Mercurial > octave
view libinterp/corefcn/event-queue.h @ 31192:7401a2501be4
maint: merge stable to default
author | Rik <rik@octave.org> |
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date | Mon, 15 Aug 2022 21:06:21 -0700 |
parents | 796f54d4ddbf |
children | e88a07dec498 |
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//////////////////////////////////////////////////////////////////////// // // Copyright (C) 2012-2022 The Octave Project Developers // // See the file COPYRIGHT.md in the top-level directory of this // distribution or <https://octave.org/copyright/>. // // This file is part of Octave. // // Octave 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 3 of the License, or // (at your option) any later version. // // Octave 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 Octave; see the file COPYING. If not, see // <https://www.gnu.org/licenses/>. // //////////////////////////////////////////////////////////////////////// #if ! defined (octave_event_queue_h) #define octave_event_queue_h 1 #include "octave-config.h" #include <queue> #include <memory> #include "action-container.h" namespace octave { class event_queue : public action_container { public: event_queue (void) : m_fifo () { } // No copying! event_queue (const event_queue&) = delete; event_queue& operator = (const event_queue&) = delete; // Destructor should not raise an exception, so all actions registered // should be exception-safe. If you're not sure, see event_queue_safe. ~event_queue (void) { run (); } void run_first (void) { if (! empty ()) { // No leak on exception! std::unique_ptr<elem> ptr (m_fifo.front ()); m_fifo.pop (); ptr->run (); } } void discard_first (void) { if (! empty ()) { elem *ptr = m_fifo.front (); m_fifo.pop (); delete ptr; } } std::size_t size (void) const { return m_fifo.size (); } protected: void add_action (elem *new_elem) { m_fifo.push (new_elem); } //-------- std::queue<elem *> m_fifo; }; // Like event_queue, but this one will guard against the // possibility of seeing an exception (or interrupt) in the cleanup actions. // Not that we can do much about it, but at least we won't crash. class event_queue_safe : public event_queue { public: event_queue_safe (void) : event_queue () { } // No copying! event_queue_safe (const event_queue_safe&) = delete; event_queue_safe& operator = (const event_queue_safe&) = delete; ~event_queue_safe (void) { while (! empty ()) { try { run_first (); } catch (...) // Yes, the black hole. Remember we're in a dtor. { warn_unhandled_exception (); } } } private: void warn_unhandled_exception (void) const; }; } #endif