This class watches for termination of multiple threads. Basic functionality (wait until specified threads have terminated) can be accessed through the class method ThreadsWait::all_waits. Finer control can be gained using instance methods.
Example:
ThreadsWait.all_wait(thr1, thr2, ...) do |t| STDERR.puts "Thread #{t} has terminated." end th = ThreadsWait.new(thread1,...) th.next_wait # next one to be done
Waits until all specified threads have terminated. If a block is provided, it is executed for each thread as they terminate.
# File thwait.rb, line 38
def ThreadsWait.all_waits(*threads) # :yield: thread
tw = ThreadsWait.new(*threads)
if block_given?
tw.all_waits do |th|
yield th
end
else
tw.all_waits
end
end
Creates a ThreadsWait object, specifying the threads to wait on. Non-blocking.
# File thwait.rb, line 53
def initialize(*threads)
@threads = []
@wait_queue = Queue.new
join_nowait(*threads) unless threads.empty?
end
Waits until all of the specified threads are terminated. If a block is supplied for the method, it is executed for each thread termination.
Raises exceptions in the same manner as next_wait.
# File thwait.rb, line 126
def all_waits
until @threads.empty?
th = next_wait
yield th if block_given?
end
end
Returns true if there are no threads in the pool still running.
# File thwait.rb, line 65
def empty?
@threads.empty?
end
Returns true if any thread has terminated and is ready to be collected.
# File thwait.rb, line 72
def finished?
!@wait_queue.empty?
end
Waits for specified threads to terminate, and returns when one of the threads terminated.
# File thwait.rb, line 80
def join(*threads)
join_nowait(*threads)
next_wait
end
Specifies the threads that this object will wait for, but does not actually wait.
# File thwait.rb, line 89
def join_nowait(*threads)
threads.flatten!
@threads.concat threads
for th in threads
Thread.start(th) do |t|
begin
t.join
ensure
@wait_queue.push t
end
end
end
end
Waits until any of the specified threads has terminated, and returns the one that does.
If there is no thread to wait, raises ErrNoWaitingThread. If nonblock is true, and there is no terminated thread, raises ErrNoFinishedThread.
# File thwait.rb, line 110
def next_wait(nonblock = nil)
ThreadsWait.fail ErrNoWaitingThread if @threads.empty?
begin
@threads.delete(th = @wait_queue.pop(nonblock))
th
rescue ThreadError
ThreadsWait.fail ErrNoFinishedThread
end
end