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What is the difference between a process and a thread in Linux? I believe that many inexperienced people are at a loss about this, so this article summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

Comparison and difference between process and Thread in Linux

1. Concept

Process: a running program.

Thread: an execution path in a process.

two。 Difference

(1) usually several threads can be included in a process, which can take advantage of the resources owned by the process. In the operating system that introduces threads, the process is usually regarded as the basic unit of allocating resources, and the thread is regarded as the basic unit of independent operation and scheduling.

(2) the difference between a thread and a process is that the child process and the parent process have different code and data space, while multiple threads share the data space, and each thread has its own execution stack and program counter for its execution context. Multithreading is mainly to save CPU time, play and use, depending on the specific situation. The running of the thread requires the use of the computer's memory resources and CPU.

(3) processes are independent of each other and shared among threads of the same process. Threads within one process are not visible to other processes.

(4) the context switching of threads is much faster than that between processes.

(5) the process is an unexecutable entity, and the program is an inanimate entity. Only when the processor gives life to the program can it become an active entity, which we call a process.

3. What is the relationship and difference between thread and process?

The relationship between processes and threads:

(1) A thread can only belong to one process, and a process can have multiple threads, but at least one thread.

(2) Resources are allocated to a process, and all threads of the same process share all the resources of the process.

(3) the processor is allocated to the thread, that is, what is really running on the processor is the thread.

(4) in the process of execution, threads need to cooperate and synchronize. The threads of different processes should use the method of message communication to achieve synchronization. A thread is an execution unit within a process and a schedulable entity within a process.

The difference between processes and threads:

(1) scheduling: thread is the basic unit of scheduling and allocation, and process is the basic unit of owning resources.

(2) concurrency: it can be executed not only between processes, but also among multiple threads of the same process.

(3) owning resources: a process is an independent unit that owns resources. Threads do not own system resources, but can access resources belonging to the process.

(4) system overhead: when creating or undoing a process, because the system allocates and reclaims resources for it, the overhead of the system is obviously greater than that of creating or undoing threads.

After reading the above, have you mastered the method of what is the difference between processes and threads in Linux? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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