LInux下Posix的傳統線程示例

簡介

Linux線程是需要連接pthreat庫，線程的使用比進程更靈活，需要注意的是線程間的互斥，或者說是資源共享問題。
C++11之後，C++標準庫也引入了線程，並且使用非常方便，以後再介紹，這裏先發一個簡單的線程示例代碼。

代碼

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


char message[32]={"Hello world!"};
void *thread_function(void *arg);


void *thread_function(void *arg)
{
    printf("thread_fonction is runing , argument is %s\n", (char *)arg);
    strcpy(message, "marked by thread");

    printf("thread_function finished\n");
    pthread_exit("Thank you for the cpu time\n");	
}


int
main(int argc, char **argv)
{   
    pthread_t a_thread;
    void *thread_result;

    if(pthread_create(&a_thread, NULL, thread_function, (void*)message ) < 0)
	{
		perror("pthread_create error:");
		exit(-1);
	}
	
    printf("writing for the thread to finish\n");
    if(pthread_join(a_thread, &thread_result) < 0)
    {
        perror("pthread_join error:");
        exit(0);
    }

    printf("in main, thread is exist, marked msg: %s \n", message);

    exit(0);
}

編譯

編譯的時候，需要加上pthread線程庫

gcc pthreat.c -o test -lpthread

運行

程序啓動後，主程序中，創建線程，然後等待線程退出，在線程函數裏，會把message字符串修改掉。

./test 
in main, writing for the thread to finish
in thread, thread_fonction is runing , argument is Hello world!
in thread, thread_function finished
in main, thread is exist, marked msg: marked by thread 

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