For most applications one should use
Pipe instead of Stream.
Clock includes functions to create deferreds that become determined at a certain time.
RECORD_ASYNC_BACKTRACES is set, the Async scheduler records a backtrace
everytime it schedules a job, and will include the backtrace history in any exceptions
raised to monitors, and in particular, in an unhandled exception that reaches the main
A deferred is a value that will become determined asynchronously.
Events is for keeping a set of events that need to happen in the future.
A handler is a continuation that captures the current async execution context.
An ivar is a write-once cell that can be empty or full (i.e.
length t returns the number of waiting jobs
A monitor is a context that determines what to do when there is an unhandled exception.
A pipe is a buffered FIFO communication channel.
A tail is a pointer to the end of a stream that can be used to extend the stream.
Throttles for simultaneous computations.