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term: delayed rendering: read timers even though is_armed = false

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There's a race/chance that we'll have disarmed the delayed rendering
timers and still get the call.

While it _shouldn't_ be anything to read from the timers, it doesn't
hurt to try. And, if the timers *are* readable, not reading them means
we'll end up in an infinite FDM loop.
This commit is contained in:
Daniel Eklöf 2020-03-23 19:16:53 +01:00
parent 48091966cb
commit ba0d0e8bbb
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GPG key ID: 5BBD4992C116573F
1 changed files with 8 additions and 5 deletions
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13
terminal.c
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@ -396,8 +396,6 @@ fdm_delayed_render(struct fdm *fdm, int fd, int events, void *data)
return false;
struct terminal *term = data;
if (!term->delayed_render_timer.is_armed)
return true;
uint64_t unused;
ssize_t ret1 = 0;
@ -412,6 +410,9 @@ fdm_delayed_render(struct fdm *fdm, int fd, int events, void *data)
if (errno == EAGAIN)
return true;
if (!term->delayed_render_timer.is_armed)
return true;
LOG_ERRNO("failed to read timeout timer");
return false;
}
@ -425,13 +426,15 @@ fdm_delayed_render(struct fdm *fdm, int fd, int events, void *data)
last = (struct timespec){0};
#endif
render_refresh(term);
/* Reset timers */
struct itimerspec reset = {{0}};
timerfd_settime(term->delayed_render_timer.lower_fd, 0, &reset, NULL);
timerfd_settime(term->delayed_render_timer.upper_fd, 0, &reset, NULL);
term->delayed_render_timer.is_armed = false;
if (term->delayed_render_timer.is_armed) {
term->delayed_render_timer.is_armed = false;
render_refresh(term);
}
return true;
}