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/*
Copyright (C) 2012 Paul Davis
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "pbd/event_loop.h"
#include "pbd/stacktrace.h"
using namespace PBD;
using namespace std;
static void do_not_delete_the_loop_pointer (void*) { }
Glib::Threads::Private<EventLoop> EventLoop::thread_event_loop (do_not_delete_the_loop_pointer);
EventLoop*
EventLoop::get_event_loop_for_thread() {
return thread_event_loop.get ();
}
void
EventLoop::set_event_loop_for_thread (EventLoop* loop)
{
thread_event_loop.set (loop);
}
void*
EventLoop::invalidate_request (void* data)
{
InvalidationRecord* ir = (InvalidationRecord*) data;
/* Some of the requests queued with an EventLoop may involve functors
* that make method calls to objects whose lifetime is shorter
* than the EventLoop's. We do not want to make those calls if the
* object involve has been destroyed. To prevent this, we
* provide a way to invalidate those requests when the object is
* destroyed.
*
* An object was passed to __invalidator() which added a callback to
* EventLoop::invalidate_request() to its "notify when destroyed"
* list. __invalidator() returned an InvalidationRecord that has been
* to passed to this function as data.
*
* The object is currently being destroyed and so we want to
* mark all requests involving this object that are queued with
* any EventLoop as invalid.
*
* As of April 2012, we are usign sigc::trackable as the base object
* used to queue calls to ::invalidate_request() to be made upon
* destruction, via its ::add_destroy_notify_callback() API. This is
* not necessarily ideal, but it is very close to precisely what we
* want, and many of the objects we want to do this with already
* inherit (indirectly) from sigc::trackable.
*/
if (ir->event_loop) {
Glib::Threads::Mutex::Lock lm (ir->event_loop->slot_invalidation_mutex());
for (list<BaseRequestObject*>::iterator i = ir->requests.begin(); i != ir->requests.end(); ++i) {
(*i)->valid = false;
(*i)->invalidation = 0;
}
delete ir;
}
return 0;
}
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