One of C language multithreading programming

stay C You can use pthread.h Of API To create threads ,pthread.h accord with POSIX standard , Means that you can Unix and Linux Run under ,Windows NT It also provides corresponding support

Create multithreading ：

#include<stdio.h>
#include<pthread.h>

void *thread_func(void *args)
{
	printf("This is thread_func");
	return 0;
}

int main()
{
	pthread_t thread;
	if(pthread_create(&thread,NULL,thread_func,NULL))
	{
		printf("creat thread fail\n");
	}
	else
	{
		printf("creat thread successfull\n"); 
	}
	pthread_exit(NULL);
}

About pthread_create function , When successful, the return is 0, When you fail, you return 1

The first parameter is a pointer to the thread identifier

The second parameter is thread property

The third parameter is the starting address of the function

The fourth parameter is the parameter of the running function , With the fourth parameter, you can pass parameters into the function when creating a thread

Pass parameters into the created thread ：

#include<stdio.h>
#include<pthread.h>

void *thread_func(void *parameter)
{
	printf("This is thread_func,parameter:%s",parameter);
	return 0;
}

int main()
{
	pthread_t thread;
	char* parameter="ok";
	if(pthread_create(&thread,NULL,thread_func,(void *)parameter))
	{
		printf("creat thread fail\n");
	}
	else
	{
		printf("creat thread successfull\n"); 
	}
	pthread_exit(NULL);
}

Creating a thread pool （ Pass in parameters when creating ）：

#include<stdio.h>
#include<pthread.h>

#define THREAD_NUM 5

void *thread_func(void *parameter)
{
	printf("This is thread_func,parameter:%d\n",parameter);
	return 0;
}

int main()
{
	pthread_t threads[THREAD_NUM];
	for(int i=0;i<THREAD_NUM;i++)
	{
		if(pthread_create(&threads[i],NULL,thread_func,(void*)i))
		{
			printf("creat thread fail\n");
		}
		else
		{
			printf("creat thread successfull\n"); 
		}
	
	}
	pthread_exit(NULL);
}