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