Add a high-performance thread local storage class.

src/Utility/ThreadLocal.cpp

@@ -0,0 +1,31 @@
+ /*
+ * Copyright 2020, WindTerm.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "ThreadLocal.h"
+
+#include <QThread>
+
+void ThreadLocalWatcher::stopWatchCurrentThread() {
+	QThread::currentThread()->disconnect(this);
+}
+
+void ThreadLocalWatcher::watchCurrentThread() {
+	boost::thread::id id = boost::this_thread::get_id();
+
+	connect(QThread::currentThread(), &QThread::finished, this, [this, id]() {
+		clear(id);
+	});
+}