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Linux server122.web-hosting.com 4.18.0-513.18.1.lve.el8.x86_64 #1 SMP Thu Feb 22 12:55:50 UTC 2024 x86_64

Path : /opt/cloudlinux/venv/lib/python3.11/site-packages/clcommon/

Current File : //opt/cloudlinux/venv/lib/python3.11/site-packages/clcommon/lock.py

#!/usr/bin/python
# coding=utf-8
#
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2019 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT
from __future__ import absolute_import
import contextlib
import fcntl
import os


def setup_lock(lockfile_path):
    lock_file_dir = os.path.dirname(lockfile_path)
    if lock_file_dir != '' and not os.path.exists(lock_file_dir):
        os.makedirs(os.path.dirname(lockfile_path))

    fd = open(lockfile_path, 'a+')

    # waiting till lock is acquired
    fcntl.flock(fd, fcntl.LOCK_EX)

    fd.seek(0, 0)
    fd.truncate()
    fd.write(str(os.getpid()))
    fd.flush()

    return fd


def release_lock(fd):
    fcntl.flock(fd.fileno(), fcntl.LOCK_UN)
    fd.close()


@contextlib.contextmanager
def acquire_lock(lockfile_path):
    """
    Usage:
    with acquire_lock():
       ... do something ...
    """
    fd = setup_lock(lockfile_path)
    yield
    release_lock(fd)

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