What are processes and threads
Process is the basic unit of resource allocation. It is an instance of program execution and is created when the program is running. Thread is the smallest unit of program execution and is an execution flow of the process. One thread consists of multiple threads. consist of.
What is a process
A process is the basic unit of resource (CPU, memory, etc.) allocation, it is a program An instance at execution time.
When the program is running, the system will create a process, allocate resources to it, and then put the process into the process ready queue.
When the process scheduler selects it, it will allocate CPU to it. time, the program starts to actually run.
What is a thread
A thread is the smallest unit of program execution. It is an execution flow of the process and a CPU scheduler. and assigned basic units.
A process can be composed of many threads. All resources of the process are shared between threads. Each thread has its own stack and local variables.
Threads are scheduled and executed independently by the CPU, allowing multiple threads to run simultaneously in a multi-CPU environment. Similarly, multi-threading can also implement concurrent operations, and each request is assigned a thread to process.
The above is the detailed content of What are processes and threads. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1386
52
Explain what the explorer.exe process is
Feb 18, 2024 pm 12:11 PM
What process is explorer.exe? When we use the Windows operating system, we often hear the term "explorer.exe". So, are you curious about what this process is? In this article, we will explain in detail what process explorer.exe is and its functions and effects. First of all, explorer.exe is a key process of the Windows operating system. It is responsible for managing and controlling Windows Explorer (Window
What kind of process is ccsvchst.exe?
Feb 19, 2024 pm 11:33 PM
ccsvchst.exe is a common process file that is part of the Symantec Endpoint Protection (SEP) software, and SEP is an endpoint protection solution developed by the well-known network security company Symantec. As part of the software, ccsvchst.exe is responsible for managing and monitoring SEP-related processes. First, let’s take a look at SymantecEndpointProtection(
How to properly kill zombie processes in Linux
Feb 19, 2024 am 10:40 AM
In Linux systems, zombie processes are special processes that have been terminated but still remain in the system. Although zombie processes do not consume many resources, if there are too many, they may cause system resource exhaustion. This article will introduce how to correctly remove zombie processes to ensure the normal operation of the system. 1Linux zombie process After the child process completes its task, if the parent process does not check the status in time, the child process will become a zombie process. The child process is waiting for confirmation from the parent process, and the system will not recycle it until it is completed. Otherwise, the zombie process will continue to hang in the system. To check whether there are zombie processes in the system, you can run the command top to view all running processes and possible zombie processes. The result of the ‘top’ command can be seen from the figure above in Linux.
Detailed explanation of Linux process priority adjustment method
Mar 15, 2024 am 08:39 AM
Detailed explanation of the Linux process priority adjustment method. In the Linux system, the priority of a process determines its execution order and resource allocation in the system. Reasonably adjusting the priority of the process can improve the performance and efficiency of the system. This article will introduce in detail how to adjust the priority of the process in Linux and provide specific code examples. 1. Overview of process priority In the Linux system, each process has a priority associated with it. The priority range is generally -20 to 19, where -20 represents the highest priority and 19 represents
How to stop Task Manager process updates and kill tasks more easily in Windows 11
Aug 20, 2023 am 11:05 AM
How to Pause Task Manager Process Updates in Windows 11 and Windows 10 Press CTRL+Window Key+Delete to open Task Manager. By default, Task Manager will open the Processes window. As you can see here, all the apps are endlessly moving around and it can be hard to point them down when you want to select them. So, press CTRL and hold it, this will pause the task manager. You can still select apps and even scroll down, but you must hold down the CTRL button at all times.
Why do processes in Linux sleep?
Mar 20, 2024 pm 02:09 PM
Why do processes in Linux sleep? In the Linux operating system, a process can become dormant due to a number of different reasons and conditions. When a process is in a dormant state, it means that the process is temporarily suspended and cannot continue execution until certain conditions are met before it can be awakened to continue execution. Next, we will introduce in detail several common situations when a process enters hibernation in Linux, and illustrate them with specific code examples. Waiting for I/O to complete: When a process initiates an I/O operation (such as reading
C++ Concurrent Programming: How to avoid thread starvation and priority inversion?
May 06, 2024 pm 05:27 PM
To avoid thread starvation, you can use fair locks to ensure fair allocation of resources, or set thread priorities. To solve priority inversion, you can use priority inheritance, which temporarily increases the priority of the thread holding the resource; or use lock promotion, which increases the priority of the thread that needs the resource.
C++ Concurrent Programming: How to do thread termination and cancellation?
May 06, 2024 pm 02:12 PM
Thread termination and cancellation mechanisms in C++ include: Thread termination: std::thread::join() blocks the current thread until the target thread completes execution; std::thread::detach() detaches the target thread from thread management. Thread cancellation: std::thread::request_termination() requests the target thread to terminate execution; std::thread::get_id() obtains the target thread ID and can be used with std::terminate() to immediately terminate the target thread. In actual combat, request_termination() allows the thread to decide the timing of termination, and join() ensures that on the main line