ClabureDB: Classified Bug-Reports Database

/**
 * yield - yield the current processor to other threads.
 *
 * This is a shortcut for kernel-space yielding - it marks the
 * thread runnable and calls sys_sched_yield().
 */
void __sched yield(void)
{
        set_current_state(TASK_RUNNING);
        sys_sched_yield();
}
EXPORT_SYMBOL(yield);

/*
 * This task is about to go to sleep on IO. Increment rq->nr_iowait so
 * that process accounting knows that this is a task in IO wait state.
 *
 * But don't do that if it is a deliberate, throttling IO wait (this task
 * has set its backing_dev_info: the queue against which it should throttle)
 */
void __sched io_schedule(void)
{
        struct rq *rq = &__raw_get_cpu_var(runqueues);

        delayacct_blkio_start();
        atomic_inc(&rq->nr_iowait);
        schedule();
        atomic_dec(&rq->nr_iowait);
        delayacct_blkio_end();
}
EXPORT_SYMBOL(io_schedule);

long __sched io_schedule_timeout(long timeout)
{
        struct rq *rq = &__raw_get_cpu_var(runqueues);
        long ret;

        delayacct_blkio_start();
        atomic_inc(&rq->nr_iowait);
        ret = schedule_timeout(timeout);