162 lines
4.1 KiB
C
162 lines
4.1 KiB
C
/* $NetBSD: npf_worker.c,v 1.1 2013/06/02 02:20:04 rmind Exp $ */
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/*-
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* Copyright (c) 2010-2013 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This material is based upon work partially supported by The
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* NetBSD Foundation under a contract with Mindaugas Rasiukevicius.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: npf_worker.c,v 1.1 2013/06/02 02:20:04 rmind Exp $");
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/mutex.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#include "npf_impl.h"
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#define NPF_MAX_WORKS 4
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#define WORKER_INTERVAL mstohz(5 * 1000)
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static kmutex_t worker_lock;
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static kcondvar_t worker_cv;
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static kcondvar_t worker_event_cv;
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static lwp_t * worker_lwp;
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static uint64_t worker_loop;
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static npf_workfunc_t work_funcs[NPF_MAX_WORKS];
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static void npf_worker(void *) __dead;
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int
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npf_worker_sysinit(void)
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{
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mutex_init(&worker_lock, MUTEX_DEFAULT, IPL_SOFTNET);
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cv_init(&worker_cv, "npfgccv");
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cv_init(&worker_event_cv, "npfevcv");
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worker_lwp = (lwp_t *)0xdeadbabe;
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worker_loop = 1;
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if (kthread_create(PRI_NONE, KTHREAD_MPSAFE | KTHREAD_MUSTJOIN, NULL,
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npf_worker, NULL, &worker_lwp, "npfgc")) {
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return ENOMEM;
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}
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return 0;
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}
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void
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npf_worker_sysfini(void)
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{
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lwp_t *l = worker_lwp;
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/* Notify the worker and wait for the exit. */
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mutex_enter(&worker_lock);
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worker_lwp = NULL;
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cv_broadcast(&worker_cv);
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mutex_exit(&worker_lock);
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kthread_join(l);
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/* LWP has exited, destroy the structures. */
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cv_destroy(&worker_cv);
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cv_destroy(&worker_event_cv);
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mutex_destroy(&worker_lock);
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}
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void
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npf_worker_signal(void)
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{
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mutex_enter(&worker_lock);
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cv_signal(&worker_cv);
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mutex_exit(&worker_lock);
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}
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static bool
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npf_worker_testset(npf_workfunc_t find, npf_workfunc_t set)
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{
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for (u_int i = 0; i < NPF_MAX_WORKS; i++) {
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if (work_funcs[i] == find) {
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work_funcs[i] = set;
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return true;
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}
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}
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return false;
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}
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void
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npf_worker_register(npf_workfunc_t func)
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{
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mutex_enter(&worker_lock);
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npf_worker_testset(NULL, func);
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mutex_exit(&worker_lock);
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}
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void
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npf_worker_unregister(npf_workfunc_t func)
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{
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uint64_t l = worker_loop;
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mutex_enter(&worker_lock);
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npf_worker_testset(func, NULL);
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while (worker_loop == l) {
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cv_signal(&worker_cv);
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cv_wait(&worker_event_cv, &worker_lock);
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}
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mutex_exit(&worker_lock);
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}
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static void
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npf_worker(void *arg)
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{
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for (;;) {
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const bool finish = (worker_lwp == NULL);
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u_int i = NPF_MAX_WORKS;
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npf_workfunc_t work;
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/* Run the jobs. */
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while (i--) {
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if ((work = work_funcs[i]) != NULL) {
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work();
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}
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}
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/* Exit if requested and all jobs are done. */
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if (finish) {
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break;
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}
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/* Sleep and periodically wake up, unless we get notified. */
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mutex_enter(&worker_lock);
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worker_loop++;
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cv_broadcast(&worker_event_cv);
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cv_timedwait(&worker_cv, &worker_lock, WORKER_INTERVAL);
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mutex_exit(&worker_lock);
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}
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kthread_exit(0);
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}
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