Victor Stinner email@example.com:
But I don't get you point. How does this PEP make the situation worse?
Did I say it would? I just wanted to make sure the system call resumption doesn't become mandatory.
Haven't thought through what the exception raising technique would entail. It might be perfectly ok apart from being a change to the signal handler API.
I don't know issues of signals with select() (and without a file descriptor used to wake up it).
A signal handler often sets a flag, which is inspected when select() returns. The problem is when a signal arrives between testing the flag and calling select(). The pselect() system call allows you to block signals and have the system call unblock them correctly to avoid the race.