Sunday, 14 April 2019

Difference between process and thread

Difference between process and thread.

Point 1:
A process is an executing instance of an application.
Thread is independent path of execution within a process. Process can have multiple threads,

Point 2:
Threads itself is capable enough to do all the things a process does and thread is a part of process that is why thread can be termed as light-weight process.

Point 3:
Since all the Threads are part of a same Process they all share same memory allocated by Process.
Process use memory allocated by OS.

Point 4:
Inter-thread communication between threads is easy whereas Inter-process communication is difficult.

Point 5:
Processes have independent data and code segments.
Thread shares the data segment, code segment, files etc. with its peer threads.

Point 6:
Process switching is complex as compared to thread switching because of the amount of variables need to be maintained in both of the case.

Per process items Per thread items
Address space  Program counter
Global variables Registers
Open files Stack
Child processes State
Pending alarms
Signals and signal handlers
Accounting information
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