tree 9fc17c3751d7a9ab7b6ed969d63356f5852fd32f
parent c460c91633d5407a02f9d3aadf0abece5a4e4b45
author Willy Tarreau <w@1wt.eu> 1592460315 +0200
committer Willy Tarreau <w@1wt.eu> 1592460530 +0200
encoding latin1

MINOR: fd: slightly optimize the fd_takeover double-CAS loop

The loop in fd_takeover() around the double-CAS is conditionned on
a previous value of old_masks[0] that always matches tid_bit on the
first iteration because it does not result from the atomic op but
from a pre-loaded value. Let's set the result of the atomic op there
instead so that the conflict between threads can be detected earlier
and before performing the double-word CAS.