Amnesia.SessionTracker.Pause C# (CSharp) Method

        private void Pause(int timeoutMS, ILog log)
        {
            // Ensure only a single thread owns the pause lock.
            Monitor.Enter(pauseLock);

            try
            {
                // At this point the current thread has been granted the pauseLock and can start blocking future activities as well as
                // wait for any current activities to complete.

                lock (fieldsLock)
                {
                    // stop future activities from starting
                    paused = true;

                    // Wait for any activities that are currently executing to complete
                    int freeActivities = (CurrentThreadActivity != null ? 1 : 0);

                    if (activityCount > freeActivities)
                    {
                        // Let other threads know we're interested in knowing when we're idle and wait
                        activitiesDone = new AutoResetEvent(false);

                        // Take into account that the lock request may be occuring either from an existing activity
                        pendingActivities = activityCount - freeActivities;
                    }
                }

                // Wait for other request threads to complete
                if (activitiesDone != null)
                {
                    log.Write("Waiting for other amnesia activities to complete...");

                    bool signalReceived = activitiesDone.WaitOne(timeoutMS);
                    activitiesDone = null;

                    if(signalReceived)
                        log.Write("Other amnesia activities completed successfully.");
                    else
                        log.Write(string.Format("WARNING: Timeout ({0} milliseconds) reached while waiting for other amnesia activities to complete.", timeoutMS));
                }

                // Hold the pauseLock open until Resume()
            }
            catch (Exception)
            {
                // An unexpected error occurred so release the pauseLock
                Resume();
                throw;
            }
        }