tree b8efc73b2bce8278471895cffcf5ec4e370c7da9
parent b1093c6ba21ae3d41946f3a7bb4886b8b90e7c27
author Willy Tarreau <w@1wt.eu> 1657402726 +0200
committer Willy Tarreau <w@1wt.eu> 1657906990 +0200
encoding latin1

MEDIUM: poller: disable thread-groups for poll() and select()

These old legacy pollers are not designed for this. They're still
using a shared list of events for all threads, this will not scale at
all, so there's no point in enabling thread-groups there. Modern
systems have epoll, kqueue or event ports and do not need these ones.

We arrange for failing at boot time, only when thread-groups > 1 so
that existing setups will remain unaffected.

If there's a compelling reason for supporting thread groups with these
pollers in the future, the rework should not be too hard, it would just
consume a lot of memory to have an fd_evts[] array per thread, but that
is doable.