litmus/jobs.c


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/* litmus/jobs.c - common job control code
 */

#include <linux/sched.h>

#include <litmus/litmus.h>
#include <litmus/jobs.h>

static inline void setup_release(struct task_struct *t, lt_t release)
{
	/* prepare next release */
	t->rt_param.job_params.release = release;
	t->rt_param.job_params.deadline = release + get_rt_relative_deadline(t);
	t->rt_param.job_params.exec_time = 0;

	/* kludge - TODO: Move this to budget.h/.c */
	if (t->rt_param.budget.ops)
		bt_flags_reset(t);

	/* update job sequence number */
	t->rt_param.job_params.job_no++;

	/* don't confuse Linux */
	t->rt.time_slice = 1;

	TRACE_TASK(t, "preparing for next job: %d\n", t->rt_param.job_params.job_no);
}

void prepare_for_next_period(struct task_struct *t)
{
	BUG_ON(!t);

	/* Record lateness before we set up the next job's
	 * release and deadline. Lateness may be negative.
	 */
	t->rt_param.job_params.lateness =
		(long long)litmus_clock() -
		(long long)t->rt_param.job_params.deadline;

	setup_release(t, get_release(t) + get_rt_period(t));
}

void release_at(struct task_struct *t, lt_t start)
{
	BUG_ON(!t);
	setup_release(t, start);
	t->rt_param.completed = 0;
}


/*
 *	Deactivate current task until the beginning of the next period.
 */
long complete_job(void)
{
	/* Mark that we do not excute anymore */
	tsk_rt(current)->completed = 1;
	/* call schedule, this will return when a new job arrives
	 * it also takes care of preparing for the next release
	 */
	schedule();
	return 0;
}