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https://github.com/isc-projects/bind9.git
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a5f13b3410
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.
147 lines
2.9 KiB
C
147 lines
2.9 KiB
C
/*
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* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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*
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* SPDX-License-Identifier: MPL-2.0
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, you can obtain one at https://mozilla.org/MPL/2.0/.
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*
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* See the COPYRIGHT file distributed with this work for additional
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* information regarding copyright ownership.
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*/
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#pragma once
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#include <inttypes.h>
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#include <isc/barrier.h>
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#include <isc/job.h>
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#include <isc/loop.h>
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#include <isc/magic.h>
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#include <isc/mem.h>
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#include <isc/refcount.h>
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#include <isc/result.h>
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#include <isc/signal.h>
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#include <isc/thread.h>
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#include <isc/types.h>
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#include <isc/urcu.h>
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#include <isc/uv.h>
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#include <isc/work.h>
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#include "async_p.h"
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#include "job_p.h"
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/*
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* Per-thread loop
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*/
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#define LOOP_MAGIC ISC_MAGIC('L', 'O', 'O', 'P')
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#define VALID_LOOP(t) ISC_MAGIC_VALID(t, LOOP_MAGIC)
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struct isc_loop {
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int magic;
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isc_refcount_t references;
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isc_thread_t thread;
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uv_loop_t loop;
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isc_tid_t tid;
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isc_mem_t *mctx;
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/* states */
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bool paused;
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bool shuttingdown;
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/* Async queue */
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uv_async_t async_trigger;
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isc_jobqueue_t async_jobs;
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/* Jobs queue */
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uv_idle_t run_trigger;
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isc_joblist_t run_jobs;
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/* Pause */
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uv_async_t pause_trigger;
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/* Shutdown */
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uv_async_t shutdown_trigger;
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isc_jobqueue_t setup_jobs;
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isc_jobqueue_t teardown_jobs;
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/* Destroy */
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uv_async_t destroy_trigger;
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/* safe memory reclamation */
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uv_prepare_t quiescent;
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/* thread pools */
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isc__workthread_t *workthreads[ISC_WORKLANE_COUNT];
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};
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/*
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* Loop Manager
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*/
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#define LOOPMGR_MAGIC ISC_MAGIC('L', 'o', 'o', 'M')
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#define VALID_LOOPMGR(t) ISC_MAGIC_VALID(t, LOOPMGR_MAGIC)
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typedef struct isc_loopmgr {
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int magic;
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isc_mem_t *mctx;
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uint_fast32_t nloops;
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atomic_bool shuttingdown;
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atomic_bool running;
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atomic_bool paused;
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/* signal handling */
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isc_signal_t *sigint;
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isc_signal_t *sigterm;
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/* pause/resume */
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isc_barrier_t pausing;
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isc_barrier_t resuming;
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/* start/stop */
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isc_barrier_t starting;
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/* stopping */
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isc_barrier_t stopping;
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/* per-thread objects */
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isc_loop_t *loops;
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} isc_loopmgr_t;
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/*
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* Signal Handler
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*/
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#define SIGNAL_MAGIC ISC_MAGIC('S', 'I', 'G', ' ')
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#define VALID_SIGNAL(t) ISC_MAGIC_VALID(t, SIGNAL_MAGIC)
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struct isc_signal {
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int magic;
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uv_signal_t signal;
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isc_loop_t *loop;
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isc_signal_cb cb;
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void *cbarg;
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int signum;
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};
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/*
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* Job to be scheduled in an event loop
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*/
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#define JOB_MAGIC ISC_MAGIC('J', 'O', 'B', ' ')
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#define VALID_JOB(t) ISC_MAGIC_VALID(t, JOB_MAGIC)
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#define DEFAULT_LOOP(loopmgr) (&(loopmgr)->loops[0])
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#define CURRENT_LOOP(loopmgr) (&(loopmgr)->loops[isc_tid()])
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#define LOOP(loopmgr, tid) (&(loopmgr)->loops[tid])
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#define ON_LOOP(loop) ((loop) == CURRENT_LOOP((loop)->loopmgr))
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isc__workthread_t *
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isc__loopmgr_workthread(isc_loop_t *loop, isc_worklane_t lane);
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void
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isc__loopmgr_starting(void);
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void
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isc__loopmgr_stopping(void);
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