On Sun, May 27, 2018 at 10:03:32PM -0700, Daniel Austin
<[email protected]> wrote:
> Hi. What is the proper mechanism to trigger an event in a separate
> process, not a separate thread, assuming a modern Linux kernel?
>
> 1) Use ev_io on an eventfd file descriptor. Use normal eventfd file
That, or a pipe, are the most reasonable options. Which one is faster
depends very much on the application.
> "register" with the triggering process, but they do need to get access to
> the file description number somehow (e.g. shared memory or other means).
The fd number is useless in another process - you cna pass file
descriptions to other pürocesses with file descriptor passing via a unix
domain socket, though, or inheriting using fork for example.
> 2) Use ev_async. I think the proper usage here would be to put the
ev_async cannot be used for this purpose.
> 3) Something else?
Use inotify to watch for file changes. There are some other mechanisms,
but for general event handling, you want a pipe or something like eventfd.
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