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From: Martin Gainty <mgainty@hotmail.com>
To: <user@commons.apache.org>
Subject: RE: Commons daemon - stop the service
Date: Thu, 7 Jun 2012 18:08:13 -0400
Importance: Normal
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a quick scan of the source gives us some cluesif  PID is not there procrun =
exits with a -1fd =3D open(args->pidf=2C O_RDONLY=2C 0)=3B
    if (!quiet)
        log_debug("get_pidf: %d in %s"=2C fd=2C args->pidf)=3B
    if (fd < 0) {
        /* something has gone wrong the JVM has stopped */
        return -1=3B
    } later on with wait_child we check again if PID is not alive in which =
case a 1 is returned  /* check if the pid file process exists */
        fd =3D open(args->pidf=2C O_RDONLY)=3B
        if (fd < 0 && havejvm) {
            /* something has gone wrong the JVM has stopped */
            return 1=3B
        }else{ ...return 0=3B /* ready JVM started ..0 is returned to inter=
nal functions*/} /*if procrun returns 0 internally you're JVM is started*/ =
 /*.. the chronology for procrun denoument..*/ stop_child() while (count > =
0) {
            sleep(1)=3B
            pid =3D get_pidf(args=2C true)=3B
            if (pid <=3D 0) {
                /* JVM has stopped... the pid is non-existent*/
                return 0=3B
            }
            count--=3B
        }
        signal(SIGTERM=2C controller)=3B
        signal(SIGINT=2C controller)=3B        while (waitpid(pid=2C &statu=
s=2C 0) !=3D pid) {
            /* Waith for process */
        }        /* The child must have exited cleanly */
        if (WIFEXITED(status)) {
            status =3D WEXITSTATUS(status)=3B            /* Delete the pid =
file */
            if (args->vers !=3D true && args->chck !=3D true && status !=3D=
 122)
                unlink(args->pidf)=3B            /* If the child got out wi=
th 123 he wants to be restarted */
            /* See java_abort123 (we use this return code to restart when t=
he JVM aborts) */
            if (status =3D=3D 123) {
                log_debug("Reloading service")=3B
                /* prevent looping */
                if (laststart + 60 > time(NULL)) {
                    log_debug("Waiting 60 s to prevent looping")=3B
                    sleep(60)=3B
                }
                continue=3B
            }
            /* If the child got out with 0 he is shutting down */
            if (status =3D=3D 0) {
                log_debug("Service shut down")=3B
                return 0=3B
            }    remove_tmp_file(args)=3B
    log_debug("Shutdown or reload requested: exiting")=3B    /* Stop the se=
rvice */
    if (java_stop() !=3D true)
        return 6=3B  /*cannot stop java*/
    if (doreload =3D=3D true)
        ret =3D 123=3B
    else
        ret =3D 0=3B    /* Destroy the service */
    java_destroy()=3B    /* Destroy the Java VM */
    if (JVM_destroy(ret) !=3D true)
        return 7=3B

 yes if all goes well the JVM should be destroyed
Martin Gainty=20
______________________________________________=20
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 > From: James.Wang@infor.com
> To: user@commons.apache.org
> Subject: RE: Commons daemon - stop the service
> Date: Thu=2C 7 Jun 2012 18:06:03 +0000
>=20
> I have played with procrun a bit more and realized that SCM waits for at =
most two minutes. After that=2C it shows a message saying it got no respons=
e from the process and displays "stopping" as status on the service. But wh=
en the process finally ends=2C it shows "stopped" status (you have to manua=
lly refresh the SCM).=20
> Procrun has a parameter "StopTimeout"=2C which "Defines the timeout in se=
conds that procrun waits for service to exit gracefully."  What happens aft=
er the timeout period? Does procrun shut down the JVM?
> Thanks.
>=20
> James
>=20
> -----Original Message-----
> From: Mladen Turk [mailto:mturk@apache.org]=20
> Sent: Thursday=2C May 31=2C 2012 2:16 PM
> To: user@commons.apache.org
> Subject: Re: Commons daemon - stop the service
>=20
> On 05/31/2012 07:53 PM=2C James Wang wrote:
> > Thanks for the comments.
> > I set both start mode and stop mode to JVM.
>=20
> OK.
>=20
> > What will happen when a thread needs 20 more minutes to complete its jo=
b?
>=20
> Well for something like that procrun is not the toolkit to use.
> First of all=2C if you need to frequently start/stop service why using th=
e service at the first place?
> The sole purpose of service concept is to start the application at boot m=
ode or on demand and to start them in correct order.
>=20
> Then there is absolute limit which OS imposes on the service shutdown tim=
eout=2C and this is for all services on the system=2C see http://support.mi=
crosoft.com/kb/Q146092
>=20
> So the only clean solution is that your shutdown code does the actual cle=
anup causing the clean exit.
>=20
> By spec=2C JVM won't exit if you have non-daemon threads running=2C so if=
 you cant make them exit=2C then the only solution is System.exit=2C which =
calls OS process _exit() which causes the SCM to think service failed.
>=20
> Also you should design your application differently for service and comma=
nd line mode.
>=20
> Procrun does not need to call the main() method.
> Take a look at Tomcat. We call Bootstrap start/stop methods and main() ca=
lls Bootstrap.start (after setting correct mode)
>=20
>=20
>=20
> Regards
> --
> ^TM
>=20
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