如何创建可变数量的线程? [英] How can I create a variable number of threads?

问题描述

我正在尝试创建一个程序，该程序将对全局变量进行加减.加法和减法功能将由线程处理.如何持续加/减，直到全局变量达到某个阈值?

I am trying to create a program that will add and subtract from a global variable. The add and subtract features will be handled by threads. How do I continuously add/subtract until the global variable has reached some threshold?

我目前创建了2个线程，一个用于加法，另一个用于减法.但是我的程序每次只会对全局变量加减一次. 我认为我应该创建一个动态线程数组，该数组将不断增长，直到acctBalance达到一定数量为止.我将如何实现这一目标?

I currently have created 2 threads, 1 for adding, another for subtracting. But my program will only add and subtract from the global variable one time each. I figure I should create a dynamic array of threads that will grow until the acctBalance reaches some number. How would I go about accomplishing this?

推荐答案

这里没有什么复杂的事情，只需创建一个向量并向其中添加线程即可.

There isn't anything complicated here, just create a vector and add threads to it:

std::vector<std::thread> threads;
threads.reserve(count);
for (size_t i = 0; i < count; i++)
{
  threads.emplace_back(Add, 0, 15,rand);
}
for (auto& thread : threads)
{
  thread.join();
}

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