Add mutexes

src/core/mainwindow.cpp

@@ -1306,7 +1306,7 @@ void MainWindow::Exit() {
   else {
     if (app_->player()->engine()->is_fadeout_enabled()) {
       // To shut down the application when fadeout will be finished
-      QObject::connect(&*app_->player()->engine(), &EngineBase::FadeoutFinishedSignal, this, &MainWindow::DoExit);
+      QObject::connect(&*app_->player()->engine(), &EngineBase::Finished, this, &MainWindow::DoExit);
       if (app_->player()->GetState() == EngineBase::State::Playing) {
         app_->player()->Stop();
         ignore_close_ = true;

src/core/mutex_protected.h

@@ -0,0 +1,65 @@
+/*
+ * Strawberry Music Player
+ * Copyright 2024, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry 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.
+ *
+ * Strawberry 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 Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef MUTEX_PROTECTED_H
+#define MUTEX_PROTECTED_H
+
+#include <boost/noncopyable.hpp>
+
+#include <QMutex>
+#include <QMutexLocker>
+
+template<typename T>
+class mutex_protected : public boost::noncopyable {
+ public:
+  mutex_protected(const mutex_protected &value) : value_(value.value()) {}
+  mutex_protected(const T value) : value_(value) {}
+  ~mutex_protected() {}
+
+  T value() const {
+    QMutexLocker l(&mutex_);
+    return value_;
+  }
+
+  T operator==(const mutex_protected &value) const {
+    QMutexLocker l(&mutex_);
+    return value == value_;
+  }
+
+  T operator==(const T value) const {
+    QMutexLocker l(&mutex_);
+    return value == value_;
+  }
+
+  void operator=(const mutex_protected &value) {
+    QMutexLocker l(&mutex_);
+    value_ = value.value();
+  }
+
+  void operator=(const T value) {
+    QMutexLocker l(&mutex_);
+    value_ = value;
+  }
+
+ private:
+  T value_;
+  mutable QMutex mutex_;
+};
+
+#endif  // MUTEX_PROTECTED_H