Linux下多线程复制文件（C）

Linux下实现多线程文件复制，使用<pthread.h>提供的函数：

　　int pthread_create(pthread_t *thread,const pthread_attr_t *restrict attr,void* (*start_routine)(void*),void *restrict arg)，创建线程，

　　int pthread_join(pthread_t thread,void **value_ptr)，回收子线程

　　子线程负责文件复制

void* doThread(void *arg)
{
    Info* info = (Info*)arg;

    unsigned long int per = getSize(info->fromFile)/maxThread;

    FILE* fin = fopen(info->fromFile,"r");
    FILE* fout = fopen(info->toFile,"w+");

    fseek(fin,info->num*per,SEEK_SET);
    fseek(fout,info->num*per,SEEK_SET);

    char buf[4096] = {0};
    int n;
    int sum = 0;
    while((n = fread(buf,1,sizeof(buf),fin)) > 0)
    {
        fwrite(buf,1,n,fout);
        if(info->num == (maxThread-1))
            cout<<"sum = "<<sum<<" per = "<<per<<endl;
        sum += n;
        if(sum > per)
            break;
        memset(buf,0,sizeof(buf));
    }

    fclose(fin);
    fclose(fout);

    return NULL;
}

其中struct Info结构原型

struct Info
{
    char* fromFile;     //源文件
    char* toFile;       //目标文件
    int num;            //第几个线程
};

完整代码详见GitHub地址：https://github.com/MasterMeng/mult_pthread_copy