Usage

flockcontext provide two context manager for fcntl.flock. Flock locks an opened file while FlockOpen does the same job but opens the file for you.

FlockOpen exemples

Exclusive blocking lock:: python

from flockcontext import FlockOpen

with FlockOpen(‘/tmp/my.lock’, ‘w’) as lock:

lock.fd.write(‘Lockedn’)

Exclusive non-blocking lock:: python

from flockcontext import FlockOpen

try:

with FlockOpen(‘/tmp/my.lock’, ‘w’, blocking=False) as lock:

lock.fd.write(‘Lockedn’)

except IOError as e:

print(‘Can not acquire lock’)

Shared blocking lock:: python

from flockcontext import Flock

with FlockOpen(‘/tmp/my.lock’, ‘w’, exclusive=False) as lock:

lock.fd.write(‘Lockedn’)

Acquire and release within context:: python

from flockcontext import FlockOpen

with FlockOpen(‘/tmp/my.lock’, ‘w’) as lock:

print(‘Lock acquired’) lock.fd.write(‘Lockedn’)

lock.release() print(‘Lock released’)

lock.acquire() print(‘Lock acquired’) lock.fd.write(‘Lockedn’)

Flock exemples

Blocking lock:: python

from flockcontext import Flock

with open(‘/tmp/my.lock’, ‘w’) as fd:

with Flock(fd):

fd.write(‘Lockedn’)

Non blocking lock:: python

from flockcontext import Flock

with open(‘/tmp/my.lock’, ‘w’) as fd:

try:

with Flock(fd, blocking=False):

fd.write(‘Lockedn’)

except IOError as e:

print(‘Can not acquire lock’)

Shared lock:: python

from flockcontext import Flock

with open(‘/tmp/my.lock’, ‘w’) as fd:

with Flock(fd, exclusive=False):

fd.write(‘Lockedn’)

Acquire and release within context:: python

from flockcontext import Flock

with open(‘/tmp/my.lock’, ‘w’) as fd:

with Flock(fd) as lock:

print(‘Lock acquired’) fd.write(‘Lockedn’)

lock.release() print(‘Lock released’)

lock.acquire() print(‘Lock acquired’) fd.write(‘Lockedn’)