import java.util.concurrent.Executor; import java.util.concurrent.Executors; public class App { static class Worker implements Runnable { public Worker() {} public void run() { while (true) { System.out.println("Sleeping"); try { Thread.sleep(5000); } catch (InterruptedException e) { e.printstacktrace(); } } } } public static void main(String[] args) { Executor executor = Executors.newSingleThreadExecutor(); executor.execute(new Worker()); } }
该代码是使用Maven构build的，并使用java -jar ...执行。
如果我运行ps -ef -o nlwp,pid,lwp,args | grep 3779 | grep -v grep ps -ef -o nlwp,args | grep 3779 | grep -v grep ps -ef -o nlwp,args | grep 3779 | grep -v grep列出进程及其关联进程的个数，我得到：
15 3779 3779 _ java -jar ./threadsim-1.0-SNAPSHOT.jar <snip>
我可以看到这个过程有15个与之相关的轻量级进程（最左边的头文件是ps的nlwp格式，即轻量级进程的数量）。 根据我的统计，应该有两个：主线程和我创build的“worker”线程。
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在Win XP 64位上无法连接到XAMPP下的本地apache安装。 帮帮我！
如果您运行jstack来查看每个线程的堆栈跟踪，您将得到这些线程正在执行的提示：
$ jps -lvm 16321 com.intellij.rt.execution.application.AppMain App -Didea.launcher.port=7532 -Didea.launcher.bin.path=/opt/idea-IU-141.1192.2/bin -Dfile.encoding=UTF-8 $ jstack 16321 2015-06-11 15:15:49 Full thread dump Java HotSpot(TM) 64-Bit server VM (25.45-b02 mixed mode): "Attach listner" #13 daemon prio=9 os_prio=0 tid=0x00007f4268001000 nid=0x4040 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "DestroyJavaVM" #12 prio=5 os_prio=0 tid=0x00007f42cc00a000 nid=0x3fc3 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "pool-1-thread-1" #11 prio=5 os_prio=0 tid=0x00007f42cc13a800 nid=0x3fe0 waiting on condition [0x00007f427c4fe000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at App$Worker.run(App.java:14) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) "Monitor Ctrl-Break" #10 daemon prio=5 os_prio=0 tid=0x00007f42cc137800 nid=0x3fdf runnable [0x00007f429b101000] java.lang.Thread.State: RUNNABLE at java.net.PlainSocketImpl.socketAccept(Native Method) at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:404) at java.net.serverSocket.implAccept(serverSocket.java:545) at java.net.serverSocket.accept(serverSocket.java:513) at com.intellij.rt.execution.application.AppMain$1.run(AppMain.java:90) at java.lang.Thread.run(Thread.java:745) "Service Thread" #9 daemon prio=9 os_prio=0 tid=0x00007f42cc0d2000 nid=0x3fdd runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE "C1 CompilerThread3" #8 daemon prio=9 os_prio=0 tid=0x00007f42cc0cd000 nid=0x3fdc waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "C2 CompilerThread2" #7 daemon prio=9 os_prio=0 tid=0x00007f42cc0cb000 nid=0x3fdb waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "C2 CompilerThread1" #6 daemon prio=9 os_prio=0 tid=0x00007f42cc0c9000 nid=0x3fda waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "C2 CompilerThread0" #5 daemon prio=9 os_prio=0 tid=0x00007f42cc0c6000 nid=0x3fd9 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "Signal dispatcher" #4 daemon prio=9 os_prio=0 tid=0x00007f42cc0c4800 nid=0x3fd8 runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE "Finalizer" #3 daemon prio=8 os_prio=0 tid=0x00007f42cc08c000 nid=0x3fd0 in Object.wait() [0x00007f42a0208000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x0000000718b06f58> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143) - locked <0x0000000718b06f58> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164) at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209) "Reference Handler" #2 daemon prio=10 os_prio=0 tid=0x00007f42cc08a000 nid=0x3fcf in Object.wait() [0x00007f42a0309000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x0000000718b06998> (a java.lang.ref.Reference$Lock) at java.lang.Object.wait(Object.java:502) at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:157) - locked <0x0000000718b06998> (a java.lang.ref.Reference$Lock) "VM Thread" os_prio=0 tid=0x00007f42cc085000 nid=0x3fce runnable "GC task thread#0 (ParallelGC)" os_prio=0 tid=0x00007f42cc01f800 nid=0x3fc4 runnable "GC task thread#1 (ParallelGC)" os_prio=0 tid=0x00007f42cc021000 nid=0x3fc5 runnable "GC task thread#2 (ParallelGC)" os_prio=0 tid=0x00007f42cc023000 nid=0x3fc6 runnable "GC task thread#3 (ParallelGC)" os_prio=0 tid=0x00007f42cc025000 nid=0x3fc7 runnable "GC task thread#4 (ParallelGC)" os_prio=0 tid=0x00007f42cc026800 nid=0x3fc8 runnable "GC task thread#5 (ParallelGC)" os_prio=0 tid=0x00007f42cc028800 nid=0x3fc9 runnable "GC task thread#6 (ParallelGC)" os_prio=0 tid=0x00007f42cc02a000 nid=0x3fca runnable "GC task thread#7 (ParallelGC)" os_prio=0 tid=0x00007f42cc02c000 nid=0x3fcb runnable "GC task thread#8 (ParallelGC)" os_prio=0 tid=0x00007f42cc02e000 nid=0x3fcc runnable "GC task thread#9 (ParallelGC)" os_prio=0 tid=0x00007f42cc02f800 nid=0x3fcd runnable "VM Periodic Task Thread" os_prio=0 tid=0x00007f42cc0d5000 nid=0x3fde waiting on condition JNI global references: 15
你可以看到有线程进行后台编译，GC，终结器/参考清理，听Ctrl-Break和其他一些保持内容的东西。
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