Coverage Summary for Class: TracePinnedThreadsKt (dev.suresh.vthread)

 package dev.suresh.vthread
 
 import java.io.*
 import java.time.*
 import java.util.concurrent.locks.*
 
 /**
  * Run with -Djdk.tracePinnedThreads=short|full
  *
  * [TracePinnedThreads.java](https://github.com/openjdk/jdk/blob/master/test/jdk/java/lang/Thread/virtual/TracePinnedThreads.java)
  *
  * [VirtualThreadTests](https://github.com/openjdk/jdk/tree/master/test/jdk/java/lang/Thread/virtual)
  *
  * [LoomTroubleshootingGuide](https://wiki.openjdk.java.net/display/loom/Troubleshooting)
  */
 fun main() {
   System.setProperty("jdk.tracePinnedThreads", "full")
   tracePinnedThread()
 }
 
 fun tracePinnedThread() {
   val lock = Object()
   val out = System.out
   val baos = ByteArrayOutputStream()
   System.setOut(PrintStream(baos))
 
   try {
     Thread.ofVirtual()
         .start {
           synchronized(lock) {
             val nanos: Long = Duration.ofSeconds(1).toNanos()
             LockSupport.parkNanos(nanos)
             // OR lock.wait()
           }
         }
         .join()
     System.out.flush()
   } finally {
     System.setOut(out)
   }
 
   val output = baos.toString() // default charset
   println(output)
   val expected = "<== monitors:1"
   check(expected in output) { """expected:"$expected"""" }
 }