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threads question in examLab practice test 1  RSS feed

 
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I am really sorry as i am posting such lengthy problems but please help me to understand this code
I know you will have to write lots of explanation but please help me
it is not the case that I have not tried but I am not able to understand
and the ExamLab explanation was not enough for me

here is the code


The anser is code compiles but no output and program does not terminate
 
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Prasad Kharkar wrote:I am really sorry as i am posting such lengthy problems but please help me to understand this code
I know you will have to write lots of explanation but please help me
it is not the case that I have not tried but I am not able to understand
and the ExamLab explanation was not enough for me



Hi,

I don't blame you for the question. Don't be apologetic. I assume most people taking ExamLab are in the same boat. These questions are really tough to crack. IMO this particular code is not trivial and it needs a lot of analysis and insight to be able to understand and answer. If I have the time and patience to do the analysis, I shall post my findings. Otherwise I am sure there are experts out here who will help!

Good luck
 
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Hi Prasad,

In this program you have two threads , main thread and b. After starting b thread , main goes to sleep.
Now b thread get chance to execute . It calls run method and doTask2() method , where it acquires lock of object a
and joins main thread . Due to this, thread b goes in block state with lock of object a .
Now when main thread come out of sleep state . It try to call doTask1() method on object a , but because this method is synchronized , it needs lock of object a , but lock is not available, because it is with thread b.

So both threads now in block state.


Hope it will help you
 
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dipayan chatterjee wrote:Hi Prasad,

In this program you have two threads , main thread and b. After starting b thread , main goes to sleep.
Now b thread get chance to execute . It calls run method and doTask2() method , where it acquires lock of object a
and joins main thread . Due to this, thread b goes in block state with lock of object a .
Now when main thread come out of sleep state . It try to call doTask1() method on object a , but because this method is synchronized , it needs lock of object a , but lock is not available, because it is with thread b.

So both threads now in block state.


Hope it will help you



Great, Exactly.
Try this code :
 
Prasad Kharkar
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very well replied dipayan
nice work
thanks for that
thread resolved
 
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