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Synchronization  RSS feed

 
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Hello,

Can anybody explain me when and why do I need

a) class level synchronization
b) method level synchronization() and
c) synchronization block

Thank you in advance.

Kousik
 
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Hi Kousik,

Synchronization is always done on an object. It is to ensure that only one thread, using the same object, executes the code in the synchronized block at any instance.
The 3 types that you have mentioned just uses different objects for synchronization, viz.:

1) Static synchronized methods uses the class object.
2) non-static synchronized methods uses the "this" object.
3) Synchronized blocks can use any object that the user specifies.

Static synchronized methods ensure that at no time two threads can execute the code simultaneously.
Non-Static synchronized methods ensure that at no time two threads that uses a single instance of that class can execute the code simultaneously.
Synchronized blocks ensure that at no time two threads that uses the same object instance, as is used to synchronize, can execute the code simultaneously.

Hope it is clear.
 
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