ppoll with multiple threads
The select(2) man page was updated about a year ago to clarify the behavior of pselect in multi-threaded programs.
Should a similar update be made to poll(2) for ppoll?
If I'm reading the kernel source (fs/select.c) correctly, both syscalls (pselect6 and ppoll) use a (possibly unfortunately named) "sigprocmask" function to manipulate the signal mask, so their behavior should be the same in this regard.
Also, it might be nice to clarify that these changes are clarifications of existing behavior, rather than new behavior (i.e. clarify the clarification). The current situation is pretty confusing:
http://stackoverflow.com/questions/17011460/ppoll-vs-pselect-with-multiple-threads
Signature · 8 lines
======================================================================== Ian Pilcher [email protected] Sometimes there's nothing left to do but crash and burn...or die trying. ======================================================================== -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
Hello Ian,
Quoted 6 lines · Ian Pilcher
The select(2) man page was updated about a year ago to clarify the behavior of pselect in multi-threaded programs.
Should a similar update be made to poll(2) for ppoll?
Yes. Done. And I made the same change in the description of epoll_pwait().
Thanks,
Michael
Quoted 11 lines
If I'm reading the kernel source (
fs/select.c) correctly, both syscalls (pselect6 and ppoll) use a (possibly unfortunately named) "sigprocmask" function to manipulate the signal mask, so their behavior should be the same in this regard.Also, it might be nice to clarify that these changes are clarifications of existing behavior, rather than new behavior (i.e. clarify the clarification). The current situation is pretty confusing:
http://stackoverflow.com/questions/17011460/ppoll-vs-pselect-with-multiple-threads
Signature · 7 lines
Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/ -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html