Andy Pan 23fe1a52dc socketpair: add eventfd and use SOCK_NONBLOCK for socketpair() ... Currently, we use `pipe` for `wakeup_create`, which requires ***two*** file descriptors. Furthermore, given its complexity inside, `pipe` is a bit heavyweight for just a simple event wait/notify mechanism. `eventfd` would be a more suitable solution for this kind of scenario, kernel also advocates for developers to use `eventfd` instead of `pipe` in some simple use cases: Applications can use an eventfd file descriptor instead of a pipe (see pipe(2) in all cases where a pipe is used simply to signal events. The kernel overhead of an eventfd file descriptor is much lower than that of a pipe, and only one file descriptor is required (versus the two required for a pipe). This change adds the new backend of `eventfd` for `wakeup_create` and uses it where available, eliminating the overhead of `pipe`. Also, it optimizes the `wakeup_create` to eliminate the system calls that make file descriptors non-blocking by moving the logic of setting non-blocking flags on file descriptors to `socketpair.c` and using `SOCK_NONBLOCK` for `socketpair(2)`, `EFD_NONBLOCK` for `eventfd(2)`. Ref: https://man7.org/linux/man-pages/man7/pipe.7.html https://man7.org/linux/man-pages/man2/eventfd.2.html https://man7.org/linux/man-pages/man2/socketpair.2.html https://www.gnu.org/software/gnulib/manual/html_node/eventfd.html Closes #13874		2024-06-04 23:45:36 +02:00
..
curl_msh3.c	socketpair: add eventfd and use SOCK_NONBLOCK for socketpair()	2024-06-04 23:45:36 +02:00
curl_msh3.h
curl_ngtcp2.c	lib/v*: tidy up types and casts	2024-06-02 19:27:17 +02:00
curl_ngtcp2.h
curl_osslq.c	lib/v*: tidy up types and casts	2024-06-02 19:27:17 +02:00
curl_osslq.h
curl_quiche.c
curl_quiche.h
vquic_int.h
vquic-tls.c	gnutls: support CA caching	2024-06-04 08:17:55 +02:00
vquic-tls.h
vquic.c
vquic.h