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93 lines
2.8 KiB
Python
93 lines
2.8 KiB
Python
"""zmq poll function"""
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# Copyright (C) PyZMQ Developers
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# Distributed under the terms of the Modified BSD License.
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try:
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from time import monotonic
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except ImportError:
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from time import clock as monotonic
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import warnings
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from zmq.error import InterruptedSystemCall, _check_rc
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from ._cffi import ffi
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from ._cffi import lib as C
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def _make_zmq_pollitem(socket, flags):
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zmq_socket = socket._zmq_socket
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zmq_pollitem = ffi.new('zmq_pollitem_t*')
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zmq_pollitem.socket = zmq_socket
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zmq_pollitem.fd = 0
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zmq_pollitem.events = flags
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zmq_pollitem.revents = 0
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return zmq_pollitem[0]
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def _make_zmq_pollitem_fromfd(socket_fd, flags):
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zmq_pollitem = ffi.new('zmq_pollitem_t*')
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zmq_pollitem.socket = ffi.NULL
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zmq_pollitem.fd = socket_fd
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zmq_pollitem.events = flags
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zmq_pollitem.revents = 0
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return zmq_pollitem[0]
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def zmq_poll(sockets, timeout):
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cffi_pollitem_list = []
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low_level_to_socket_obj = {}
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from zmq import Socket
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for item in sockets:
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if isinstance(item[0], Socket):
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low_level_to_socket_obj[item[0]._zmq_socket] = item
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cffi_pollitem_list.append(_make_zmq_pollitem(item[0], item[1]))
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else:
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if not isinstance(item[0], int):
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# not an FD, get it from fileno()
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item = (item[0].fileno(), item[1])
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low_level_to_socket_obj[item[0]] = item
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cffi_pollitem_list.append(_make_zmq_pollitem_fromfd(item[0], item[1]))
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items = ffi.new('zmq_pollitem_t[]', cffi_pollitem_list)
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list_length = ffi.cast('int', len(cffi_pollitem_list))
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while True:
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c_timeout = ffi.cast('long', timeout)
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start = monotonic()
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rc = C.zmq_poll(items, list_length, c_timeout)
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try:
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_check_rc(rc)
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except InterruptedSystemCall:
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if timeout > 0:
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ms_passed = int(1000 * (monotonic() - start))
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if ms_passed < 0:
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# don't allow negative ms_passed,
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# which can happen on old Python versions without time.monotonic.
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warnings.warn(
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f"Negative elapsed time for interrupted poll: {ms_passed}."
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" Did the clock change?",
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RuntimeWarning,
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)
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ms_passed = 0
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timeout = max(0, timeout - ms_passed)
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continue
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else:
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break
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result = []
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for item in items:
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if item.revents > 0:
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if item.socket != ffi.NULL:
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result.append(
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(
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low_level_to_socket_obj[item.socket][0],
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item.revents,
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)
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)
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else:
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result.append((item.fd, item.revents))
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return result
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__all__ = ['zmq_poll']
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