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util/qemu-timer: Busy-wait in poll to prioritize timer deadlines

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Matt Borgerson 2021-03-02 02:18:16 -07:00 committed by mborgerson
parent 48c1720da8
commit 1336c6a0ff
1 changed files with 16 additions and 0 deletions
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16
util/qemu-timer.c
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@ -347,6 +347,22 @@ int qemu_poll_ns(GPollFD *fds, guint nfds, int64_t timeout)
return ppoll((struct pollfd *)fds, nfds, &ts, NULL); return ppoll((struct pollfd *)fds, nfds, &ts, NULL);
} }
#else #else
#ifdef XBOX
/* Timers are facilitated by this function. Busy-wait if the deadline is
* near, to avoid missing deadlines due to costly sleeps.
*/
#define XBOX_BUSYWAIT_THRESHOLD_NS 1250000
if ((0 < timeout) && (timeout < XBOX_BUSYWAIT_THRESHOLD_NS)) {
int64_t now = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
int64_t end = now + timeout;
while (now < end) {
now = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
}
timeout = 0;
}
#endif
return g_poll(fds, nfds, qemu_timeout_ns_to_ms(timeout)); return g_poll(fds, nfds, qemu_timeout_ns_to_ms(timeout));
#endif #endif
} }