jvm线程分析1 概述

jvm线程分类
代码如下：
enum ThreadType {
    vm_thread,
    cgc_thread,        // Concurrent GC thread
    pgc_thread,        // Parallel GC thread
    java_thread,
    compiler_thread,
    watcher_thread
  };

enum ThreadPriority {        // JLS 20.20.1-3
  NoPriority       = -1,     // Initial non-priority value
  MinPriority      =  1,     // Minimum priority
  NormPriority     =  5,     // Normal (non-daemon) priority
  NearMaxPriority  =  9,     // High priority, used for VMThread
  MaxPriority      = 10      // Highest priority, used for WatcherThread
                             // ensures that VMThread doesn't starve profiler
};

enum ThreadState {
  ALLOCATED,                    // Memory has been allocated but not initialized
  INITIALIZED,                  // The thread has been initialized but yet started
  RUNNABLE,                     // Has been started and is runnable, but not necessarily running
  MONITOR_WAIT,                 // Waiting on a contended monitor lock
  CONDVAR_WAIT,                 // Waiting on a condition variable
  OBJECT_WAIT,                  // Waiting on an Object.wait() call
  BREAKPOINTED,                 // Suspended at breakpoint
  SLEEPING,                     // Thread.sleep()
  ZOMBIE                        // All done, but not reclaimed yet
};
JavaThread Threads Thread VmThread
JNI_CreateJavaVM
Threads::create_vm
  |--> Thread::set_as_starting_thread
        |
        |--> os::create_main_thread
              |
              |-->create_os_thread