source: doc/papers/concurrency/examples/ProdCons.py@ d06707e

def Prod( N ):
        cons = yield                            # get cons
        yield                                           # resume scheduler
        for i in range( N ):
                print( "prod" )
                yield cons                              # execute next
        print( "end", "prod" )

def Cons( N ):
        prod = yield                            # get prod
        yield                                           # resume scheduler
        for i in range( N ):
                print( "cons" )
                yield prod                              # execute next
        print( "end", "cons" )

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

prod = Prod( 5 )
cons = Cons( 5 )
next( prod )                                    # prime
prod.send( cons )                               # send cons
next( cons )                                    # prime
cons.send( prod )                               # send prod

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

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