How Create a Scheduler (e.g. to schedule tweets, or an api request)

Question

I have a table of schedule items, they may be scheduled for the same time. I\'m wondering how to have them all execute at the correct time when:

The problem I see is

Answer 1

Unless you take steps to take advantage of the asynchronous APIs that exist for all IO operations, your only approach is to use many threads. Consider the .net ThreadPool as this can increase the number of threads when too many work items are queued. There will be a limit here, as the ThreadPool spins up extra threads relatively slowly. Under sustained overload, your system will groan. Like I said, the best way to approach this is with asynchronous IO.