reader-writer-locks 0.0.3

Reader Writer Lock

ReaderWriterLock

This Python package addresses the reader-writer problems. It supports both multithreading and multiprocessing environment in Python.

The package is implemented based on a RLock and 2 Condition Variables

Refer to Wikipedia for full detail about reader-writer lock.

Installation

pip install reader-writer-locks

Usage

1. Choose between the following option

Priority Policies	option
Not specified	0
Reader priority	1
Writer priority	2

2. Instantiate locks based on the chosen option

# in case of multithreading usage

from reader_writer_lock import MultithreadingFactory
rw = MultithreadingFactory(option)
r_lock = rw.get_read_lock()
w_lock = rw.get_write_lock()

# in case of multiprocessing usage

from reader_writer_lock import MultiprocessingFactory 
# same as multi threading cases

3. Use the generated lock to protect critical sections Pythonic usage

with r_lock:
    # Read
with w_lock:
    # Write

Future work

1. To avoid starvation problem. (As the Condition Object in Python does not work in FIFO manner)
2. To add blocking & timeout interface, which follows the RLock interface