INTERVIEW QUESTIONS OPERATING SYSTEMS SHELL SCRIPTING DETAILS

Question: What is the difference between a 'thread' and a 'process'?

Answer: A process is a collection of virtual memory space, code, data, and system resources. A thread is code that is to be serially executed within a process. A processor executes threads, not processes, so each application has at least one process, and a process always has at least one thread of execution, known as the primary thread. A process can have multiple threads in addition to the primary thread

Thread – is stream of executable code within process. They are light weight process.



All thread with in a process share process instruction,code & data segment,open file descriptor,signal handler,userID and GroupID.



Thread has its own set of register including program counter,stack pointer

A process is a collection of virtual memory space, code, data, and system resources. A thread is code that is to be serially executed within a process. A processor executes threads, not processes, so each application has at least one process, and a process always has at least one thread of execution, known as the primary thread. A process can have multiple threads in addition to the primary thread

Thread – is stream of executable code within process. They are light weight process.



All thread with in a process share process instruction,code & data segment,open file descriptor,signal handler,userID and GroupID.



Thread has its own set of register including program counter,stack pointer


Source: CoolInterview.com

The major difference between threads and processes is
1.Threads share the address space of the process that
created it; processes have their own address.

2.Threads have direct access to the data segment of its
process; processes have their own copy of the data segment
of the parent process.

3.Threads can directly communicate with other threads of
its process; processes must use interprocess communication
to communicate with sibling processes.

4.Threads have almost no overhead; processes have
considerable overhead.

5.New threads are easily created; new processes require
duplication of the parent process.

6.Threads can exercise considerable control over threads of
the same process; processes can only exercise control over
child processes.

7.Changes to the main thread (cancellation, priority
change, etc.) may affect the behavior of the other threads
of the process; changes to the parent process does not
affect child processes.
Source: CoolInterview.com

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