source: doc/papers/concurrency/examples/Pingpong.py@ bad9c8f

def PingPong( name, N ):
        partner = yield                         # get partner
        yield                                           # resume scheduler
        for i in range( N ):
                print( name )
                yield partner                   # execute next
        print( "end", name )

def Scheduler():
        n = yield                                       # starting coroutine
        try:
                while True:
                        n = next( n )           # schedule coroutine
        except StopIteration:
                pass

pi = PingPong( "ping", 5 )
po = PingPong( "pong", 5 )
next( pi )                                              # prime
pi.send( po )                                   # send partner
next( po )                                              # prime
po.send( pi )                                   # send partner

s = Scheduler();
next( s )                                               # prime
try:
        s.send( pi )                            # start cycle
except StopIteration:                   # scheduler stopped
        pass
print( "stop" )

# Local Variables: #
# tab-width: 4 #
# compile-command: "python3.7 Pingpong.py" #
# End: #