CODEWITHSUNDEEP
c#multithreadingasynchronous
Mark Segal
Mark Segal

Reputation: 5560

How to wait until a method is started & finished?

I have method A that runs on thread #1.

I also have method B that runs on thread #2.

Method A writes to a shared object a function C (method that receives an object value and returns a Boolean value) that should be executed on some event via method B. (method B is a TCP listener method that runs forever)

I wish that method A will wait until that event occurs AND the C is finished. Currently its implemented with a Sleep based for loop (with timeout and such).

Let me make myself more clear, the flow is like this:

Method B (on thread #2): while(true) { process data, if data has x then someFunc(..) }

Method A (on thread #1): someFunc = (obj) => {...}; wait until someFunc is executed by B & is finished; do more stuff

Whats the smartest way of achieving this?

Upvotes: 0

Views: 699

Answers (2)

Sriram Sakthivel
Sriram Sakthivel

Reputation: 73502

Use AutoResetEvent or ManualResetEvent

private AutoResetEvent signal = new AutoResetEvent(false);
void MethodB()
{
   //process data
   if(condition)
   {
       signal.Set();//Say you're finished
   }
}

void MethodA()
{
    //Do something

    signal.WaitOne();//Wait for the signal
    //Here do whatever you want. We received signal from MethodB
}

I recommend reading http://www.albahari.com/threading/

Upvotes: 3

Udontknow
Udontknow

Reputation: 1580

Use a lock and the Monitor class.

private object _lock = new object();
...
private void StartTaskAndWait()
{
   lock (_lock)
   {
      new Task(DoSomething).Start();
      Monitor.Wait()
   }
}

Use Pulse at the end of the task method to "wake up" the waiting thread.

lock (_lock)
{
   Monitor.Pulse(_lock);
}

Upvotes: 1

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