Re: open/fork from a callback hang the windows (gtk2::helper)
On 15 January 2015 at 07:21, Prunk Dump prunkd...@gmail.com wrote: On all gtk2::helper examples I've found, the open call is made before Gtk2-main. How can I do if the windows is already displayed and if I'm inside gtkmain ? I use Glib::Timeout() to update the progress bar. I start the subprocess with IPC::Open3::open3(), and Glib::IO-add_watch() to monitor the output. You can see the gory details in https://sourceforge.net/p/gscan2pdf/code/ci/master/tree/lib/Gscan2pdf/Frontend/CLI.pm Search for _watch_cmd Regards Jeff ___ gtk-perl-list mailing list gtk-perl-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtk-perl-list
Re: open/fork from a callback hang the windows (gtk2::helper)
On Thu, Jan 15, 2015 at 9:21 AM, Prunk Dump prunkd...@gmail.com wrote:
But if I fork the command with open in a callback, the gtkmain
thread hangs until the command finish. I'm sure that the open call is
non-blocking.
sub my_callback {
my $fd = FileHandle-new()
open($fd, mycommand | ) or quitCallback(can't fork)
}
-- hang on return
I don't really understand why. Maybe Gtk make the callbacks with new
threads and wait the result with waitpid ?
No, threads aren't the answer here.
I'm guessing that your script hangs because you never read from the
opened filehandle in your callback, so mycommand never exits because
it's waiting for it's data to be read.
On all gtk2::helper examples I've found, the open call is made
before Gtk2-main. How can I do if the windows is already displayed
and if I'm inside gtkmain ?
There's an example in the Gtk-Perl FAQ that uses
Gtk2::Helper-add_watch after the GUI has been displayed;
https://wiki.gnome.org/Attic/GTK2-Perl/FrequentlyAskedQuestions#How_do_I_keep_my_GUI_updating_while_doing_a_long_file_read.3F
Instead of calling open() in the callback as in your code snippet, you
make the open() call by itself, assign the filehandle created by the
open() call to a $variable, then add a watch on that filehandle
$variable via Gtk2::Helper-add_watch/Glib::IO-add_watch.
Gtk2::Helper-add_watch is just a wrapper around Glib::IO-add_watch
anyways.
Jeffery also suggested previously using IPC::open3 and
Glib::IO-add_watch to accomplish the same thing.
The FAQ also has an example of using the threads module, if you're
really trying to use threads, but using open() and adding a watch to
the filehandle will do what I think you are asking for, with less
pain.
Thanks,
Brian
http://perldoc.perl.org/functions/open.html
http://perldoc.perl.org/perlipc.html#Using-open()-for-IPC
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Using Alien on Windows for Gtk-Perl module installation, was Re: Installing Glib::Object::Introspection
On Mon, Jan 12, 2015 at 3:15 PM, Ed . ej...@hotmail.com wrote: I have a vision of a Windows-compatible way of abstracting the finding of non-perl libraries, using Alien::*, probably using Alien::Base. This would mean there would be an Alien::Glib, etc, which on install would either find or build and install in perl's site library glib, and at runtime would dynaload it into perl. What are your thoughts? The first thing that comes to my mind is compilers. On Windows, it's not guaranteed that a compiler is installed; this is why Strawberry bundles a copy of MinGW with it's install, so it can compile Perl modules that have XS extensions. Also, the interaction of software compiled with different C compilers is not guaranteed, i.e. if you compile Perl with one compiler, and then compile XS modules with another, things may not work as you expect. This is true even on Unix systems; it's generally best to use the same compiler for everything that is meant to run together, like Perl and Perl modules that have XS code. In principle, I whole-heartedly support making things easier for end users. I'm not sure right now that Alien would do that, at least on Windows platforms, without more thought towards how to set up and/or guarantee a stable base to install Perl/Perl modules on top of. I'd love to be proved wrong with something that sets your build environment up on Windows (compilers, support binaries), and then does the grunt-work of installing things for you (Glib/Gtk2/Gtk3 and friends). Does this answer your question? Thanks, Brian ___ gtk-perl-list mailing list gtk-perl-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtk-perl-list
