145 lines
3.7 KiB
C++
145 lines
3.7 KiB
C++
/*
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* Copyright (C) 2009-2016 Paul Davis <paul@linuxaudiosystems.com>
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*
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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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*
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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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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "pbd/demangle.h"
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#include "pbd/error.h"
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#include "ardour/boost_debug.h"
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#include "ardour/session.h"
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#include "ardour/session_handle.h"
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#ifdef TRACE_SETSESSION_NULL
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#include <cassert>
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#include "pbd/stacktrace.h"
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#endif
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#include "pbd/i18n.h"
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using namespace std;
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using namespace ARDOUR;
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using namespace PBD;
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SessionHandlePtr::SessionHandlePtr ()
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: _session (0)
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#ifdef TRACE_SETSESSION_NULL
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, _gone_away_emitted (false)
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#endif
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{
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}
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SessionHandlePtr::SessionHandlePtr (Session* s)
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: _session (s)
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#ifdef TRACE_SETSESSION_NULL
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, _gone_away_emitted (false)
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#endif
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{
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if (_session) {
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_session->DropReferences.connect_same_thread (_session_connections, std::bind (&SessionHandlePtr::session_going_away, this));
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}
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}
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void
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SessionHandlePtr::set_session (Session* s)
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{
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_session_connections.drop_connections ();
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#ifdef TRACE_SETSESSION_NULL
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/* DropReferences may already have been disconnected due to signal emission ordering.
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*
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* An instance of this class (e.g. Ardour_UI) will need to call ::set_session() on member instances.
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*
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* Yet, when session_going_away() first calls set_session (0) on an instance that has SessionHandlePtr members,
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* they will reach here, and disocnnect signal handlers. Their derived implementation of ::session_going_away()
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* will not be called.
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*/
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if (!_gone_away_emitted && _session && !s) {
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/* if this assert goes off, some ::set_session() implementation calls
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* some_member->set_session (0);
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*
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* replace it with
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*
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* if (session) {
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* some_member->set_session (session);
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* }
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*/
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PBD::stacktrace (cerr, 10);
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assert (0);
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_gone_away_emitted = true;
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session_going_away ();
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}
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#endif
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if (_session) {
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_session = 0;
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}
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if (s) {
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_session = s;
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_session->DropReferences.connect_same_thread (_session_connections, std::bind (&SessionHandlePtr::session_going_away, this));
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#ifdef TRACE_SETSESSION_NULL
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_gone_away_emitted = false;
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#endif
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}
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}
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void
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SessionHandlePtr::session_going_away ()
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{
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#ifdef TRACE_SETSESSION_NULL
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if (_session && !_gone_away_emitted) {
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_gone_away_emitted = true;
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set_session (0);
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}
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#else
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set_session (0);
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#endif
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}
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/*-------------------------*/
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SessionHandleRef::SessionHandleRef (Session& s)
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: _session (s)
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{
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_session.DropReferences.connect_same_thread (*this, std::bind (&SessionHandleRef::session_going_away, this));
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_session.Destroyed.connect_same_thread (*this, std::bind (&SessionHandleRef::insanity_check, this));
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}
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SessionHandleRef::~SessionHandleRef ()
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{
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}
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void
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SessionHandleRef::session_going_away ()
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{
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/* a handleRef is allowed to exist at the time of DropReferences, but not at the time of Destroyed
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*/
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}
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void
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SessionHandleRef::insanity_check ()
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{
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#ifndef NDEBUG
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cerr << string_compose (
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_("programming error: %1"),
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string_compose("SessionHandleRef exists across session deletion! Dynamic type: %1 @ %2",
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PBD::demangled_name (*this), this))
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<< endl;
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#endif
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}
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