difference between thread and process.

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 Answer:

     Process:

         . Basic element of resource allocation in the operating system.

         . Possesses independent resources:

             a. code segment

             b. data segment

                 i. constant data

                 ii. global variable

                 iii. stack

                 iv. heap

             c. register

             d. program counter

         . Have independent virtual address mapping.

         . It has life cycle, it is running, in contrast to a program.

     Thread:

         . Basic element of CPU scheduling.

         . Possesses part of independent resources:

             a. register

             b. stack

             c. program counter

         . Multiple threads share part of resources in same process:

             a. code segment

             b. data segment

                 i. constant data

                 ii. global variable

                 iii. heap

         . All threads in a process share the same address space.

         . It has life cycle