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   DIR Return to: Common operating systems related questions
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       #Post#: 25--------------------------------------------------
       Deadlock prevention
       By: avinash.srin Date: August 26, 2011, 6:44 am
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       What is a deadlock and how do you overcome it?
       #Post#: 26--------------------------------------------------
       Re: Deadlock prevention
       By: avinash.srin Date: August 26, 2011, 6:46 am
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       A lock occurs when multiple processes try to access the same
       resource at the same time.
       One process loses out and must wait for the other to finish.
       A deadlock occurs when the waiting process is still holding on
       to another resource that the first needs before it can finish.
       So, an example:
       Resource A and resource B are used by process X and process Y
       X starts to use A.
       X and Y try to start using B
       Y 'wins' and gets B first
       now Y needs to use A
       A is locked by X, which is waiting for Y
       Deadlocks can be avoided by:
       1. Narrow down the synchronization's scope to as small a block
       as possible.
       2. Try to avoid locking multiple objects if possible.
       3. Use a consistent lock order, by which if multiple locks need
       to be acquired will be acquired in a particular predefined
       order.
       4. Maintain a proper documentation about the order, and other
       locking strategy if used.
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