Re: [PATCH RFC v2 0/7] epoll: Introduce new syscalls, epoll_ctl_batch and epoll_pwait1

On Wed, 02/04 13:38, Andy Lutomirski wrote:

On Wed, Feb 4, 2015 at 2:36 AM, Fam Zheng [off-list ref] wrote:

quoted

2) epoll_pwait1
---------------

NAME
       epoll_pwait1 - wait for an I/O event on an epoll file descriptor

SYNOPSIS

       #include <sys/epoll.h>

       int epoll_pwait1(int epfd, int flags,
                        struct epoll_event *events,
                        int maxevents,
                        struct timespec *timeout,
                        struct sigargs *sig);

DESCRIPTION

       The epoll_pwait1 system call differs from epoll_pwait only in parameter
       types. The first difference is timeout, a pointer to timespec structure
       which allows nanosecond presicion; the second difference, which should
       probably be wrapper by glibc and only expose a sigset_t pointer as in
       pselect6.

       If timeout is NULL, it's treated as if 0 is specified in epoll_pwait
       (return immediately). Otherwise it's converted to nanosecond scalar,
       again, with the same convention as epoll_pwait's timeout.

Is the timeout absolute or relative?

Relative. Will document it. We can add a first flag for absolute timeout later.

Thanks.

Fam

I'd kind of like the ability to set timeouts on multiple clocks at the
same time, but I can live without that.

Please see my reply to Michael.

Fam