poll: stop treating on POLLPRI as 'read'

Current code was considering "can read" as having either POLLIN or POLLPRI being
set.
This may lead to client being awaken because of POLLPRI, starting a blocking
read and getting stuck because there is actually nothing to read.

This patch removes POLLPRI handling in read code and I'll add specific
API to wait for POLLPRI.

https://bugzilla.gnome.org/show_bug.cgi?id=794977

diff --git a/gst/gstpoll.c b/gst/gstpoll.c
index fd672ed..1cc17d1 100644 (file)
--- a/gst/gstpoll.c
+++ b/gst/gstpoll.c
@@ -1021,9 +1021,9 @@ gst_poll_fd_ctl_read_unlocked (GstPoll * set, GstPollFD * fd, gboolean active)
     struct pollfd *pfd = &g_array_index (set->fds, struct pollfd, idx);
 
     if (active)
-      pfd->events |= (POLLIN | POLLPRI);
+      pfd->events |= POLLIN;
     else
-      pfd->events &= ~(POLLIN | POLLPRI);
+      pfd->events &= ~POLLIN;
 #else
     gst_poll_update_winsock_event_mask (set, idx, FD_READ | FD_ACCEPT, active);
 #endif
@@ -1201,7 +1201,7 @@ gst_poll_fd_can_read_unlocked (const GstPoll * set, GstPollFD * fd)
 #ifndef G_OS_WIN32
     struct pollfd *pfd = &g_array_index (set->active_fds, struct pollfd, idx);
 
-    res = (pfd->revents & (POLLIN | POLLPRI)) != 0;
+    res = (pfd->revents & POLLIN) != 0;
 #else
     WinsockFd *wfd = &g_array_index (set->active_fds, WinsockFd, idx);