blaze-lock

blaze-lock is a python module which implements areaders-writer lock using Redis.

Installation

pip install blazelock

Implementation

acquire_read_lock:
  mutex_lock_acquire and not writer_waiting
  reader_count ++
  mutex_lock_release

release_read_lock:
  mutex_lock_acquire
  reader_count --
  if reader_count == 0:
    notify_all
  mutex_lock_release

acquire_writer_lock:
  mutex_lock_acquire
  while reader_count > 0:
    writer_waiting = true
    wait

release_writer_lock:
  writer_waiting = false
  mutex_lock_release

wait:
  mutex_lock_release
  wake_signal
  mutex_lock_acquire