On Wed, Apr 15, 2020 at 06:15:26PM -0700, Brian Geffon wrote: > And all of that I guess makes sense in the case of a non-blocking fd, > but what about the case of a blocking file descriptor? Both > userfaultfd and eventfd can seemingly be stuck in a read syscall with > no way to break them out when the userfaultfd/eventfd has no further > utility. Here is an example: > https://gist.github.com/bgaff/607302d86d99ac539efca307ce2dd679 If an application wants to terminate blocking calls it has to rely on signal delivery or pthread_cancel to end it. This is very complicated so it is generally better to use poll and non blocking. Jason
