Schyntax.ScheduledTask.RunPendingEvent C# (CSharp) Method

        internal async Task RunPendingEvent(PendingEvent ev)
        {
            var eventTime = ev.ScheduledTime;
            var execLockTaken = false;
            try
            {
                lock (_scheduleLock)
                {
                    if (ev.RunId != _runId)
                        return;

                    // take execution lock
                    execLockTaken = Interlocked.CompareExchange(ref _execLocked, 1, 0) == 0;
                    if (execLockTaken)
                        PrevEvent = eventTime; // set this here while we're still in the schedule lock
                }

                if (execLockTaken)
                {
                    try
                    {
                        if (Callback != null)
                            Callback(this, eventTime);
                        else
                            await AsyncCallback(this, eventTime).ConfigureAwait(false);
                    }
                    catch (Exception ex)
                    {
                        RaiseException(ex);
                    }
                }
            }
            finally
            {
                if (execLockTaken)
                    _execLocked = 0; // release exec lock
            }

            // figure out the next time to run the schedule
            lock (_scheduleLock)
            {
                if (ev.RunId != _runId)
                    return;

                try
                {
                    var next = Schedule.Next();
                    if (next <= eventTime)
                        next = Schedule.Next(eventTime);

                    NextEvent = next;
                    QueueNextEvent();
                }
                catch (Exception ex)
                {
                    _runId++;
                    IsScheduleRunning = false;
                    RaiseException(new ScheduleCrashException("Schtick Schedule has been terminated because the next valid time could not be found.", this, ex));
                }
            }
        }