Idea 1
WaitHandle.WaitAny static method returns index of signaled wait handle, so the simplest solution would be to check that index.
Example
static class Program
{
private static Random _random = new Random();
private static AutoResetEvent[] _eventHandles = new[] {new AutoResetEvent(false), new AutoResetEvent(false)};
static void Main()
{
Thread[] threads = new Thread[10];
for (int i = 0; i < threads.Length; i++)
{
threads[i] = new Thread(Method);
threads[i].Start();
var handleIndex = WaitHandle.WaitAny(_eventHandles);
Console.WriteLine(handleIndex == 0 ? "Process1" : "Process2");
}
}
static void Method()
{
if (_random.Next()%2 == 0)
_eventHandles[0].Set();
else
_eventHandles[1].Set();
}
}
Idea 2
You can also use one event handle along with a volatile field that will indicate what conditional statement has been met in order to execute appropriate process after signal.
Example
enum Process
{
Process1,
Process2
}
static class Program
{
private static Random _random = new Random();
private static AutoResetEvent _eventHandle = new AutoResetEvent(false);
private static volatile Process _selectedProcess = Process.Process1;
static void Main()
{
Thread[] threads = new Thread[10];
for (int i = 0; i < threads.Length; i++)
{
threads[i] = new Thread(Method);
threads[i].Start();
_eventHandle.WaitOne();
Console.WriteLine(_selectedProcess == Process.Process1 ? "Process1" : "Process2");
}
}
static void Method()
{
_selectedProcess = _random.Next()%2 == 0 ? Process.Process1 : Process.Process2;
_eventHandle.Set();
}
}
Idea 3
If you are unable to modify external components and you have only event handles, then you may try start new threads for each option and wait there for respective signal in order to perform appropriate operation.
Example
static class Program
{
private static Random _random = new Random();
private static AutoResetEvent[] _eventHandles = new[] {new AutoResetEvent(false), new AutoResetEvent(false)};
static void Main()
{
Thread[] processThreads = new Thread[2];
processThreads[0] = new Thread(Process1);
processThreads[0].Start();
processThreads[1] = new Thread(Process2);
processThreads[1].Start();
Thread[] threads = new Thread[10];
for (int i = 0; i < threads.Length; i++)
{
threads[i] = new Thread(Method);
threads[i].Start();
}
}
static void Method()
{
if (_random.Next()%2 == 0)
_eventHandles[0].Set();
else
_eventHandles[1].Set();
}
static void Process1()
{
while (true)
{
_eventHandles[0].WaitOne();
Console.WriteLine("Process1");
}
}
static void Process2()
{
while (true)
{
_eventHandles[1].WaitOne();
Console.WriteLine("Process2");
}
}
}
Idea 4
If processes require small amount of time, you can use ThreadPool.RegisterWaitForSingleObject Method
Example
static class Program
{
private static Random _random = new Random();
private static AutoResetEvent[] _eventHandles = new[] {new AutoResetEvent(false), new AutoResetEvent(false)};
static void Main()
{
ThreadPool.RegisterWaitForSingleObject(_eventHandles[0], Process1, null, Timeout.Infinite, false);
ThreadPool.RegisterWaitForSingleObject(_eventHandles[1], Process2, null, Timeout.Infinite, false);
Thread[] threads = new Thread[10];
for (int i = 0; i < threads.Length; i++)
{
threads[i] = new Thread(Method);
threads[i].Start();
}
}
static void Method()
{
if (_random.Next()%2 == 0)
_eventHandles[0].Set();
else
_eventHandles[1].Set();
}
static void Process1(object state, bool timedOut)
{
Console.WriteLine("Process1");
}
static void Process2(object state, bool timedOut)
{
Console.WriteLine("Process2");
}
}