/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 *
 * This D script is used as an example in the Solaris Dynamic Tracing Guide
 * wiki in the "sched Provider" Chapter.
 *
 * The full text of the this chapter may be found here:
 *
 *   http://docs.oracle.com/cd/E36784_01/html/E36846/sched-provider.html
 *
 * On machines that have DTrace installed, this script is available as
 * qtime.d in /usr/demo/dtrace, a directory that contains all D scripts
 * used in the Solaris Dynamic Tracing Guide.  A table of the scripts and their
 * corresponding chapters may be found here:
 *
 *   file:///usr/demo/dtrace/index.html
 */

sched:::enqueue
{
	ts[args[0]->pr_lwpid, args[1]->pr_pid, args[2]->cpu_id] =
	    timestamp;
}

sched:::dequeue
/ts[args[0]->pr_lwpid, args[1]->pr_pid, args[2]->cpu_id]/
{
	@[args[2]->cpu_id] = quantize(timestamp -
	    ts[args[0]->pr_lwpid, args[1]->pr_pid, args[2]->cpu_id]);
	ts[args[0]->pr_lwpid, args[1]->pr_pid, args[2]->cpu_id] = 0;
}