Locks in Single-Process Applications
In a single-machine environment, we can use thread locks to solve concurrency problems. In a distributed system, however, thread locks cannot solve concurrency problems, because a thread lock in a distributed system can only lock the current process, not other processes.
In .NET, we can use the lock keyword to implement a thread lock.
https://learn.microsoft.com/zh-cn/dotnet/csharp/language-reference/statements/lock
private static readonly object _lock = new object();
public void DoSomething()
{
lock (_lock)
{
// Business logic
}
}
C# 13 introduces a new thread synchronization type, System.Threading.Lock, which simplifies lock usage through scope management, making the code clearer and more reliable.
using System.Threading.Lock;
private static readonly Lock _lock = new Lock();
public void DoSomething()
{
using (_lock.EnterScope())
{
// Business logic
}
}
Open-Source Distributed Lock Implementations
DistributedLock is a .NET library that provides strong, easy-to-use distributed mutexes, reader-writer locks, and semaphores built on a variety of underlying technologies.
https://github.com/madelson/DistributedLock
Distributed Locks in the Zero Framework
The Zero Framework provides a basic abstraction for distributed locks and implements a distributed lock based on Dapr.
How the Redis Distributed Lock Works
The Redis distributed lock is implemented with the SETNX command. SETNX is an atomic Redis operation that sets a key’s value only if the key does not exist; if the key already exists, it does nothing.