C#•3mo ago

Question regarding thread safety

Is it safe to call code on the foo object from multiple threads in this scenario? Like what happens if two threads try to access the foo object to call DoSomething() on instanceA at the same time?

static void Main()
    {
        var foo = new Foo();
        foo.instanceA = new Bar();
        foo.instanceB = new Bar();
        
        //Assuming every method on Bar is thread safe is it safe to access the foo object to call a method on Bar from any thread?
                foo.instanceA.DoSomething();
                
        
    }
    public class Foo
    {
        public Bar instanceA;
        public Bar instanceB;
    }
    
    public class Bar
    {
        public void DoSomething()
        {
            
        }
    }

static void Main()
    {
        var foo = new Foo();
        foo.instanceA = new Bar();
        foo.instanceB = new Bar();
        
        //Assuming every method on Bar is thread safe is it safe to access the foo object to call a method on Bar from any thread?
                foo.instanceA.DoSomething();
                
        
    }
    public class Foo
    {
        public Bar instanceA;
        public Bar instanceB;
    }
    
    public class Bar
    {
        public void DoSomething()
        {
            
        }
    }

7 Replies

Izagawd•3mo ago

it will still execute from multiple threads, i believe. if there are parts of the method you dont want to be executed in multiple threads, you can use lock

kurumi•3mo ago

it is safe unless you don't use shared data (in case if both threads used it for reading, it's fine)

ChezZ•3mo ago

Could you elaborate a little what you mean? I know the code going on in DoSomething is thread safe im just worried if the foo object is going to cause any issues executing it

kurumi•3mo ago

I mean that executing DoSomething is thread safe it doesn't matter in which instance it's called. Unless you have shared state that any thread can interrupt

ChezZ•3mo ago

so if i was to spin up two threads i could call foo.instanceA.DoSomething() from both the threads?

kurumi•3mo ago

yes, you can

ChezZ•3mo ago

Alright thank you very much so I guess calling a method on object references is just a read operation?

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Question regarding thread safety