One option would be to create a named EventWaitHandle. This creates a synchronization object that you can use across processes. Then you have your 'client' applications wait until the event is signalled before proceeding. Once the main console application has completed the startup it can signal the event.
http://msdn.microsoft.com/en-us/library/41acw8ct(VS.80).aspx
As an example, your "Server" console application might have the following. This is not compiled so it is just a starting point :)
using System.Threading;
static EventWaitHandle _startedEvent;
static void main()
{
_startedEvent = new EventWaitHandle(false, EventResetMode.ManualReset, @"GlobalConServerStarted");
DoLongRunnningInitialization();
// Signal the event so that all the waiting clients can proceed
_startedEvent.Set();
}
The clients would then be doing something like this
using System.Threading;
static void main()
{
EventWaitHandle startedEvent = new EventWaitHandle(false, EventResetMode.ManualReset, @"GlobalConServerStarted");
// Wait for the event to be signaled, if it is already signalled then this will fall throught immediately.
startedEvent.WaitOne();
// ... continue communicating with the server console app now ...
}
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