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"""0MQ Context class."""
# coding: utf-8
# Copyright (c) PyZMQ Developers.
# Distributed under the terms of the Lesser GNU Public License (LGPL).
from libc.stdlib cimport free, malloc, realloc
from libzmq cimport *
cdef extern from "getpid_compat.h":
int getpid()
from zmq.error import ZMQError
from zmq.backend.cython.checkrc cimport _check_rc
_instance = None
cdef class Context:
"""Context(io_threads=1)
Manage the lifecycle of a 0MQ context.
Parameters
----------
io_threads : int
The number of IO threads.
"""
# no-op for the signature
def __init__(self, io_threads=1, shadow=0):
pass
def __cinit__(self, int io_threads=1, size_t shadow=0, **kwargs):
self.handle = NULL
self._sockets = NULL
if shadow:
self.handle = <void *>shadow
self._shadow = True
else:
self._shadow = False
if ZMQ_VERSION_MAJOR >= 3:
self.handle = zmq_ctx_new()
else:
self.handle = zmq_init(io_threads)
if self.handle == NULL:
raise ZMQError()
cdef int rc = 0
if ZMQ_VERSION_MAJOR >= 3 and not self._shadow:
rc = zmq_ctx_set(self.handle, ZMQ_IO_THREADS, io_threads)
_check_rc(rc)
self.closed = False
self._n_sockets = 0
self._max_sockets = 32
self._sockets = <void **>malloc(self._max_sockets*sizeof(void *))
if self._sockets == NULL:
raise MemoryError("Could not allocate _sockets array")
self._pid = getpid()
def __dealloc__(self):
"""don't touch members in dealloc, just cleanup allocations"""
cdef int rc
if self._sockets != NULL:
free(self._sockets)
self._sockets = NULL
self._n_sockets = 0
# we can't call object methods in dealloc as it
# might already be partially deleted
if not self._shadow:
self._term()
cdef inline void _add_socket(self, void* handle):
"""Add a socket handle to be closed when Context terminates.
This is to be called in the Socket constructor.
"""
if self._n_sockets >= self._max_sockets:
self._max_sockets *= 2
self._sockets = <void **>realloc(self._sockets, self._max_sockets*sizeof(void *))
if self._sockets == NULL:
raise MemoryError("Could not reallocate _sockets array")
self._sockets[self._n_sockets] = handle
self._n_sockets += 1
cdef inline void _remove_socket(self, void* handle):
"""Remove a socket from the collected handles.
This should be called by Socket.close, to prevent trying to
close a socket a second time.
"""
cdef bint found = False
for idx in range(self._n_sockets):
if self._sockets[idx] == handle:
found=True
break
if found:
self._n_sockets -= 1
if self._n_sockets:
# move last handle to closed socket's index
self._sockets[idx] = self._sockets[self._n_sockets]
@property
def underlying(self):
"""The address of the underlying libzmq context"""
return <size_t> self.handle
# backward-compat, though nobody is using it
_handle = underlying
cdef inline int _term(self):
cdef int rc=0
if self.handle != NULL and not self.closed and getpid() == self._pid:
with nogil:
rc = zmq_ctx_destroy(self.handle)
self.handle = NULL
return rc
def term(self):
"""ctx.term()
Close or terminate the context.
This can be called to close the context by hand. If this is not called,
the context will automatically be closed when it is garbage collected.
"""
cdef int rc
rc = self._term()
self.closed = True
def set(self, int option, optval):
"""ctx.set(option, optval)
Set a context option.
See the 0MQ API documentation for zmq_ctx_set
for details on specific options.
.. versionadded:: libzmq-3.2
.. versionadded:: 13.0
Parameters
----------
option : int
The option to set. Available values will depend on your
version of libzmq. Examples include::
zmq.IO_THREADS, zmq.MAX_SOCKETS
optval : int
The value of the option to set.
"""
cdef int optval_int_c
cdef int rc
cdef char* optval_c
if self.closed:
raise RuntimeError("Context has been destroyed")
if not isinstance(optval, int):
raise TypeError('expected int, got: %r' % optval)
optval_int_c = optval
rc = zmq_ctx_set(self.handle, option, optval_int_c)
_check_rc(rc)
def get(self, int option):
"""ctx.get(option)
Get the value of a context option.
See the 0MQ API documentation for zmq_ctx_get
for details on specific options.
.. versionadded:: libzmq-3.2
.. versionadded:: 13.0
Parameters
----------
option : int
The option to get. Available values will depend on your
version of libzmq. Examples include::
zmq.IO_THREADS, zmq.MAX_SOCKETS
Returns
-------
optval : int
The value of the option as an integer.
"""
cdef int optval_int_c
cdef size_t sz
cdef int rc
if self.closed:
raise RuntimeError("Context has been destroyed")
rc = zmq_ctx_get(self.handle, option)
_check_rc(rc)
return rc
def destroy(self, linger=None):
"""ctx.destroy(linger=None)
Close all sockets associated with this context, and then terminate
the context. If linger is specified,
the LINGER sockopt of the sockets will be set prior to closing.
.. warning::
destroy involves calling ``zmq_close()``, which is **NOT** threadsafe.
If there are active sockets in other threads, this must not be called.
"""
cdef int linger_c
cdef bint setlinger=False
if linger is not None:
linger_c = linger
setlinger=True
if self.handle != NULL and not self.closed and self._n_sockets:
while self._n_sockets:
if setlinger:
zmq_setsockopt(self._sockets[0], ZMQ_LINGER, &linger_c, sizeof(int))
rc = zmq_close(self._sockets[0])
if rc < 0 and zmq_errno() != ZMQ_ENOTSOCK:
raise ZMQError()
self._n_sockets -= 1
self._sockets[0] = self._sockets[self._n_sockets]
self.term()
__all__ = ['Context']
|
