创建10个线程创建1.txt - 10.txt,然后合并到data.txt，不需要创建线程11_把拦截数据输出到txt 需要创建线程吗-优快云博客

本文介绍了一个使用多线程技术实现的文件合并程序。该程序通过创建多个线程来生成并读取一系列文本文件，然后将这些文件的内容按顺序合并到一个主文件中。程序利用了信号量和条件变量来同步线程操作，并确保了数据的一致性和完整性。

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#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <unistd.h>
#include <fcntl.h>

int counter = 0;
int sig = 1,fdx = -1;
#define MAXNUMBER  10

pthread_mutex_t counter_mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t counter_cond = PTHREAD_COND_INITIALIZER;

void *creat_file(void *arg)
{
	char buf[100] = {0};
	int j = 0,n = 0;
	int p = (int)arg;
	snprintf(buf,sizeof(buf),"%d.txt",p);
	int fd = open(buf,O_RDWR | O_TRUNC | O_CREAT,0644);
	if(fd < 0)
	{
		perror("Open");
		exit(EXIT_FAILURE);
	}
	for(j = (p - 1) * 10; j <= (p) * 10; j++)
	{
		snprintf(buf,sizeof(buf),"%03d ",j);
		write(fd,buf,strlen(buf));
	}
	close(fd);
	
	snprintf(buf,sizeof(buf),"%d.txt",p);
	fd = open(buf,O_RDONLY);
	printf("p = %d\n",p);
	printf("fd = %d\n",fd);
	pthread_mutex_lock(&counter_mutex);
	while(sig < p)
	{
		pthread_cond_wait(&counter_cond,&counter_mutex);
	}
	//printf("---------------------------------\n");
	while(n = read(fd,buf,sizeof(buf)))
		write(fdx,buf,n);
	write(fdx,"\n",1);
	sig++;
	printf("sig = %d\n",sig);
	pthread_mutex_unlock(&counter_mutex);
	pthread_cond_broadcast(&counter_cond);//广播给所有线程
	//pthread_cond_signal(&counter_cond);//给随机的线程
}

int main(void)
{
	int i;
	void *tret = NULL;
	pthread_t tid[MAXNUMBER],merge_tid;
	
	fdx = open("data.txt",O_RDWR | O_TRUNC | O_CREAT,0644);
	
	for(i = 0; i < MAXNUMBER; i++)
	{
		counter = i + 1;
		pthread_create(&tid[i],NULL,creat_file,(void *)counter);
	}
	
	//printf("*****************************************\n");
	
	for(i = 0; i < MAXNUMBER; i++)
	{
		pthread_join(tid[i],NULL);
	}
	
	return 0;
}