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smita_smita
Posts:502
Registered: 12/16/04

synchronisation methods in same class
Nov 7, 2009 7:49 AM

I have three methods in same class A,B,C IN which A,B synchronised and c not.
my question is if one thread is in A.another thread cann access B OR C?

DarrylBurke
Posts:15,598
Registered: 7/2/07

Re: synchronisation methods in same class
Nov 7, 2009 9:18 AM (reply 1 of 6) (In reply to original post )

You tell us. After all, it's your homework.

db

jverd
Posts:51,846
Registered: 3/30/99

Re: synchronisation methods in same class
Nov 7, 2009 9:51 AM (reply 2 of 6) (In reply to original post )

Syncing a block on the object pointed to by X

synchronized (X) { /* do stuff */}

simply waits until no other thread is synced on that object, and then enters the block.

Declaring a non-static method synchronized is the same as doing

synchronized (this) { /* do stuff */ }

Calling a non-synced method or executing a non-synced block or statement does not wait for the lock.

georgemc
Posts:16,804
Registered: 5/8/06

Re: synchronisation methods in same class
Nov 7, 2009 9:59 AM (reply 3 of 6) (In reply to #2 )

jverd wrote:
Syncing a block on the object pointed to by X

synchronized (X) { /* do stuff */}

simply waits until no other thread is synced on that object, and then enters the block.

Declaring a non-static method synchronized is the same as doing

synchronized (this) { /* do stuff */ }

Calling a non-synced method or executing a non-synced block or statement does not wait for the lock.

Duke-wh0ring?? :)

jverd
Posts:51,846
Registered: 3/30/99

Re: synchronisation methods in same class
Nov 7, 2009 10:03 AM (reply 4 of 6) (In reply to #3 )

georgemc wrote:
Duke-wh0ring?? :)

Totally. I need to build up a nest egg for when I retire.

smita_smita
Posts:502
Registered: 12/16/04

Re: synchronisation methods in same class
Nov 7, 2009 10:28 AM (reply 5 of 6) (In reply to #3 )

no synchronized block.all are synchronized methods.
synchronized method A()
synchronized method b()
method c()
two threads t1 and t2
t1 accesses method A()
whether t2 can access the method B or NOT? while T1 in A().
Thanks

jverd
Posts:51,846
Registered: 3/30/99

Re: synchronisation methods in same class
Nov 7, 2009 10:39 AM (reply 6 of 6) (In reply to #5 )

Helpful

smita_smita wrote:
no synchronized block.all are synchronized methods.

Doesn't matter. My explanation covers both.

synchronized method A()
synchronized method b()
method c()
two threads t1 and t2
t1 accesses method A()
whether t2 can access the method B or NOT? while T1 in A().

I answered your question.

And this is a multithreading question that's actually very easy to test with code.

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