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* atimer.c (toplevel) [HAVE_TIMERFD]: Include errno.h.

Browse Source 
(timerfd_callback): Ignore weird events with no data.  Add tight
assertions and comments.
(init_atimer) [HAVE_TIMERFD]: Add environment variable to optionally
disabletimerfd-based timer.  Use TFD_NONBLOCK for timer descriptor.
This commit is contained in:
Dmitry Antipov 2014-08-01 10:52:02 +04:00
parent bc1ce1df86
commit 11804a04ad
2 changed files with 29 additions and 6 deletions
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8
src/ChangeLog
View File

@ -1,3 +1,11 @@
2014-08-01 Dmitry Antipov <dmantipov@yandex.ru>
* atimer.c (toplevel) [HAVE_TIMERFD]: Include errno.h.
(timerfd_callback): Ignore weird events with no data. Add tight
assertions and comments.
(init_atimer) [HAVE_TIMERFD]: Add environment variable to optionally
disable timerfd-based timer. Use TFD_NONBLOCK for timer descriptor.
2014-08-01 Paul Eggert <eggert@cs.ucla.edu>
* frame.c (x_set_frame_parameters): Fix typo in previous patch.

27
src/atimer.c
View File

@ -27,6 +27,7 @@ along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
#include <unistd.h>
#ifdef HAVE_TIMERFD
#include <errno.h>
# include <sys/timerfd.h>
#endif
@ -399,14 +400,26 @@ handle_alarm_signal (int sig)
void
timerfd_callback (int fd, void *arg)
{
char buf[8];
ptrdiff_t nbytes;
uint64_t expirations;
eassert (fd == timerfd);
nbytes = emacs_read (fd, buf, sizeof (buf));
/* Just discard an expiration count for now. */
eassert (nbytes == sizeof (buf));
do_pending_atimers ();
nbytes = emacs_read (fd, &expirations, sizeof (expirations));
if (nbytes == sizeof (expirations))
{
/* Timer should expire just once. */
eassert (expirations == 1);
do_pending_atimers ();
}
else if (nbytes < 0)
/* For some not yet known reason, we may get weird event and no
data on timer descriptor. This can break Gnus at least, see:
http://lists.gnu.org/archive/html/emacs-devel/2014-07/msg00503.html. */
eassert (errno == EAGAIN);
else
/* I don't know what else can happen with this descriptor. */
emacs_abort ();
}
#endif /* HAVE_TIMERFD */
@ -528,7 +541,9 @@ init_atimer (void)
{
#ifdef HAVE_ITIMERSPEC
# ifdef HAVE_TIMERFD
timerfd = timerfd_create (CLOCK_REALTIME, TFD_CLOEXEC);
/* Until this feature is considered stable, you can ask to not use it. */
timerfd = (egetenv ("EMACS_IGNORE_TIMERFD") ? -1 :
timerfd_create (CLOCK_REALTIME, TFD_NONBLOCK | TFD_CLOEXEC));
# endif
if (timerfd < 0)
{