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In certain kinds of applications, it is possible to implement cooperative user-space multithreading using a task scheduler and a collection of generators or coroutinesThis is sometimes called microthreading, although the terminology varies sometimes this is described in the context of tasklets, green threads, greenlets, etc A common use of this technique is in programs that need to manage a large collection of open files or sockets For example, a network server that wants to simultaneously manage 1,000 client connections Instead of creating 1,000 threads to do that, asynchronous I/O or polling (using the select module) is used in conjunction with a task scheduler that processes I/O events
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The underlying concept that drives this programming technique is the fact that the
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yield statement in a generator or coroutine function suspends the execution of the function until it is later resumed with a next() or send() operationThis makes it
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possible to cooperatively multitask between a set of generator functions using a scheduler loop Here is an example that illustrates the idea:
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def foo(): for n in xrange(5): print("I'm foo %d" % n) yield def bar(): for n in xrange(10): print("I'm bar %d" % n) yield def spam(): for n in xrange(7): print("I'm spam %d" % n) yield # Create and populate a task queue from collections import deque taskqueue = deque() taskqueueappend(foo()) # Add some tasks (generators) taskqueueappend(bar()) taskqueueappend(spam()) # Run all of the tasks while taskqueue: # Get the next task task = taskqueuepop() try: # Run it to the next yield and enqueue next(task) taskqueueappendleft(task) except StopIteration: # Task is done pass
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It is uncommon for a program to define a series of CPU-bound coroutines and schedule them as shown Instead, you are more likely to see this technique used with I/O bound tasks, polling, or event handling An advanced example showing this technique is found in the select module section of 21, Network Programming and Sockets
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his chapter describes the modules used to implement low-level network servers and clients Python provides extensive network support, ranging from programming directly with sockets to working with high-level application protocols such as HTTPTo begin, a very brief (and admittedly terse) introduction to network programming is presented Readers are advised to consult a book such as UNIX Network Programming,Volume 1: Networking APIs: Sockets and XTI by W Richard Stevens (Prentice Hall, 1997, ISBN 0-13-490012-X) for many of the advanced details 22, Internet Application Programming, describes modules related to application-level protocols
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Python s network programming modules primarily support two Internet protocols:TCP and UDPThe TCP protocol is a reliable connection-oriented protocol used to establish a two-way communications stream between machines UDP is a lower-level packet-based protocol (connectionless) in which machines send and receive discrete packets of information without formally establishing a connection Unlike TCP, UDP communication is unreliable and thus inherently more complicated to manage in applications that require reliable communications Consequently, most Internet applications utilize TCP connections Both network protocols are handled through a programming abstraction known as a socket A socket is an object similar to a file that allows a program to accept incoming connections, make outgoing connections, and send and receive data Before two machines can communicate, both must create a socket object The machine receiving the connection (the server) must bind its socket object to a known port number A port is a 16-bit number in the range 0 65535 that s managed by the operating system and used by clients to uniquely identify servers Ports 0 1023 are reserved by the system and used by common network protocolsThe following table shows the port assignments for a couple of common protocols (a more complete list can be found at http://wwwianaorg/assignments/port-numbers):
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