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Re: javax.swing.Timer blocking program termination

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From Martin Gregorie <martin@address-in-sig.invalid>
Newsgroups comp.lang.java.programmer
Subject Re: javax.swing.Timer blocking program termination
Date Wed, 15 Jul 2015 01:16:09 +0000 (UTC)
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On Tue, 14 Jul 2015 15:08:11 -0700, Knute Johnson wrote:

> That's one of the issues, the timer doesn't run on the EDT, it just
> schedules its work on the EDT.
>
Yes, I saw that from Jeff's dumps.
 
> "Although all Timers perform their waiting using a single, shared thread
> (created by the first Timer object that executes), the action event
> handlers for Timers execute on another thread -- the event-dispatching
> thread."
>
OK.
 
> It's not clear to me what "executes" is either, does that mean start()
> is called on a timer or a timer has reached the initial delay and called
> one of the event handlers?
>
'execute' could well mean that there's a single ticker loop that 
increments the counters in all running Timers. That would be fairly 
efficient with them all on the same thread. And with intervals specified 
in mS, there should typically be plenty of time within a tick to run the 
two threads (timer and action) one after the other, so there shouldn't be 
any locking or synchronising clashes between them. [*]

[*] However, the timer interval can be specified as < 1 mS, i.e. as fast 
as possible, so synchronization would be needed to handle that case, but 
even so it probably adds very little overhead in the general case where 
the timer interval is >= 1 and so the two sewquential thread invocations 
have completed before the tick interval expires.
  

-- 
martin@   | Martin Gregorie
gregorie. | Essex, UK
org       |

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javax.swing.Timer blocking program termination Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2015-07-13 16:03 -0700
  Re: javax.swing.Timer blocking program termination Jeff Higgins <jeff@invalid.invalid> - 2015-07-13 20:27 -0400
    Re: javax.swing.Timer blocking program termination Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2015-07-13 17:46 -0700
      Re: javax.swing.Timer blocking program termination Jeff Higgins <jeff@invalid.invalid> - 2015-07-13 21:35 -0400
        Re: javax.swing.Timer blocking program termination Jeff Higgins <jeff@invalid.invalid> - 2015-07-13 22:13 -0400
          Re: javax.swing.Timer blocking program termination Jeff Higgins <jeff@invalid.invalid> - 2015-07-13 22:27 -0400
          Re: javax.swing.Timer blocking program termination e.d.programmer@gmail.com - 2015-07-14 06:31 -0700
            Re: javax.swing.Timer blocking program termination Jeff Higgins <jeff@invalid.invalid> - 2015-07-14 10:15 -0400
              Re: javax.swing.Timer blocking program termination Jeff Higgins <jeff@invalid.invalid> - 2015-07-14 10:22 -0400
              Re: javax.swing.Timer blocking program termination e.d.programmer@gmail.com - 2015-07-14 07:39 -0700
                Re: javax.swing.Timer blocking program termination Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-07-14 10:53 -0400
                Re: javax.swing.Timer blocking program termination e.d.programmer@gmail.com - 2015-07-14 10:16 -0700
                Re: javax.swing.Timer blocking program termination Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-07-14 13:25 -0400
                Re: javax.swing.Timer blocking program termination e.d.programmer@gmail.com - 2015-07-14 10:45 -0700
                Re: javax.swing.Timer blocking program termination Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-07-14 14:16 -0400
                Re: javax.swing.Timer blocking program termination Gene Wirchenko <genew@telus.net> - 2015-07-14 12:56 -0700
                Re: javax.swing.Timer blocking program termination Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-07-14 16:14 -0400
                Re: javax.swing.Timer blocking program termination e.d.programmer@gmail.com - 2015-07-15 05:11 -0700
                Re: javax.swing.Timer blocking program termination Jeff Higgins <jeff@invalid.invalid> - 2015-07-15 08:33 -0400
                Re: javax.swing.Timer blocking program termination Martin Gregorie <martin@address-in-sig.invalid> - 2015-07-15 18:46 +0000
                Re: javax.swing.Timer blocking program termination Jeff Higgins <jeff@invalid.invalid> - 2015-07-15 21:18 -0400
                Re: javax.swing.Timer blocking program termination Jeff Higgins <jeff@invalid.invalid> - 2015-07-15 22:13 -0400
                Re: javax.swing.Timer blocking program termination Jeff Higgins <jeff@invalid.invalid> - 2015-07-14 10:55 -0400
                Re: javax.swing.Timer blocking program termination Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2015-07-14 08:17 -0700
                Re: javax.swing.Timer blocking program termination Jeff Higgins <jeff@invalid.invalid> - 2015-07-14 11:42 -0400
                Re: javax.swing.Timer blocking program termination Martin Gregorie <martin@address-in-sig.invalid> - 2015-07-14 18:35 +0000
                Re: javax.swing.Timer blocking program termination Jeff Higgins <jeff@invalid.invalid> - 2015-07-14 15:17 -0400
                Re: javax.swing.Timer blocking program termination Jeff Higgins <jeff@invalid.invalid> - 2015-07-14 15:36 -0400
                Re: javax.swing.Timer blocking program termination Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-07-14 15:51 -0400
                Re: javax.swing.Timer blocking program termination Martin Gregorie <martin@address-in-sig.invalid> - 2015-07-14 21:51 +0000
                Re: javax.swing.Timer blocking program termination Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2015-07-14 15:08 -0700
                Re: javax.swing.Timer blocking program termination Martin Gregorie <martin@address-in-sig.invalid> - 2015-07-15 01:16 +0000
                Re: javax.swing.Timer blocking program termination Jeff Higgins <jeff@invalid.invalid> - 2015-07-14 16:09 -0400
                Re: javax.swing.Timer blocking program termination Jeff Higgins <jeff@invalid.invalid> - 2015-07-14 18:32 -0400
                Re: javax.swing.Timer blocking program termination Jeff Higgins <jeff@invalid.invalid> - 2015-07-14 18:34 -0400
                Re: javax.swing.Timer blocking program termination Jeff Higgins <jeff@invalid.invalid> - 2015-07-14 20:31 -0400
                Re: javax.swing.Timer blocking program termination Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2015-07-14 08:16 -0700
  Re: javax.swing.Timer blocking program termination Joerg Meier <joergmmeier@arcor.de> - 2015-07-14 08:32 +0200
  Re: javax.swing.Timer blocking program termination Jeff Higgins <jeff@invalid.invalid> - 2015-07-14 22:18 -0400
  Re: javax.swing.Timer blocking program termination Jeff Higgins <jeff@invalid.invalid> - 2015-07-15 08:26 -0400
    Re: javax.swing.Timer blocking program termination Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2015-07-15 11:05 -0700

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