Module pexicdb.lock

Classes

class Lock

Simple lock mechanism to perform operations in queue.

Loop is used to wait while the lock is used by another function, after one by one operation is performed.

Basic example:

import time
import threading
from pexicdb.lock import Lock

lock = Lock()

def a1():
    with lock:
        for i in range(10):
            print("a1:",i)
            time.sleep(0.5)

def b1():
    with lock:
        for i in range(10):
            print("b1:",i)
            time.sleep(0.5)

t1 = threading.Thread(target=a1)
t2 = threading.Thread(target=b1)
t1.start()
t2.start()

Expand source code

class Lock:
    """
    Simple lock mechanism to perform operations in queue.

    Loop is used to wait while the lock is used by another function,
    after one by one operation is performed.

    Basic example:
    ```
    import time
    import threading
    from pexicdb.lock import Lock

    lock = Lock()

    def a1():
        with lock:
            for i in range(10):
                print("a1:",i)
                time.sleep(0.5)

    def b1():
        with lock:
            for i in range(10):
                print("b1:",i)
                time.sleep(0.5)

    t1 = threading.Thread(target=a1)
    t2 = threading.Thread(target=b1)
    t1.start()
    t2.start()
    ```
    """
    def __init__(self) -> None:
        self.__locked = False
    
    def __enter__(self):
        while self.__locked is True:
            time.sleep(0.05)
        
        self.__locked = True

    def __exit__(self, *args, **kws):
        self.__locked = False