C#•2y ago

✅ Mutexing List

I have a service that spawns a thread to execute functions, and the list being access inside the spawned thread is inside of another thread. how do i mutex a list between 2 threads?

15 Replies

boom•2y ago

basically, the spawned threads are going to remove themselves from the list, but i feel there will be a mutex issue removing the items from the list if they finish at odd times

333fred•2y ago

You don't mutex a list, you use a synchronization primitive (such as a mutex) to synchronize the threads

boom•2y ago

so, basically create a bool that locks the access to removing/adding items from the list

333fred•2y ago

And it's not hard. As an example:

class MyClass
{
    private readonly List<string> list = new();
    private readonly object listLock = new();
    public void M()
    {
        lock (listLock) { /* Do things on the list */ }
    }
}

class MyClass
{
    private readonly List<string> list = new();
    private readonly object listLock = new();
    public void M()
    {
        lock (listLock) { /* Do things on the list */ }
    }
}

Not a bool, a lock

boom•2y ago

oooo i see

333fred•2y ago

A boolean field is not a sufficient synchronization primitive on its own

boom•2y ago

good information, appreciated. i will give this a go

333fred•2y ago

https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/statements/lock is the reference for lock

lock statement - synchronize thread access to a shared resource

Use the C# lock statement to ensure that only a single thread exclusively reads or writes a shared resource, blocking all other threads until it completes.

333fred•2y ago

There's a lot more to learn when it comes to synchronization, but this is the basic version

boom•2y ago

this is a little bit more than i thought it'd be xd

333fred•2y ago

Synchronization always is

boom•2y ago

then again, the threads i was working with weren't real threads python 🤢 i'll study this to my needs, thanks

333fred•2y ago

If you don't have any other questions, consider $close ing the thread

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Accord•2y ago

Closed!

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✅ Mutexing List