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"""
Implementation of the standard :mod:`thread` module that spawns greenlets.
.. note::
This module is a helper for :mod:`gevent.monkey` and is not
intended to be used directly. For spawning greenlets in your
applications, prefer higher level constructs like
:class:`gevent.Greenlet` class or :func:`gevent.spawn`.
"""
from __future__ import absolute_import
import sys
__implements__ = ['allocate_lock',
'get_ident',
'exit',
'LockType',
'stack_size',
'start_new_thread',
'_local']
__imports__ = ['error']
if sys.version_info[0] <= 2:
import thread as __thread__ # pylint:disable=import-error
else:
import _thread as __thread__ # pylint:disable=import-error
__target__ = '_thread'
__imports__ += ['RLock',
'TIMEOUT_MAX',
'allocate',
'exit_thread',
'interrupt_main',
'start_new']
error = __thread__.error
from gevent._compat import PY3
from gevent._compat import PYPY
from gevent._util import copy_globals
from gevent.hub import getcurrent, GreenletExit
from gevent.greenlet import Greenlet
from gevent.lock import BoundedSemaphore
from gevent.local import local as _local
def get_ident(gr=None):
if gr is None:
gr = getcurrent()
return id(gr)
def start_new_thread(function, args=(), kwargs=None):
if kwargs is not None:
greenlet = Greenlet.spawn(function, *args, **kwargs)
else:
greenlet = Greenlet.spawn(function, *args)
return get_ident(greenlet)
class LockType(BoundedSemaphore):
# Change the ValueError into the appropriate thread error
# and any other API changes we need to make to match behaviour
_OVER_RELEASE_ERROR = __thread__.error
if PYPY and PY3:
_OVER_RELEASE_ERROR = RuntimeError
if PY3:
_TIMEOUT_MAX = __thread__.TIMEOUT_MAX # python 2: pylint:disable=no-member
def acquire(self, blocking=True, timeout=-1):
# Transform the default -1 argument into the None that our
# semaphore implementation expects, and raise the same error
# the stdlib implementation does.
if timeout == -1:
timeout = None
if not blocking and timeout is not None:
raise ValueError("can't specify a timeout for a non-blocking call")
if timeout is not None:
if timeout < 0:
# in C: if(timeout < 0 && timeout != -1)
raise ValueError("timeout value must be strictly positive")
if timeout > self._TIMEOUT_MAX:
raise OverflowError('timeout value is too large')
return BoundedSemaphore.acquire(self, blocking, timeout)
allocate_lock = LockType
def exit():
raise GreenletExit
if hasattr(__thread__, 'stack_size'):
_original_stack_size = __thread__.stack_size
def stack_size(size=None):
if size is None:
return _original_stack_size()
if size > _original_stack_size():
return _original_stack_size(size)
else:
pass
# not going to decrease stack_size, because otherwise other greenlets in this thread will suffer
else:
__implements__.remove('stack_size')
__imports__ = copy_globals(__thread__, globals(),
only_names=__imports__,
ignore_missing_names=True)
__all__ = __implements__ + __imports__
__all__.remove('_local')
# XXX interrupt_main
# XXX _count()
|
