[CC += libc-help] Hi Arkadiusz, On Wed, Jan 01, 2025 at 11:20:26PM +0100, Arkadiusz Drabczyk wrote: > In man/man7/signal.7 it says: > > > If a blocked call to one of the following interfaces is interrupted > > by a signal handler, then the call is automatically restarted after > > the signal handler returns if the SA_RESTART flag was used; > > otherwise the call fails with the error EINTR: > > (...) > > • pthread_mutex_lock(3), pthread_cond_wait(3), and related APIs. > > I don't understand this, in my experiments neither > pthread_mutex_lock() nor pthread_cond_wait() return EINTR even if > signal handler was installed without using SA_RESTART flag. Please show some minimal examples if you can. > The > underlying futex() call indeed fails with EINTR but it's called again > by both glibc and musl. I've CCed glibc, in case they can comment. Maybe this behavior changed at some point in the past? I don't know. > Additionally both > man/man3/pthread_mutex_lock.3 and man/man3/pthread_cond_wait.3 say > that these functions do not return EINTR. Those pages are too old. They were unmaintained in a Debian package, and we adopted them recently. I wouldn't trust them blindly. > Is my understanding of the signal.7 wrong or does it need some work? It might need some work. Thanks for the report! Have a lovely new year! Alex -- <https://www.alejandro-colomar.es/>
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