tree 0252c5d3c1831d796ef259665fb7bebaf1c8809c
parent dc2f2753e97ecfe94827de56ee9efd2cd6d39ad3
author Olivier Houchard <ohouchard@haproxy.com> 1583428251 +0100
committer Olivier Houchard <cognet@ci0.org> 1584652053 +0100

MINOR: fd: Implement fd_takeover().

Implement a new function, fd_takeover(), that lets you become the thread
responsible for the fd. On architectures that do not have a double-width CAS,
use a global rwlock.
fd_set_running() was also changed to be able to compete with fd_takeover(),
either using a dooble-width CAS on both running_mask and thread_mask, or
by claiming a reader on the global rwlock. This extra operation should not
have any measurable impact on modern architectures where threading is
relevant.