内存锁定以确保共享数据可以被多个线程读取，但只能被一个线程写入? [英] Memory lock to ensure shared data can be read from by many threads, but only written to by one?
问题描述
我正在尝试编写一个C#程序，其中对照线程中的特定值 x 检查列表 A 中的值.我希望线程将它们的 x 值与列表中的每个值进行比较，如果找不到，我希望它们将其值 x 添加到 A .然后，线程将从其私有内存中的列表中获得新的 x ，并再次开始将其与 A 中的值进行比较.该程序的目的是使 A 成为唯一值列表，并在线程中包含列表的所有值.
I am trying to write a C# program where values in a list A are checked against a particular value x in a thread. I would like the threads to compare their x values to each of the ones in the list, and if it is not found, I would like them to add their value x to A. The thread will then get a new x from a list in it's private memory, and begin comparing it to the values in A again. The objective of this program is to make A a list of unique values, and contain all of the values of the lists in the threads.
我想知道C#是否具有某些本机读/写锁，该锁将允许从单个列表中读取尽可能多的线程，但是一旦开始写，我希望所有其他线程在尝试之前等待再次从列表中读取.
I'm wondering if C# has some native read/write lock that will allow as many threads to read from a single list as possible, but once one starts to write, I would like all of the other threads to wait before attempting to read from the list again.
还有，有没有一种方法可以确保多个线程不会同时尝试写入?如果2个以上的线程包含相同的 x 值并尝试同时获取写锁，然后将相同的值一个接一个地添加到列表中，我会看到一个问题.
Also, is there a way I could ensure multiple threads won't attempt to write at the same time? I could see this being an issue if 2+ threads contained the same x value and tried to gain the write lock simultaneously - then added the same value to the list one after another.
推荐答案
我想知道C#是否具有某些本机读/写锁，该锁将允许从单个列表中读取尽可能多的线程
I'm wondering if C# has some native read/write lock that will allow as many threads to read from a single list as possible
是，请使用读取器写入器锁.这就是它的设计目的.
Yes, use a Reader Writer Lock. That's what it's designed for.
.net ReaderWriterLock和ReaderWriterLockSlim中分别有两个版本的ReaderWriterLock.后者是首选，因为它很有效.
There are two versions of ReaderWriterLock in .net ReaderWriterLock and ReaderWriterLockSlim respectively. Latter one is preferred as it is efficient.
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