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"""zmq Context class"""
# Copyright (C) PyZMQ Developers
# Distributed under the terms of the Modified BSD License.
from zmq.constants import EINVAL, IO_THREADS
from zmq.error import InterruptedSystemCall, ZMQError, _check_rc
from ._cffi import ffi
from ._cffi import lib as C
class Context:
_zmq_ctx = None
_iothreads = None
_closed = True
_shadow = False
def __init__(self, io_threads=1, shadow=None):
if shadow:
self._zmq_ctx = ffi.cast("void *", shadow)
self._shadow = True
else:
self._shadow = False
if not io_threads >= 0:
raise ZMQError(EINVAL)
self._zmq_ctx = C.zmq_ctx_new()
if self._zmq_ctx == ffi.NULL:
raise ZMQError(C.zmq_errno())
if not shadow:
C.zmq_ctx_set(self._zmq_ctx, IO_THREADS, io_threads)
self._closed = False
@property
def underlying(self):
"""The address of the underlying libzmq context"""
return int(ffi.cast('size_t', self._zmq_ctx))
@property
def closed(self):
return self._closed
def set(self, option, value):
"""set a context option
see zmq_ctx_set
"""
rc = C.zmq_ctx_set(self._zmq_ctx, option, value)
_check_rc(rc)
def get(self, option):
"""get context option
see zmq_ctx_get
"""
rc = C.zmq_ctx_get(self._zmq_ctx, option)
_check_rc(rc, error_without_errno=False)
return rc
def term(self):
if self.closed:
return
rc = C.zmq_ctx_destroy(self._zmq_ctx)
try:
_check_rc(rc)
except InterruptedSystemCall:
# ignore interrupted term
# see PEP 475 notes about close & EINTR for why
pass
self._zmq_ctx = None
self._closed = True
__all__ = ['Context']
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