From: Hrvoje Nikšić <hniksic@gmail.com>
Date: Wed, 29 May 2019 17:08:17 +0000 (+0200)
Subject: bpo-36794: Document that Lock.acquire is fair. (GH-13082)
X-Git-Tag: v3.8.0b1~140
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=34f4f5efea730504216ee19f237734e0bb0104ee;p=python

bpo-36794: Document that Lock.acquire is fair. (GH-13082)



https://bugs.python.org/issue36794
---

diff --git a/Doc/library/asyncio-sync.rst b/Doc/library/asyncio-sync.rst
index e3f18ccb43..79f6b02d85 100644
--- a/Doc/library/asyncio-sync.rst
+++ b/Doc/library/asyncio-sync.rst
@@ -66,6 +66,13 @@ Lock
       This method waits until the lock is *unlocked*, sets it to
       *locked* and returns ``True``.
 
+      When more than one coroutine is blocked in :meth:`acquire`
+      waiting for the lock to be unlocked, only one coroutine
+      eventually proceeds.
+
+      Acquiring a lock is *fair*: the coroutine that proceeds will be
+      the first coroutine that started waiting on the lock.
+
    .. method:: release()
 
       Release the lock.