1876,33 @@ chopstx_poll (uint32_t *usec_p, int n, struct chx_poll_head *pd_array[])
* which starts its execution with priority of CHX_PRIO_MAIN_INIT, and
* let it change its priority after initialization of other threads.
*/
void
chopstx_setpriority (chopstx_prio_t prio)
chopstx_prio_t
chopstx_setpriority (chopstx_prio_t prio_new)
{
struct chx_thread *tp = running;
chopstx_prio_t prio_orig, prio_cur;
if (tp->prio < CHOPSTX_PRIO_INHIBIT_PREEMPTION
&& prio >= CHOPSTX_PRIO_INHIBIT_PREEMPTION)
{
chx_cpu_sched_lock ();
tp->prio = tp->prio_orig = prio;
}
else if (tp->prio >= CHOPSTX_PRIO_INHIBIT_PREEMPTION
&& prio < CHOPSTX_PRIO_INHIBIT_PREEMPTION)
{
tp->prio = tp->prio_orig = prio;
chx_cpu_sched_unlock ();
}
chx_cpu_sched_lock ();
prio_orig = tp->prio_orig;
prio_cur = tp->prio;
tp->prio_orig = prio_new;
if (prio_cur == prio_orig)
/* No priority inheritance is active. */
tp->prio = prio_new;
else
tp->prio = tp->prio_orig = prio;
/* Priority inheritance is active. */
/* In this case, only when new priority is greater, change the
priority of this thread. */
if (prio_new > prio_cur)
tp->prio = prio_new;
if (tp->prio < prio_cur)
chx_sched (CHX_YIELD);
else if (tp->prio < CHOPSTX_PRIO_INHIBIT_PREEMPTION)
chx_cpu_sched_unlock ();
return prio_orig;
}
/*