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when we have to use multithreading
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    Re: Threading

    1.  Your question is very broad. There are few non-trivial systems where the functionality can be met simply, quickly and reliably with only one thread. For example: [pick out a typical system that the target company sells and pick out a couple aspects of its function that would be better threaded off - heavy CPU, comms, multi-user - just pick out something likely & explain].

     2.  Depends on what you mean by 'executing tasks'. Multithreading would surely be beneficial if the threads process mutually independent data in a concurrent fashion - it reduces requirements for locks and probabilty of deadlocks increases in a super-linear fashion with the number of locks. OTOH, there is no issue with threads executing the same code, this is safe and very common.