android dalvik VM's thread state .

本文主要是介绍android dalvik VM's thread state .，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

I got a ANR crash , the crash thread’s state is “MONITOR” which found in file traces_dut7_run3.txt(detail information :

DALVIK THREADS:

"main" prio=5 tid=3 MONITOR

| group="main" sCount=1 dsCount=0 s=N obj=0x40026240 self=0xbda8

| sysTid=26755 nice=0 sched=0/0 cgrp=unknown handle=-1344001376

at com.android.vending.api.RequestManager.reset(RequestManager.java:~273)

My question is what meaning the MONITOR state of java thread ?

Only the following state “BLOCKED”, “NEW” , “RUNNABLE” ,”TERMINATED” , “TIMED_WAITING” , “WAITING” , not “MONITOR” were found in Thread.java at page

http://developer.android.com/reference/java/lang/Thread.State.html .

However the following state "ZOMBIE", "RUNNABLE", "TIMED_WAIT", "MONITOR", "WAIT", "INITIALIZING", "STARTING", "NATIVE", "VMWAIT" were found

in Thread.c at page http://lxr.e2g.org/source/dalvik/vm/Thread.c?a=sparc64#L2845 , but no detail information about the state in Thread.c was found .

My other question is what the corresponding relationship between state in Thread.java and state in Thread.c at Android platform ?

ANSWER :

in android dalvik VM , at java.lang.VMThread.java , has following code .

      92     /**
     93      * Holds a mapping from native Thread statii to Java one. Required for
     94      * translating back the result of getStatus().
     95      */
     96     static final Thread.State[] STATE_MAP = new Thread.State[] {
     97         Thread.State.TERMINATED,     // ZOMBIE
     98         Thread.State.RUNNABLE,       // RUNNING
     99         Thread.State.TIMED_WAITING, // TIMED_WAIT
    100         Thread.State.BLOCKED,        // MONITOR
    101         Thread.State.WAITING,        // WAIT
    102         Thread.State.NEW,            // INITIALIZING
    103         Thread.State.NEW,            // STARTING
    104         Thread.State.RUNNABLE,       // NATIVE
    105         Thread.State.WAITING         // VMWAIT
    106     };