New submission from STINNER Victor <victor.stin...@haypocalc.com>: Polling should be avoided when it's possible. For subprocess.wait(), we can do something with signals (SIGCHLD and/or SIGCLD).
sigtimedwait() can be used to wait a the "a child process terminated" with a timeout, but not wait a specific process (so we may use a loop). sigtimedwait() doesn't call the signal handler, and so it changes the behaviour if the parent process has a signal handler for SIGCHLD/SIGCLD. If sigtimedwait() is not available, we may use a signal handler. For example, we can use the "wakeup fd" tool of the signal module. Problem: the parent program may already have such handler / use "wakeup fd". We should at least restore the previous signal handler when we are done. ---------- assignee: pitrou components: Library (Lib) messages: 136958 nosy: haypo, pitrou priority: normal severity: normal status: open title: subprocess.wait() with a timeout uses polling on POSIX type: performance versions: Python 3.3 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue12187> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
