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# -*- coding: utf-8 -*-
"""
# mlock support
# Copyright (c) 2019-2024 Michael Büsch <m@bues.ch>
# Licensed under the GNU/GPL version 2 or later.
"""
import platform
import os
import sys
__all__ = [
"MLockWrapper",
]
class MLockWrapper:
"""OS mlock wrapper.
"""
__singleton = None
@classmethod
def get(cls):
if cls.__singleton is None:
cls.__singleton = cls()
return cls.__singleton
def __init__(self):
self.__ffi = None
self.__linux_libc = None
isLinux = os.name == "posix" and "linux" in sys.platform.lower()
isWindows = os.name == "nt" and "win32" in sys.platform.lower()
if isLinux:
try:
from cffi import FFI
except ImportError as e:
print("Failed to import CFFI: %s\n"
"Cannot use mlock() via CFFI.\n"
"You might want to install CFFI by running: "
"pip3 install cffi" % (
str(e)), file=sys.stderr)
return
self.__ffi = FFI()
# Use getattr to avoid Cython cdef compile error.
getattr(self.__ffi, "cdef")("int mlockall(int flags);")
self.__linux_libc = self.__ffi.dlopen(None)
elif isWindows:
pass # TODO
else:
pass # Unsupported OS.
def mlockall(self):
"""Lock all current and all future memory.
"""
error = "mlockall() is not supported on this operating system."
if self.__linux_libc is not None and self.__ffi is not None:
if platform.machine().lower() in (
"alpha",
"ppc", "ppc64", "ppcle", "ppc64le",
"sparc", "sparc64" ):
MCL_CURRENT = 0x2000
MCL_FUTURE = 0x4000
else:
MCL_CURRENT = 0x1
MCL_FUTURE = 0x2
ret = self.__linux_libc.mlockall(MCL_CURRENT | MCL_FUTURE)
error = os.strerror(self.__ffi.errno) if ret else ""
return error
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