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#
# Copyright (C) 2017 Codethink Limited
# Copyright (C) 2018 Bloomberg Finance LP
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
import os
import resource
from ..sandbox import SandboxDummy
from .platform import Platform
class Darwin(Platform):
# This value comes from OPEN_MAX in syslimits.h
OPEN_MAX = 10240
def get_cpu_count(self, cap=None):
cpu_count = os.cpu_count()
if cap is None:
return cpu_count
else:
return min(cpu_count, cap)
def maximize_open_file_limit(self):
# Note that on Mac OSX, you may not be able to simply set the soft
# limit to the reported hard limit, as it may not be the only limit in
# effect. The output of these commands may be somewhat independent:
#
# $ launchctl limit
# $ sysctl -a | grep files
#
# The OPEN_MAX value from syslimits.h seems to be fairly safe, although
# users may tweak their individual systems to have different values.
# Without a way to determine what the real limit is, we risk failing to
# increase the limit. Perhaps the complication is why psutil does not
# support rlimit on Mac.
#
old_soft_limit, hard_limit = resource.getrlimit(resource.RLIMIT_NOFILE)
soft_limit = min(max(self.OPEN_MAX, old_soft_limit), hard_limit)
resource.setrlimit(resource.RLIMIT_NOFILE, (soft_limit, hard_limit))
@staticmethod
def _check_dummy_sandbox_config(config):
return True
@staticmethod
def _create_dummy_sandbox(*args, **kwargs):
kwargs["dummy_reason"] = (
"OSXFUSE is not supported and there are no supported sandbox " + "technologies for MacOS at this time"
)
return SandboxDummy(*args, **kwargs)
def _setup_dummy_sandbox(self):
self.check_sandbox_config = Darwin._check_dummy_sandbox_config
self.create_sandbox = Darwin._create_dummy_sandbox
return True
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