1 /*
   2  * Copyright (c) 2004, 2011, Oracle and/or its affiliates. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  *   - Redistributions of source code must retain the above copyright
   9  *     notice, this list of conditions and the following disclaimer.
  10  *
  11  *   - Redistributions in binary form must reproduce the above copyright
  12  *     notice, this list of conditions and the following disclaimer in the
  13  *     documentation and/or other materials provided with the distribution.
  14  *
  15  *   - Neither the name of Oracle nor the names of its
  16  *     contributors may be used to endorse or promote products derived
  17  *     from this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  20  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  26  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  27  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  28  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  29  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31 
  32 /*
  33  * This source code is provided to illustrate the usage of a given feature
  34  * or technique and has been deliberately simplified. Additional steps
  35  * required for a production-quality application, such as security checks,
  36  * input validation and proper error handling, might not be present in
  37  * this sample code.
  38  */
  39 
  40 
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 
  45 #include "jni.h"
  46 #include "jvmti.h"
  47 
  48 #include "agent_util.h"
  49 
  50 #include "Thread.hpp"
  51 
  52 /* Implementation of the Thread class */
  53 
  54 Thread::Thread(jvmtiEnv *jvmti, JNIEnv *env, jthread thread)
  55 {
  56     jvmtiError      err;
  57     jvmtiThreadInfo info;
  58 
  59     /* Get and save the name of the thread */
  60     info.name = NULL;
  61     (void)strcpy(name, "Unknown");
  62     err = jvmti->GetThreadInfo(thread, &info);
  63     check_jvmti_error(jvmti, err, "get thread info");
  64     if ( info.name != NULL ) {
  65         (void)strncpy(name, info.name, (int)sizeof(name)-1);
  66         name[(int)sizeof(name)-1] = 0;
  67         deallocate(jvmti, info.name);
  68     }
  69 
  70     /* Clear thread counters */
  71     contends = 0;
  72     waits    = 0;
  73     timeouts = 0;
  74 }
  75 
  76 Thread::~Thread()
  77 {
  78     /* Send out summary message */
  79     stdout_message("Thread %s summary: %d waits plus %d contended\n",
  80         name, waits, contends);
  81 }
  82 
  83 void Thread::monitor_contended_enter(jvmtiEnv* jvmti, JNIEnv *env,
  84              jthread thread, jobject object)
  85 {
  86     contends++;
  87 }
  88 
  89 void Thread::monitor_wait(jvmtiEnv* jvmti, JNIEnv *env,
  90                jthread thread, jobject object, jlong timeout)
  91 {
  92     waits++;
  93 }
  94 
  95 void Thread::monitor_waited(jvmtiEnv* jvmti, JNIEnv *env,
  96                jthread thread, jobject object, jboolean timed_out)
  97 {
  98     if ( timed_out ) {
  99         timeouts++;
 100     }
 101 }