【day6】多线程

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<time.h>
#include<errno.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<unistd.h>
#include<dirent.h>
#include<pthread.h>

typedef struct 
{
	int len;
	FILE* str;
	FILE* des;
}*filecopy;

void* pthread1(void* args)
{
	filecopy data=(filecopy)args;
	fseek(data->str,0,SEEK_SET);
	fseek(data->des,0,SEEK_SET);
	int i=0;char ch;
	while((ch=fgetc(data->str))!=EOF)
	{
		fputc(ch,data->des);
		i++;
		if(i>(data->len))
		{
			break;
		}
	} 
}

void* pthread2(void* args)
{
	filecopy data=(filecopy)args;
	fseek(data->str,data->len,SEEK_SET);
	fseek(data->des,data->len,SEEK_SET);
	char ch;
	while((ch=fgetc(data->str))!=EOF)
	{
		fputc(ch,data->des);
	}
}


int main(int argc, const char *argv[])
{

	if(argc!=3)
	{
		printf("./a.out <str> <des>");
		return -1;
	}
	filecopy data;
	data->str=fopen(argv[1],"r");
	if(data->str==NULL)
	{
		perror("open error");
		return -1;
	}
	data->des=fopen(argv[2],"w");
	fseek(data->str,0,SEEK_END);
	data->len=ftell(data->str)/2;

	pthread_t tid1,tid2;
	if(pthread_create(&tid1,NULL,pthread1,(void*)data))
	{
		perror("tid1 error");
		return -1;
	}
	if(pthread_create(&tid2,NULL,pthread2,(void*)data))
	{
		perror("tid2 error");
		return -1;
	}

	pthread_join(tid1,NULL);
	pthread_join(tid2,NULL);
	return 0;
}