New submission from Ed Schouten: Python's fcntl module already provides some support for making support for file locking optional. For example, constants like F_SETFL are only defined if present. Unfortunately, the accompanying functions 'flock()' and 'lockf()' are present unconditionally.
CloudABI, a sandboxed runtime environment for UNIX (https://mail.python.org/pipermail/python-dev/2016-July/145708.html), doesn't implement these ways of doing file locking, for the reason that these operations do not fit nicely within its process model. These locks are per-process; not per-descriptor. This means that processes cannot safely be composed or decomposed. Attached is a relatively small patch to make flock() and lockf() optional, only compiling them when the necessary APIs are present. The LOCK_* constants are now also defined optionally. ---------- components: Extension Modules files: patch-no-flock.txt messages: 272692 nosy: EdSchouten priority: normal severity: normal status: open title: [Patch] Complete bits necessary for making fcntl's file locking optional versions: Python 3.6 Added file: http://bugs.python.org/file44105/patch-no-flock.txt _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue27764> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
