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BTrace: A safe, dynamic tracing tool for the Java platform

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/*
 * Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the Classpath exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
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 */


import org.openjdk.btrace.core.annotations.BTrace;
import org.openjdk.btrace.core.annotations.OnMethod;
import org.openjdk.btrace.core.annotations.Self;

import static org.openjdk.btrace.core.BTraceUtils.*;

/*
 * This BTrace script inserts a probe into
 * method entry of java.lang.Thread.start() method.
 * At each Thread.start(), it raises a DTrace probe
 * in addition to printing the name of the thread.
 * A D-script like jthread.d may be used to get the
 * associated DTrace probe events.
 */
@BTrace
public class ThreadStart {
    @OnMethod(
            clazz = "java.lang.Thread",
            method = "start"
    )
    public static void onnewThread(@Self Thread t) {
        D.probe("jthreadstart", Threads.name(t));
        println("starting " + Threads.name(t));
    }
}