android dalvik VM's thread state .

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 };

So MONITOR state in Thread.c is BLOCKED state in Thread.java. They are same constant except name is different.

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