Skip to main content

A limited re-entrant readwrite lock

Project description

This is rwrlock a yet another python re-entrant rw lock

Goals

  • To make a rentrant read write lock as opposed to non re-entrant
  • Within one thread multiple readlocks can be obtained in reality only first in stack takes lock restreference count
  • Within onethreadmultiple write locks can be obtained again first gets lock restreference count
  • Within one thread if you want a read lock and have a write lock it acts as if read lock is obtained but keeps the write lock
  • Wihin one thread if you have a read lock and want a write lock read lock is dropped a write lock acquired. But when write is release the read lock is reobtained. This can lead to read consistency issues if not used carefuly.

This does not implement and priority between readers and writers

Usage:
            from rwrlock import RWRLock
            
            my_obj_rwlock = RWRLock()
            
            # When reading from my_obj:
            with my_obj_rwlock.r_locked():
                do_read_only_things_with(my_obj)
                    # promote to a write lock
                    with my_obj_rwlock.w_locked():
                        mutate(my_obj)
                
            # When writing to my_obj:
            with my_obj_rwlock.w_locked():
                mutate(my_obj)
                    # ok do to do read things as has a write lock
                    with my_obj_rwlock.r_locked():
                        do_read_only_things_with(my_obj)

Project details


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

rwrlock-0.0.5.tar.gz (7.4 kB view hashes)

Uploaded Source

Built Distribution

rwrlock-0.0.5-py3-none-any.whl (9.5 kB view hashes)

Uploaded Python 3

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page