From f747336ecc953fd9f0339e74fd1e245bc6278b06 Mon Sep 17 00:00:00 2001
From: dakkar <dakkar@sardina.(none)>
Date: Wed, 5 Aug 2009 15:34:52 +0200
Subject: first draft

---
 Queue.pm | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 thr.pl   | 47 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 112 insertions(+)
 create mode 100644 Queue.pm
 create mode 100644 thr.pl

diff --git a/Queue.pm b/Queue.pm
new file mode 100644
index 0000000..bf83a0d
--- /dev/null
+++ b/Queue.pm
@@ -0,0 +1,65 @@
+package Glib::Thread::Queue;
+use Moose;
+use Glib;
+use Thread::Queue;
+use Carp;
+
+has queue => (
+    is => 'ro',
+    isa => 'Thread::Queue',
+    init_arg => undef,
+    builder => '_build_queue',
+    handles => [qw(
+                      enqueue
+                      dequeue
+                      dequeue_nb
+                      pending
+                      peek
+                      insert
+                      extract
+              )],
+);
+
+has pipes => (
+    isa => 'ArrayRef',
+    is => 'ro',
+    builder => '_build_pipes',
+);
+
+sub _build_pipes {
+    my ($main,$thread);pipe($main,$thread);
+
+    return [$main,$thread];
+}
+
+sub _build_queue {
+    return Thread::Queue->new();
+}
+
+after enqueue => sub {
+    my ($self)=shift;
+    syswrite $self->pipes->[1],'0';
+};
+
+before dequeue => sub {
+    my ($self)=shift;
+    my $foo;sysread $self->pipes->[0],$foo,1;
+};
+
+sub add_watch {
+    my ($self,$sub)=@_;
+
+    Glib::IO->add_watch(fileno($self->pipes->[0]),'in',$sub);
+}
+
+sub signal {
+    my ($self)=@_;
+
+    croak "Not signaling on an empty queue, would block"
+        unless $self->pending;
+
+    syswrite $self->pipes->[1],'0';
+}
+
+no Moose;
+1;
diff --git a/thr.pl b/thr.pl
new file mode 100644
index 0000000..c648509
--- /dev/null
+++ b/thr.pl
@@ -0,0 +1,47 @@
+#!/usr/bin/perl
+use strict;
+use warnings;
+use threads;
+use Glib;
+use Queue;
+
+=head1 Signaling across threads to a Glib loop
+
+Looks like the best way is to use a pipe
+
+=cut
+
+my $q=Glib::Thread::Queue->new();
+
+threads->create(
+    sub{
+        print "sleeping\n";
+        sleep 2;
+        print "sending boo\n";
+        $q->enqueue('boo');
+        sleep 2;
+        print "inserting bar & foo\n";
+        $q->insert(0,'bar');
+        $q->insert(1,'foo');
+        print "signaling\n";
+        $q->signal();
+        print "signaling\n";
+        $q->signal();
+        sleep 2;
+        print "sending quit";
+        $q->enqueue('quit');
+});
+
+my $loop=Glib::MainLoop->new();
+$q->add_watch(sub{
+                  print "waking up\n";
+                  my $foo=$q->dequeue();
+                  print "got $foo\n";
+                  if ($foo eq 'quit') {
+                      print "quitting\n";
+                      $loop->quit;
+                  }
+                  return Glib::SOURCE_CONTINUE;
+              },
+          );
+$loop->run;
-- 
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