/// <summary>
/// Get the mutex for a given mutexId
/// </summary>
/// <param name="mutexId"></param>
public void AcquireMutex(int mutexId)
{
Mutex mutex = null;
// Create a mutex for this mutexId, and immediately own it
lock (_mutexes)
{
// No mutex for this mutex id yet
if (!_mutexes.SafeContainsKey(mutexId))
{
_mutexes.SafeAdd(mutexId, new Mutex(true));
return;
}
// More complicated.
//
// There is already a mutex for this id.
//
// Wait on the mutex, and then try adding again. But we MUST wait
// on the mutex OUTSIDE of this lock, otherwise we hold up all
// other acquires
mutex = _mutexes[mutexId];
}
// Wait on the mutex now, but then release immediately, we don't need
// it. Just need to know once the other acquire has finished.
try
{
mutex.WaitOne();
mutex.ReleaseMutex();
}
catch (ObjectDisposedException)
{
// Ignore this. Happens if we Close the mutex elsewhere
// before we get chance to release it here. Its not a problem.
// Either way we no longer have the mutex;
}
// Go back and try to get the mutex again. We can't just take it
// incase others are waiting
AcquireMutex(mutexId);
}