Guido van Rossum wrote: > Does Unix even promise that a signal gets delivered twice if it gets > sent quickly twice in a row?
No, it doesn't. However, this doesn't necessarily mean that you can just drop them when the pipe becomes full. If more than one type of signal is sharing a pipe, you don't want it getting filled up with signals of one type and causing signals of a different type to get lost. To guarantee that won't happen, you would have to either use a separate pipe for each signal type, or have some other scheme such as a bitmask keeping track of which signal types are in the pipe. > I have a worry though -- if signal handlers *always* and *only* > communicate by writing a byte to a FD, does that mean that the VM main > loop will have to attempt to read a byte from a pipe every time it > checks for signals? That sounds like a good reason for having the fd be an additional mechanism that you can turn on when you want it, but not the core mechanism for dealing with signals. -- Greg _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
