Provides access to preemptive threads.
`spawn` starts a new preemptive thread, and runs $thunk in the thread.
• $thunk must be a fun which takes no arg
This fun returns nada.
Living threads do not prevent the process from exiting, thus they act like Java's daemon threads.
When you spawn a thread, it is automatically detatched from the spawning thread, thus there is no need to join the thread. If you want to block until another thread completes its work, use a concurrency primitive such as MUTEX.
• Invocation of `spawn` happens before invocation of $thunk in the new thread.
`sleep` causes the current thread to sleep for the specified `Seconds`.
`Seconds` must be a non-negative num of arbitrary precision. The maximum precision effective in the result depends on the runtime system. For example, in a Kink runtime system on the JVM, the two invocations of STOPWATCH.start in the following program are equivalent. Both tries to sleep 1234 milliseconds.
:THREAD.require_from('kink/thread/') THREAD.sleep(1.23456) # tries to sleep 1234 milliseconds THREAD.sleep(1.234) # tries to sleep 1234 milliseconds