- if (uatomic_read(&completion->futex) == -1)
- futex_async(&completion->futex, FUTEX_WAIT, -1,
- NULL, NULL, 0);
+ if (uatomic_read(&completion->futex) != -1)
+ return;
+ while (futex_async(&completion->futex, FUTEX_WAIT, -1,
+ NULL, NULL, 0)) {
+ switch (errno) {
+ case EWOULDBLOCK:
+ /* Value already changed. */
+ return;
+ case EINTR:
+ /* Retry if interrupted by signal. */
+ break; /* Get out of switch. */
+ default:
+ /* Unexpected error. */
+ urcu_die(errno);
+ }
+ }