I myself found the names fork and spawn as used in jtask confusing and
contradicted to that in documentation for 2!:0 and 2!:1. The meaning or at
least the intention to use directly 2!:0 and 2!:1 is more clear.
There was discussion on this subject some years ago. Please search forum
archive if you are interested.
Вск, 08 Янв 2012, Marshall Lochbaum писал(а):
> In J701, fork_jtask_[load'task' accomplishes this. fork is defined as
> fork_jtask_ =: [: 2!:1 '(' , ')&' ,~ ]
>
> However, in J602 it is just an alias for 2!:1, so it's best to assign as
> above in Unix if both J602 and J701 will be used.
>
> Marshall
>
> On Sun, Jan 8, 2012 at 10:46 PM, bill lam <bbill....@gmail.com> wrote:
>
> > It is a feature of *nix shells that an ending "&" in the command line will
> > make the process forked. eg,
> >
> > 2!:1 '/Applications/TextEdit.app/Contents/MacOS/TextEdit &'
> >
> > Пнд, 09 Янв 2012, Ian Clark писал(а):
> > > I try:
> > >
> > > 2!:1 '/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome'
> > >
> > > Chome starts up... the J session freezes. It only unfreezes when I quit
> > Chrome.
> > >
> > > This happens with all apps I can launch from the UNIX command line. Eg:
> > >
> > > 2!:1 '/Applications/TextEdit.app/Contents/MacOS/TextEdit'
> > >
> > >
> > >
> > > On Mon, Jan 9, 2012 at 2:43 AM, bill lam <bbill....@gmail.com> wrote:
> > > > Try, eg,
> > > >
> > > > 2!:1 'firefox &'
> > > >
> > > > Пнд, 09 Янв 2012, Ian Clark писал(а):
> > > >> AFAICS the purpose of 2!:1 (spawn) is to launch an asynchronous
> > > >> process, eg a separate, parallel J session, and resume immediately it
> > > >> is launched. Am I right?
> > > >>
> > > >> On my Mac it doesn't do that. (I can't establish what it does under
> > > >> Windows because I don't have a Windows machine just now).
> > > >>
> > > >> Sure, it starts the specified process, but then the original J session
> > > >> freezes solid until the spawned process terminates. This behavior is
> > > >> no different from 2!:0 except to discard any returned value.
> > > >>
> > > >> Absence of this facility is preventing me from doing a lot of the
> > > >> things I want to. In particular I can't play a sound without my app
> > > >> hanging until the sound has finished playing. Nor can I write a server
> > > >> in J and have it fire off a client. I have to launch the client
> > > >> manually.
> > > >>
> > > >> Has nobody reported this behavior before? Any chance of getting it
> > > >> fixed? Anyone know a workaround (such as a dll/dylib call)?
> > > >>
> > > >> JVERSION
> > > >> Installer: j602a_mac_intel.dmg
> > > >> Engine: j602/2008-03-03/16:45
> > > >> Library: 6.02.057
> > > >>
> > > >> JVERSION
> > > >> Engine: j701/2011-01-10/11:25 build: Feb 6 2011 16:16:29
> > > >> Library: 7.01.052
> > > >> Platform: Darwin 64
> > > >> Installer: j701a_mac64.dmg
> > > >>
> > > >> InstallPath: /Applications/j64-701
> > > >> ----------------------------------------------------------------------
> > > >> For information about J forums see
> > http://www.jsoftware.com/forums.htm
> > > >
> > > > --
> > > > regards,
> > > > ====================================================
> > > > GPG key 1024D/4434BAB3 2008-08-24
> > > > gpg --keyserver subkeys.pgp.net --recv-keys 4434BAB3
> > > > ----------------------------------------------------------------------
> > > > For information about J forums see http://www.jsoftware.com/forums.htm
> > > ----------------------------------------------------------------------
> > > For information about J forums see http://www.jsoftware.com/forums.htm
> >
> > --
> > regards,
> > ====================================================
> > GPG key 1024D/4434BAB3 2008-08-24
> > gpg --keyserver subkeys.pgp.net --recv-keys 4434BAB3
> > ----------------------------------------------------------------------
> > For information about J forums see http://www.jsoftware.com/forums.htm
> >
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
--
regards,
====================================================
GPG key 1024D/4434BAB3 2008-08-24
gpg --keyserver subkeys.pgp.net --recv-keys 4434BAB3
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