On 20 November 2010 20:59, James Moschou <[email protected]> wrote:
>> You can attach the .callback to any event source in the same way. So e.g.
>> when data arrive from the process or the child terminates etc.
>
>> But it's easy to wrap it in one. Just spawn_async_with_pipes and arrange the
>> .callback to be called when results are available and yield.
>
> I think I got this working, it's compiling OK and it runs as expected
> up until the last task is completed. But then it segfaults on some of
> the generated C code. I'll try and make a test case later, as the
> actual code is fairly convoluted.
>
> Cheers
> James
>
Here's an incredibly pared back version of what I have:
class Task : Object {
Pid _pid;
Source _source;
public async void run_async () {
try {
Process.spawn_async_with_pipes (null,
{"whois", "www.google.com"},
null,
SpawnFlags.SEARCH_PATH |
SpawnFlags.DO_NOT_REAP_CHILD,
null,
out _pid,
null,
null,
null);
_source = new GLibFixes.ChildWatchSource (_pid);
_source.attach (null);
_source.set_callback (run_async.callback);
yield;
}
catch (Error error) {
stderr.printf ("%s\n", error.message);
}
Process.close_pid (_pid);
}
}
int main (string[] args) {
Task task = new Task ();
task.run_async.begin ();
new MainLoop ().run ();
return 0;
}
There's a problem one of the GLib bindings so you also need:
[CCode (cprefix = "G", lower_case_cprefix = "g_", cheader_filename =
"glib.h", gir_namespace = "GLib", gir_version = "2.0")]
namespace GLibFixes {
public class ChildWatchSource : GLib.Source {
public ChildWatchSource (GLib.Pid pid);
}
}
Compile with:
valac test.vala fixes.vapi --pkg gio-2.0
It executes the process normally, but then segfaults. I'm not sure if
I'm attaching the callback properly.
Cheers
James
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