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https://github.com/wesnoth/wesnoth
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3ac7f8d970
A few cases of NULL were missed, since changing them led to errors (Mainly instances where it was passed to a boost::function)
66 lines
1.6 KiB
C++
66 lines
1.6 KiB
C++
/*
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Copyright (C) 2009 - 2016 by Daniel Franke.
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Part of the Battle for Wesnoth Project http://www.wesnoth.org/
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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.
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See the COPYING file for more details.
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*/
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#include "save_blocker.hpp"
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#include <exception>
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#include <iostream>
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play_controller* save_blocker::controller_ = nullptr;
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void (play_controller::*save_blocker::callback_)() = nullptr;
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SDL_sem* save_blocker::sem_ = SDL_CreateSemaphore(1);
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save_blocker::save_blocker() {
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block();
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}
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save_blocker::~save_blocker() {
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try {
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unblock();
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if(controller_ && callback_) {
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(controller_->*callback_)();
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controller_ = nullptr;
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callback_ = nullptr;
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}
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} catch (std::exception & e) {
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std::cerr << "Save blocker dtor swallowing an exception: " << e.what() << "\n";
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}
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}
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void save_blocker::on_unblock(play_controller* controller, void (play_controller::*callback)()) {
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if(try_block()) {
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unblock();
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(controller->*callback)();
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} else {
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controller_ = controller;
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callback_ = callback;
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}
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}
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bool save_blocker::saves_are_blocked() {
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return SDL_SemValue(sem_) == 0;
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}
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void save_blocker::block() {
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SDL_SemWait(sem_);
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}
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bool save_blocker::try_block() {
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return SDL_SemTryWait(sem_) == 0;
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}
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void save_blocker::unblock() {
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assert(SDL_SemValue(sem_) == 0);
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SDL_SemPost(sem_);
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}
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