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Offloaded work used two different mechanisms: a per-loop isc_helper
thread for CPU-bound crypto (DNSSEC validation, message signature
checks) and the process-global libuv thread pool for blocking I/O (zone
load and dump, inbound transfer apply). Neither could cancel a queued
task, and the two disagreed about exclusive mode — the helper paused
with its loop under isc_loopmgr_pause() but the libuv pool did not, so
blocking offloaded work kept running while a loop held the exclusive
lock.
Unify both behind isc_work: each loop gets its own worker thread per
lane — FAST for short, bounded tasks and SLOW for long, blocking ones —
fed by a private queue. Separate lanes keep a short crypto task off the
path of a multi-second zone dump once both run on per-loop workers;
every lane parks with isc_loopmgr_pause() so exclusive mode now quiesces
offloaded work too; and a still-queued task can be canceled before it
starts (isc_work_cancel). isc_helper is removed and its callers select a
lane.
(cherry picked from commit
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| dig.c | ||
| dig.rst | ||
| dighost.c | ||
| dighost.h | ||
| host.c | ||
| host.rst | ||
| Makefile.am | ||
| nslookup.c | ||
| nslookup.rst | ||
| readline.h | ||