tree b2894902f827dd6f74f14be99edbb28b52260afe
parent 9ce62b5498b27fbf4217d9c25779d5b2ceca23f2
author Olivier Houchard <ohouchard@haproxy.com> 1556556726 +0200
committer Willy Tarreau <w@1wt.eu> 1556629817 +0200
encoding latin1

BUG/MEDIUM: port_range: Make the ring buffer lock-free.

Port range uses a ring buffer, and unfortunately, when making haproxy
multithreaded, it's been overlooked, and the ring buffer is not thread-safe.
When specifying a source range, 2 or more threads could pick the same
port, and of course only one of them could use the port, the others would
always fail the connection.
To fix this, make it a lock-free ring buffer. This is easier than usual
because we know the ring buffer can never be full.

This should be backported to 1.8 and 1.9.