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This article to share with you is about JAVA thread pool C++ thread pool how to achieve, Xiaobian think quite practical, so share to everyone to learn, I hope you can read this article after harvest, not much to say, follow Xiaobian to see it.

What is thread pool?

Thread pool is a thread usage pattern. Too many threads, or frequent thread creation and destruction, introduce scheduling overhead that affects cache locality and overall performance. A thread pool maintains multiple threads waiting for the manager to assign tasks that can be executed concurrently. This avoids the cost of creating and destroying threads while processing short-lived tasks, and ensures thread reusability. Thread pools not only ensure full utilization of the kernel, but also prevent excessive scheduling.

Thread pool implementation

Thread pool in JAVA platform has been mature implementation, this article introduces the Java thread pool implementation of the C++ thread pool class library.

The class library code has been uploaded to github repository, download address: github.com/xiaoba-8/mixthread

The main class relationships in this class library are shown below:

Thread pool class diagram

IRuanble is an interface class, similar to the Runnable interface in JAVA;

DefulatMutext is an access mutex class used to unlock critical resources;

RootThread is a base class for thread implementation, defining common methods in threads;

CommonThread is a simple thread implementation class, similar to the Thread class in JAVA;

DefaultThread class is another thread implementation class. IRunnable can be converted into thread by taking IRunnable as parameter;

ThreadPool is a thread pool implementation class, similar to the ThreadPool class in JAVA.

How to install class libraries

1. Download class library implementation source code: github.com/xiaoba-8/mixthread

2. Go to the class library root folder and execute configure, make, make install in turn

How to use class library

Similar to the use of JAVA thread pool, first create a class that implements the IRunnable interface, and then hand it over to the ThreadPool class instance for scheduling.

The following is an example code:

1. Create a demo_main.cpp file with the following code:

#include #include class DemoThread : public mix::IRunnable{private: int id;public: DemoThread(int id) { this->id = id; } virtual void Run() { for (int i = 0; i

< 3; i++) { usleep(500); printf("Thread %d: loop index %d\n", id, i); } } virtual bool IsDelete () { return true; } virtual int Priority() { return 0; } virtual void SetPriority(int priority) { } virtual void Cancel() { } virtual bool IsCanceled() { return false; } virtual void Pause() {} virtual void Resume() {} virtual bool IsPaused() { return false; } virtual std::string GetTaskId() { return ""; } virtual void TryPause() { }};int main(int argc, char *argv[]){ mix::ThreadPool threadPool(10, 20, 5); printf("Mix Thread Begin\n"); for (int i = 0; i < 5; i++) { threadPool.Execute(new DemoThread(i)); } sleep(1); while (threadPool.GetActiveCount() >

0) { sleep(1); } printf("Mix Thread End\n"); return 0;}

2. Execute the following command to compile, assuming mixthread is installed in/usr/local directory

g++ -I/usr/local/include -g -O2 demo_main.cpp -pthread -o mix_thread_demo -lmixthread -pthread -Wl,-rpath -Wl,/usr/local/lib

Create execution program mix_thread_demo

3. execution result

Implementation of.../ mix_thread_demo, showing the following results

./ mix_thread_demoMix Thread BeginThread 3: loop index 0Thread 4: loop index 0Thread 2: loop index 0Thread 1: loop index 0Thread 0: loop index 0Thread 4: loop index 1Thread 3: loop index 1Thread 2: loop index 1Thread 1: loop index 1Thread 0: loop index 1Thread 4: loop index 2Thread 3: loop index 2Thread 2: loop index 2Thread 1: loop index 2Thread 0: loop index 2Mix Thread End

The above is how to implement the C++ thread pool of JAVA thread pool. Xiaobian believes that some knowledge points may be seen or used in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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