What is Difference between thread and process?
Answer Posted / prashant
Both threads and processes are methods of parallelizing
an application. However, processes are independent execution
units that contain their own state information, use their
own address spaces, and only interact with each other via
interprocess communication mechanisms (generally managed by
the operating system). Applications are typically divided
into processes during the design phase, and a master process
explicitly spawns sub-processes when it makes sense to
logically separate significant application functionality.
Processes, in other words, are an architectural construct.
By contrast, a thread is a coding construct that doesn't
affect the architecture of an application. A single process
might contains multiple threads; all threads within a
process share the same state and same memory space, and can
communicate with each other directly, because they share the
same variables.
Threads typically are spawned for a short-term benefit
that is usually visualized as a serial task, but which
doesn't have to be performed in a linear manner (such as
performing a complex mathematical computation using
parallelism, or initializing a large matrix), and then are
absorbed when no longer required. The scope of a thread is
within a specific code module—which is why we can bolt-on
threading without affecting the broader application.
ref: http://www.ibiblio.org/java/course/week11/02.html
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