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Flock object uses fcntl.flock to lock (resp. unlock) file descriptor (fd) with operation (op) when entering (resp. leaving) runtime context related to it.

Project Description

flock.Flock(fd, op)

Flock object uses fcntl.flock to lock (resp. unlock) file descriptor (fd) with operation (op) when entering (resp. leaving) runtime context related to it.

File objects providing a fileno() method are accepted as well.

Operation is one of the following values:

  • LOCK_SH - acquire a shared lock
  • LOCK_EX - acquire an exclusive lock

Operation can also be bitwise ORed with LOCK_NB to avoid blocking on lock acquisition.

Example:

with open(‘/tmp/file.lock’, ‘w’) as f:

blocking_lock = flock.Flock(f, flock.LOCK_EX) noblocking_lock = flock.Flock(f, flock.LOCK_EX|flock.LOCK_NB)

with blocking_lock:
pass # do something here
try:
with noblocking_lock:
pass # do something else here
except BlockingIOError:
pass

Release history Release notifications

This version
History Node

0.1

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Filename, size & hash SHA256 hash help File type Python version Upload date
flock-0.1.tar.gz (1.4 kB) Copy SHA256 hash SHA256 Source None Oct 1, 2014

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