[New-bugs-announce] [issue18078] threading.Condition to allow notify on a specific waiter

João Bernardo report at bugs.python.org
Tue May 28 05:40:19 CEST 2013

New submission from João Bernardo:

If users could provide an inner lock for `threading.Condition` acquire when making a thread wait, it would allow for notifying a specific waiter.

Because of race conditions, using:


may not wake the thread I want. Also, I may not want to wake the first waiter at all.

So my proposal is something along the lines:

class Condition:

    def wait(self, timeout=None, lock=None):
        waiter = _allocate_lock() if lock is None else lock

    def notify_one(self, lock): 
        # Maybe could notify a list of locks?

        except ValueError:
            # Maybe RuntimeError("Lock not waiting in this Condition")

components: Library (Lib)
messages: 190173
nosy: JBernardo
priority: normal
severity: normal
status: open
title: threading.Condition to allow notify on a specific waiter
type: enhancement
versions: Python 3.4

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