thread n process

Process

• Independant

• interact only through system IPC

• separate address space

Thread

• subset of process

• share memory

• threads share address space

https://stackoverflow.com/questions/200469/what-is-the-difference-between-a-process-and-a-thread

Both processes and threads are independent sequences of execution.

The typical difference is that threads run in a shared memory space, while processes run in separate memory spaces.

Threads are an operating environment feature, rather than a CPU feature.

Process Each process provides the resources needed to execute a program. A process has a virtual address space, executable code, open handles to system objects, a security context, a unique process identifier, environment variables, a priority class, minimum and maximum working set sizes, and at least one thread of execution. Each process is started with a single thread, often called the primary thread, but can create additional threads from any of its threads.

Thread A thread is an entity within a process that can be scheduled for execution. All threads of a process share its virtual address space and system resources. In addition, each thread maintains exception handlers, a scheduling priority, thread local storage, a unique thread identifier, and a set of structures the system will use to save the thread context until it is scheduled. The thread context includes the thread's set of machine registers, the kernel stack, a thread environment block, and a user stack in the address space of the thread's process. Threads can also have their own security context, which can be used for impersonating clients.