Package for using processes mimicking the `threading` module
Project description
processing is a package for the Python language which supports the spawning of processes using the API of the standard library’s threading module. It runs on both Unix and Windows.
Objects can be transferred between processes using pipes or queues, and objects can be shared between processes using a server process or (for simple data) shared memory. Equivalents of the synchronization primitives in threading are also provided.
Links
The package can be downloaded from
Examples
The processing.Process class follows the API of threading.Thread. For example
from processing import Process, Queue
def f(q):
q.put('hello world')
if __name__ == '__main__':
q = Queue()
p = Process(target=f, args=[q])
p.start()
print q.get()
p.join()
Synchronization primitives like locks, semaphores and conditions are available, for example
>>> from processing import Condition >>> c = Condition() >>> print c <Condition(<RLock(None, 0)>), 0> >>> c.acquire() True >>> print c <Condition(<RLock(MainProcess, 1)>), 0>
One can also use a manager to create shared objects either in shared memory or in a server process, for example
>>> from processing import Manager >>> manager = Manager() >>> l = manager.list(range(10)) >>> l.reverse() >>> print l [9, 8, 7, 6, 5, 4, 3, 2, 1, 0] >>> print repr(l) <Proxy[list] object at 0x00E1B3B0>
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