filelock acquire stuck

[zutb]

# coding=utf-8
import time
import asyncio
from threading import Thread
from filelock import FileLock


class TestObject(object):
    def __init__(self):
        self.file_lock = FileLock('/tmp/test_file.lock')
        print("file_lock acquire")
        self.file_lock.acquire()
        print("file_lock acquired")

    def run(self):
        time.sleep(5)
        print("file_lock release")
        self.file_lock.release()
        print("file_lock releasd")


async def test1():
    test_obj = TestObject()
    Thread(target=test_obj.run).start()


async def main():
    await test1()
    time.sleep(1)
    await test1()

if __name__ == '__main__':
    asyncio.run(main())
    time.sleep(10)

[zutb]

filelock >=3.11.0
This problem exists in versions later than 3.11. 0

[gaborbernat]

Passes in the CI. That being if you can replicate it within our test suite, then would be easier for someone to work on this.

[olutra]

filelock >=3.11.0 This problem exists in versions later than 3.11. 0

v3.11.0 (2023-04-06)
Make the lock thread local.

[mstockm]

Hello @zutb , your code acquires the lock in the main thread (in TestObject.__init__) but then creates a new thread to call TestObject.run which releases the lock. Since the lock is thread-local, it is not actually releasing the same lock that was acquired in the main thread. If you modify the first line of your __init__ method to be:

self.file_lock = FileLock('/tmp/test_file.lock', thread_local=False)

it should work as expected. Alternatively you could modify your code to acquire and release the lock in the same thread