What is the difference between processes and threads in linux

The difference between processes and threads in Linux is: 1. A program has at least one process, and a process has at least one thread; 2. The division scale of threads is smaller than that of processes; 3. Processes have independent processes during execution. memory unit, while multiple threads share memory.

The definition of process and thread

(Recommended learning: linux tutorial)

The process is For a program with certain independent functions, regarding a running activity on a certain data set, the process is an independent unit for resource allocation and scheduling by the system;

Thread is the basic unit of an entity row of the process, and the thread itself is basically It does not own system resources and only owns some resources that are essential in operation (such as a program counter, a set of registers and a stack), but it can share all the resources owned by the process with other threads belonging to the same process. It is the CPU. The basic unit of scheduling and dispatch.

The difference between threads and processes

1. A program has at least one process, and a process has at least one thread;

2. The division scale of threads is smaller than that of processes , making multi-threaded programs have high concurrency;

3. The process has an independent memory unit during execution, and multiple threads share memory, thus greatly improving the running efficiency of the program;

4. Each independent thread has an entry point for program running, a sequential execution sequence and an exit point for the program. However, threads cannot be executed independently and must exist in the application program. The application program provides multiple thread execution control;

5. From a logical point of view, the significance of multi-threading lies in an application program. , multiple execution parts can be executed simultaneously. However, the operating system does not regard multiple threads as multiple independent applications to implement process scheduling and management and resource allocation. This is an important difference between processes and threads.

The above is the detailed content of What is the difference between processes and threads in linux. For more information, please follow other related articles on the PHP Chinese website!