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/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsISupports.idl"

/**
 * Simple stopwatch mechanism for determining the amount of wall-clock time and
 * CPU time (user + system) that has elapsed.  It is not fancy.  It is either
 * running or it is not.  If you want coherent cpu and real time values, then
 * you had better stop it first.  It does not keep counting when stopped,
 * although one could add a resumeRetroactive or something to accomplish that.
 */
[scriptable, uuid(7a671d6e-d48f-4a4f-b87e-644815a5e381)]
interface nsIStopwatch : nsISupports {
  /**
   * Start the stopwatch; all counters are reset to zero.  If you want to
   * keep the already accumulated values, use resume instead.
   */
  void start();

  /**
   * Stop the stopwatch.
   */
  void stop();

  /**
   * Resume the stopwatch without clearing the existing counters.  Any time
   * already accumulated on cpuTime/realTime will be kept.
   */
  void resume();

  /**
   * The total CPU time (user + system) in seconds accumulated between calls to
   * start/resume and stop.  You have to stop the stopwatch to cause this value
   * to update.
   */
  readonly attribute double cpuTimeSeconds;
  /**
   * The total wall clock time in seconds accumulated between calls to
   * start/resume and stop.  You have to stop the stopwatch to cause this value
   * to update.
   */
  readonly attribute double realTimeSeconds;
};