tree 3d74c63a59c06ba3b6ab0c25a32157b0115d530b
parent 2ea1b49832e7617ec97ac7df7a87c8d8328b17e2
author Olivier Houchard <ohouchard@haproxy.com> 1582820773 +0100
committer Olivier Houchard <cognet@ci0.org> 1584455407 +0100

MEDIUM: fd: Introduce a running mask, and use it instead of the spinlock.

In the struct fdtab, introduce a new mask, running_mask. Each thread should
add its bit before using the fd.
Use the running_mask instead of a lock, in fd_insert/fd_delete, we'll just
spin as long as the mask is non-zero, to be sure we access the data
exclusively.
fd_set_running_excl() spins until the mask is 0, fd_set_running() just
adds the thread bit, and fd_clr_running() removes it.