On Thu, Dec 17, 2015 at 09:05:48PM +0100, Waldemar Brodkorb wrote: > Hi Nicolas, > Nicolas S. Dade wrote, > > > Linux has a pselect syscall since 2.6.something. Using it > > rather than emulating it with sigprocmask+select+sigprocmask > > is smaller code, and works properly. (The emulation has > > race conditions when unblocked signals arrive before or > > after the select) > > Did you see the race condition in real code or do you have > a testcase for it?
The race conditions should be easy to reproduce since you have a relatively huge syscall-latency-length (several us) window to race with. Fake pselect implementations are historically known to be harmful; the whole reason pselect was invented was to fix these races in old code that used sigprocmask followed by select. Rich _______________________________________________ uClibc mailing list [email protected] http://lists.busybox.net/mailman/listinfo/uclibc
