个人中心
gpt4 book ai didi

c++ - 多线程程序中的核心转储:basic_string::_S_construct null 无效

转载 作者：行者123 更新时间：2023-11-28 03:17:38 25 4
gpt4 key购买 nike

<分区>

我希望 4 个线程进入同一个名为 read 的函数，并执行函数中的操作(读取，然后在监视器上打印，并显示所有内容.. .).问题:

terminate called after throwing an instance of 'std::logic_error'
  what():  basic_string::_S_construct null not valid
trAborted (core dumped)

代码是:

#include <pthread.h>
#include <unistd.h>
#include <stdio.h>
#include <iostream>
#include <time.h>
#include <cstdlib>
#include <fstream>
#include <string>
using namespace std;

struct v {
    int id;
    char* ad;

    v(int a, char* t) {
        id = a;
        ad = t;
    }
};

int bank = 1000;
pthread_mutex_t mutex;

void* read(void* argument)
{
    cout << "tr";
    v* d;
    int num;
    d = (v*) argument;
    string l = d->ad;
    int n = d->id;
    string x = "";
    ifstream textfile;
    textfile.open(l.c_str());
    while (!textfile.eof()) {
        textfile >> x;
        if (x == "SUB") {
            pthread_mutex_lock(&mutex);
            textfile >> num;
            bank = bank - num;
            cout << "person num " << n << " sub " << num << " dollars and know in the Bank: " << bank << endl;
            pthread_mutex_unlock(&mutex);
        }
        if (x == "ADD") {
            pthread_mutex_lock(&mutex);
            textfile >> num;
            bank = bank + num;
            cout << "person num " << n << " add " << num << " dollars and know in the Bank: " << bank << endl;
            pthread_mutex_unlock(&mutex);
        }
        if (x == "GET") {
            pthread_mutex_lock(&mutex);
            cout << "person num " << n << " look in the Bank: " << bank << endl;
            pthread_mutex_unlock(&mutex);
        }


    }
    textfile.close();
    return 0;
}

int main(void)
{
    pthread_mutex_init(&mutex, NULL);
    int i = 0, j = 0;
    v data1(1, "file1.dat"), data2(2, "file2.dat"), data3(3, "file3.dat"), data4(4, "file4.dat");
    pthread_t t1, t2, t3, t4;
    i = pthread_create(&t1, NULL, read, (void*)&data1);
    if (i != 0) cout << "error" ;
    j = pthread_create(&t2, NULL, read, (void*)&data2);
    if (j != 0) cout << "error" ;
    i = pthread_create(&t3, NULL, read, (void*)&data3);
    if (i != 0) cout << "error" ;
    j = pthread_create(&t4, NULL, read, (void*)&data4);
    if (j != 0) cout << "error" ;

    pthread_exit(NULL);

    return 0;
}

25 4 0
文章推荐： javascript - 带有光标 Javascript 的自动打字机
文章推荐： 用于扫描二维码移动浏览器的Javascript库
文章推荐： css - 背景图像不会加载图像 Ruby on Rails
文章推荐： javascript - QZ 托盘输出打印条码质量低
行者123
个人简介

我是一名优秀的程序员,十分优秀！

滴滴打车优惠券免费领取
滴滴打车优惠券
全站热门文章
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com