thwait.rb - thread synchronization class
$Release Version: 0.9 $
$Revision: 1.3 $
$Date: 1998/06/26 03:19:34 $
by Keiju ISHITSUKA(Nihpon Rational Software Co.,Ltd.)

-- feature: provides synchronization for multiple threads.

class methods:

• ThreadsWait.all_waits(thread1,...) waits until all of specified threads are terminated. if a block is supplied for the method, evaluates it for each thread termination.
• th = ThreadsWait.new(thread1,...) creates synchronization object, specifying thread(s) to wait.

methods:

• th.threads list threads to be synchronized
• th.empty? is there any thread to be synchronized.
• th.finished? is there already terminated thread.
• th.join(thread1,...) wait for specified thread(s).
• th.join_nowait(threa1,...) specifies thread(s) to wait. non-blocking.
• th.next_wait waits until any of specified threads is terminated.
• th.all_waits waits until all of specified threads are terminated. if a block is supplied for the method, evaluates it for each thread termination.