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linux: try epoll_pwait if epoll_wait is missing

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It seems that epoll_wait is implemented in glibc in terms of epoll_pwait and
new architectures (like arm64) do not implement the epoll_wait syscall at all.
So if epoll_wait errors with ENOSYS, just call epoll_pwait.

This is a backport of 861de3d71d for v0.10
branch.
This commit is contained in:
Michael Hudson-Doyle 2014-09-15 21:27:05 +12:00 committed by Saúl Ibarra Corretgé
parent c60d6af011
commit ef7b783d8d
1 changed files with 17 additions and 4 deletions
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21
src/unix/linux-core.c
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@ -138,6 +138,7 @@ void uv__io_poll(uv_loop_t* loop, int timeout) {
int fd;
int op;
int i;
static int no_epoll_wait;
if (loop->nfds == 0) {
assert(ngx_queue_empty(&loop->watcher_queue));
@ -184,10 +185,22 @@ void uv__io_poll(uv_loop_t* loop, int timeout) {
count = 48; /* Benchmarks suggest this gives the best throughput. */
for (;;) {
nfds = uv__epoll_wait(loop->backend_fd,
events,
ARRAY_SIZE(events),
timeout);
if (!no_epoll_wait) {
nfds = uv__epoll_wait(loop->backend_fd,
events,
ARRAY_SIZE(events),
timeout);
if (nfds == -1 && errno == ENOSYS) {
no_epoll_wait = 1;
continue;
}
} else {
nfds = uv__epoll_pwait(loop->backend_fd,
events,
ARRAY_SIZE(events),
timeout,
NULL);
}
/* Update loop->time unconditionally. It's tempting to skip the update when
* timeout == 0 (i.e. non-blocking poll) but there is no guarantee that the