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Ipcqueue provides POSIX and SYS V message queues functionality to exchange data among processes.

Project description

This package provides SYS V and POSIX message queues to exchange data among processes. Both queues have similar functionality with some differences. Queues are persistent in the kernel unless either queue is closed/unlinked or system is shut down. Unlike multiprocessing.Queue, the same queue can be joined by different processes according to its unique name/key, it’s not necessary to fork main process. Be careful if you use signals in your application, because signal interrupts sending or receiving message.

Installation

Requires Python CFFI, C compiler and Python header files.

cd ipcqueue/
python setup.py install

Usage

>>> from ipcqueue import posixmq
>>> q = posixmq.Queue('/foo')
>>> q.qsize()
0
>>> q.put([1, 'A'], priority=1)
>>> q.put([2, 'B'], priority=2)
>>> q.put([3, 'C'], priority=1)
>>> q.qsize()
3
>>> q.get()
[2, 'B']
>>> q.get()
[1, 'A']
>>> q.get()
[3, 'C']
>>> q.close()
>>> q.unlink()

>>> from ipcqueue import sysvmq
>>> q = sysvmq.Queue(1)
>>> q.qsize()
>>> q.put([1, 'A'], msg_type=1)
>>> q.put([2, 'B'], msg_type=2)
>>> q.put([3, 'C'], msg_type=2)
>>> q.put([4, 'D'], msg_type=1)
>>> q.qsize()
4
>>> q.get(msg_type=2)
[2, 'B']
>>> q.get()
[1, 'A']
>>> q.get()
[3, 'C']
>>> q.get()
[4, 'D']
>>> q.close()

License

3-clause BSD

Project details


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