ConcurrentNativeBinaryLoader: added javadoc and license

*	modified:   snaploader/src/main/java/com/avrsandbox/snaploader/ConcurrentNativeBinaryLoader.java

snaploader/src/main/java/com/avrsandbox/snaploader/ConcurrentNativeBinaryLoader.java

@@ -1,23 +1,69 @@
+/*
+ * Copyright (c) 2023, AvrSandbox, jSnapLoader
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * * Neither the name of 'AvrSandbox' nor the names of its contributors
+ *   may be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
 package com.avrsandbox.snaploader;
 
 import java.io.IOException;
 import java.util.concurrent.locks.ReentrantLock;
 
+/**
+ * A thread-safe implementation for the NativeBinaryLoader.
+ * 
+ * @author pavl_g
+ */
 public class ConcurrentNativeBinaryLoader extends NativeBinaryLoader {
 
+    /**
+     * The monitor object.
+     */
     protected final ReentrantLock lock = new ReentrantLock();
 
+    /**
+     * Instantiates a thread-safe {@link NativeBinaryLoader} object.
+     * 
+     * @param libraryInfo a data structure object holding the platform independent data for the library to load
+     */
     public ConcurrentNativeBinaryLoader(LibraryInfo libraryInfo) {
         super(libraryInfo);
     }
 
     @Override
     protected void cleanExtractBinary(NativeDynamicLibrary library) throws IOException {
         try {
+            /* CRITICAL SECTION STARTS */
             lock.lock();
             super.cleanExtractBinary(library);
         } finally {
             lock.unlock();
+            /* CRITICAL SECTION ENDS */
         }
     }
 }