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util/libsync: Fix timeout handling if poll() wakes up early

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Check how long poll waited, and use a smaller timeout on the next
iteration through the loop.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12268>
This commit is contained in:
Jesse Natalie 2021-11-02 10:10:01 -07:00 committed by Marge Bot
parent 1ab906d17f
commit df92a13a27
1 changed files with 6 additions and 0 deletions
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6
src/util/libsync.h
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@ -36,6 +36,7 @@
#include <sys/ioctl.h>
#include <sys/poll.h>
#include <unistd.h>
#include <time.h>
#if defined(__cplusplus)
extern "C" {
@ -102,12 +103,15 @@ static inline int sync_wait(int fd, int timeout)
{
struct pollfd fds = {0};
int ret;
struct timespec poll_start, poll_end;
fds.fd = fd;
fds.events = POLLIN;
do {
clock_gettime(CLOCK_MONOTONIC, &poll_start);
ret = poll(&fds, 1, timeout);
clock_gettime(CLOCK_MONOTONIC, &poll_end);
if (ret > 0) {
if (fds.revents & (POLLERR | POLLNVAL)) {
errno = EINVAL;
@ -118,6 +122,8 @@ static inline int sync_wait(int fd, int timeout)
errno = ETIME;
return -1;
}
timeout -= (poll_end.tv_sec - poll_start.tv_sec) * 1000 +
(poll_end.tv_nsec - poll_end.tv_nsec) / 1000000;
} while (ret == -1 && (errno == EINTR || errno == EAGAIN));
return ret;