8. What are concurrency design patterns? Explain. Solution 8) we have five concurrency design patterns: ------------------------------------------------- First pattern is Active object design pattern . This pattern decouples method invocation. This is to enhance concurrency and simplify synchronized access to objects that reside in their own threads of control. Second pattern is Monitor pattern which synchronizes concurrent method execution to ensure that only one method at a time runs within an object. It allows obkect methods to schedule their execution sequence. Third pattern is haof sync / half async pattern which decouples synchrounous and synchronous processing in concurrent systems, so that it will simplify programmming without reducing performance undudly. Fourth pattern is Leader pattern which provides concurrency model where multiple threads take turns to share a set of event sources to detect, demultiplexm dispatch and process service requests that occur on the event sources. Fifth pattern is thread specific storage design pattern to allow multiple threads to use one logical global access point to retrieve an object that is local to a thread, without uncurring locking overload on each access to the object. .

1. 8. What are concurrency design patterns? Explain.
Solution
8)
we have five concurrency design patterns:
-------------------------------------------------
First pattern is Active object design pattern . This pattern decouples method invocation. This
is to enhance
concurrency and simplify synchronized access to objects that reside in their own threads of
control.
Second pattern is Monitor pattern which synchronizes concurrent method execution to ensure
that only one
method at a time runs within an object. It allows obkect methods to schedule their execution
sequence.
Third pattern is haof sync / half async pattern which decouples synchrounous and
synchronous processing in
concurrent systems, so that it will simplify programmming without reducing performance
undudly.
Fourth pattern is Leader pattern which provides concurrency model where multiple threads
take turns to share
a set of event sources to detect, demultiplexm dispatch and process service requests that occur on
the
event sources.
Fifth pattern is thread specific storage design pattern to allow multiple threads to use one
logical global
access point to retrieve an object that is local to a thread, without uncurring locking overload on
each access
to the object.