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https://github.com/RetroShare/RetroShare.git
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68 lines
3.0 KiB
C
68 lines
3.0 KiB
C
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#pragma once
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/*
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* RetroShare Qml App
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* Copyright (C) 2017 Gioacchino Mazzurco <gio@eigenlab.org>
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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 Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <QObject>
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#include <QQmlApplicationEngine>
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class RsQmlAppEngine : public QQmlApplicationEngine
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{
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Q_OBJECT
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public:
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RsQmlAppEngine(bool isMainInstance = false, QObject* parent = nullptr) :
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QQmlApplicationEngine(parent)
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{ if(isMainInstance) mMainInstance = this; }
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~RsQmlAppEngine() { if(mMainInstance == this) mMainInstance = nullptr; }
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static RsQmlAppEngine* mainInstance() { return mMainInstance; }
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public slots:
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void handleUri(QString uri);
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private:
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/**
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* Using a static variable as QQmlApplicationEngine singleton caused crash
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* on application termination, while using a dinamically allocated one
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* causes deadlock on termination in QML WorkerScript destructor object
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* with the following stacktrace
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* #0 0x00007f0a8c3e4c67 in sched_yield () from /lib64/libc.so.6
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* #1 0x00007f0a8db5191c in QQuickWorkerScriptEngine::~QQuickWorkerScriptEngine() () from /usr/lib64/libQt5Qml.so.5
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* #2 0x00007f0a8db51949 in QQuickWorkerScriptEngine::~QQuickWorkerScriptEngine() () from /usr/lib64/libQt5Qml.so.5
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* #3 0x00007f0a8d61359c in QObjectPrivate::deleteChildren() () from /usr/lib64/libQt5Core.so.5
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* #4 0x00007f0a8d61ab83 in QObject::~QObject() () from /usr/lib64/libQt5Core.so.5
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* #5 0x00007f0a8da7d27d in QQmlEngine::~QQmlEngine() () from /usr/lib64/libQt5Qml.so.5
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* #6 0x00007f0a8dafeb39 in QQmlApplicationEngine::~QQmlApplicationEngine() () from /usr/lib64/libQt5Qml.so.5
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* #7 0x00007f0a8d61359c in QObjectPrivate::deleteChildren() () from /usr/lib64/libQt5Core.so.5
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* #8 0x00007f0a8d61ab83 in QObject::~QObject() () from /usr/lib64/libQt5Core.so.5
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* #9 0x00007f0a8d5ede58 in QCoreApplication::~QCoreApplication() () from /usr/lib64/libQt5Core.so.5
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* #10 0x00007f0a8dd2d97b in QGuiApplication::~QGuiApplication() () from /usr/lib64/libQt5Gui.so.5
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* #11 0x000000000041b6b4 in main (argc=1, argv=0x7fff218dd1a8) at ../../../../Development/rs-develop/retroshare-qml-app/src/main-app.cpp:58
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*
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* To avoid this we leave the creation of the instance to the user (main)
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* and to store the static pointer to that, the pointer can be null at early
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* stage of execution (or if the user forget to initialize it properly) so
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* early user (JNI intent handler) should take this in account
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*/
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static RsQmlAppEngine* mMainInstance;
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};
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