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1. Basic concepts related to C# multithreading

Process: when a program starts running, it is a process, including the running program and the memory and system resources used by the program. And a process is made up of multiple threads.

Thread: a thread is an execution stream in a program. Each thread has its own proprietary register (stack pointer, program counter, etc.), but the code area is shared, that is, different threads can execute the same function.

Multithreading: multithreading means that a program contains multiple execution streams, that is, multiple different threads can be run simultaneously in a program to perform different tasks, that is, a single program is allowed to create multiple threads of parallel execution to complete their respective tasks.

Static properties: properties that are common to all objects in this class, no matter how many instances of the class you create, but there is only one static property in memory.

Second, the advantages and disadvantages of C# multithreading

Advantages: it can improve the utilization of CPU. In multithreaded programs, when a thread has to wait, CPU can run other threads instead of waiting, which greatly improves the efficiency of the program.

Disadvantages: threads are also programs, so threads need to take up memory, and the more threads, the more memory.

Multithreading needs to be coordinated and managed, so CPU time tracking threads are required.

The access to shared resources between threads will influence each other, so the problem of competing for shared resources must be solved.

Too many threads will lead to too complex control, which may eventually result in a lot of Bug

Classes and methods for controlling threads

Class: using System.Threading; Thread class

The method of the Thread class: Start (): start the thread

Sleep (int): static method that pauses the number of milliseconds specified by the current thread

Abort (): this method is usually used to terminate a thread

Suspend (): this method does not terminate an unfinished thread, it just suspends the thread and can resume later

Resume (): resumes execution of threads suspended by the Suspend () method.

How to manipulate a thread

Using System; using System.Threading; namespace ThreadTest {public class Alpha {public void Beta () {while (true) {Console.WriteLine ("Alpha.Beta is running in its own thread.") } public class Simple {public static int Main () {Console.WriteLine ("Thread Start/Stop/Join Sample"); Alpha oAlpha = new Alpha () / / create a thread to execute the Beta () method of the Alpha class Thread oThread = new Thread (new ThreadStart (oAlpha.Beta)); oThread.Start (); / / the program runs the Alpha.Beta () method while (! oThread.IsAlive) Thread.Sleep (1) / / stop the main thread from 1ms oThread.Abort (); / / terminate the thread oThread oThread.Join (); / / make the main thread wait until the oThread thread ends. You can specify an int parameter as the maximum waiting time Console.WriteLine (); Console.WriteLine ("Alpha.Beta has finished"); try {Console.WriteLine ("Try to restart the Alpha.Beta thread"); oThread.Start () } catch (ThreadStateException) {Console.Write ("ThreadStateException trying to restart Alpha.Beta. ); Console.WriteLine ("Expected since aborted threads cannot be restarted."); Console.ReadLine ();} return 0;}

5. Thread.ThreadState attribute

Aborted: thread stopped

AbortRequested: the thread's Thread.Abort () method has been called, but the thread has not stopped

Background: thread executes in the background, related to the attribute Thread.IsBackground; does not prevent the termination of the program

Running: thread is running normally

Stopped: thread has been stopped

StopRequested: the thread is being asked to stop

Suspended: the thread has been suspended (in this state, you can rerun it by calling the Resume () method)

SuspendRequested: the thread is requesting to be suspended, but there is no time to respond

Unstarted: Thread.Start () is not called to start running the thread

WaitSleepJoin: the thread is blocked because it calls methods such as Wait (), Sleep () or Join ().

VI. Priority of C# multithreading

From high to low, the Highest,AboveNormal,Normal,BelowNormal,Lowest; system defaults to ThreadPriority.Normal

Code that specifies the priority: myThread.Priority=ThreadPriority.Lowest

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