[Python-Dev] Proposed addition to threading module (original) (raw)
Nick Coghlan ncoghlan at iinet.net.au
Mon Apr 24 05:44:52 CEST 2006
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Do we want to add a "released" context manager to the threading module for 2.5? It was mentioned using the name "unlocked" in PEP 343, but never spelt out:
class released(object): def init(self, lock): self.lock = lock def enter(self): self.lock.release() def exit(self, *exc_info): self.lock.acquire()
(This context manager is the equivalent of PEP 319's asynchronize keyword)
Usage would be:
from threading import RLock, released
sync_lock = RLock()
def thread_safe(): with sync_lock: # This is thread-safe with released(sync_lock): # Perform long-running or blocking operation # that doesn't need to hold the lock # We have the lock back here
(This particular example could be handled by two separate "with sync_lock" statements with the asynchronous operation between them, but other cases put the asynchronous operation inside a loop or a conditional statement which means that particular trick won't work).
Cheers, Nick.
-- Nick Coghlan | ncoghlan at gmail.com | Brisbane, Australia
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