def __init__(self, kind, value, maxvalue, *, ctx):
if ctx is None:
ctx = context._default_context.get_context()
name = ctx.get_start_method()
unlink_now = sys.platform == 'win32' or name == 'fork'
for i in range(100):
try:
sl = self._semlock = _multiprocessing.SemLock(
kind, value, maxvalue, self._make_name(), unlink_now)
except FileExistsError:
pass
else:
break
else:
raise FileExistsError('cannot find name for semaphore')
util.debug('created semlock with handle %s' % sl.handle)
self._make_methods()
if sys.platform != 'win32':
def _after_fork(obj):
obj._semlock._after_fork()
util.register_after_fork(self, _after_fork)
if self._semlock.name is not None:
# We only get here if we are on Unix with forking
# disabled. When the object is garbage collected or the
# process shuts down we unlink the semaphore name
from .semaphore_tracker import register
register(self._semlock.name)
util.Finalize(self,
SemLock._cleanup, (self._semlock.name, ),
exitpriority=0)
def __init__(self, kind, value, maxvalue):
sl = self._semlock = _multiprocessing.SemLock(kind, value, maxvalue)
debug('created semlock with handle %s' % sl.handle)
self._make_methods()
if sys.platform != 'win32':
def _after_fork(obj):
obj._semlock._after_fork()
register_after_fork(self, _after_fork)
