120 lines
3.7 KiB
C
120 lines
3.7 KiB
C
/*
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* Copyright (c) 2016 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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#include <stddef.h>
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#include <kern/debug.h>
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#include <kern/locks.h>
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#include <kern/thread.h>
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#include <kern/thread_call.h>
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#include <net/nwk_wq.h>
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#include <sys/proc_internal.h>
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#include <sys/systm.h>
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#include <sys/mcache.h>
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static TAILQ_HEAD(, nwk_wq_entry) nwk_wq_head =
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TAILQ_HEAD_INITIALIZER(nwk_wq_head);
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static LCK_GRP_DECLARE(nwk_wq_lock_group, "Network work queue lock");
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static LCK_MTX_DECLARE(nwk_wq_lock, &nwk_wq_lock_group);
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/* Wait channel for Network work queue */
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static void *nwk_wq_waitch = NULL;
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static void nwk_wq_thread_func(void *, wait_result_t);
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static int nwk_wq_thread_cont(int err);
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static void nwk_wq_thread_func(void *v, wait_result_t w);
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void
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nwk_wq_init(void)
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{
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thread_t nwk_wq_thread __single = THREAD_NULL;
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if (kernel_thread_start(nwk_wq_thread_func,
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NULL, &nwk_wq_thread) != KERN_SUCCESS) {
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panic_plain("%s: couldn't create network work queue thread", __func__);
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/* NOTREACHED */
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}
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thread_deallocate(nwk_wq_thread);
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}
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static int
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nwk_wq_thread_cont(int err)
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{
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TAILQ_HEAD(, nwk_wq_entry) temp_nwk_wq_head;
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struct nwk_wq_entry *nwk_item __single;
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struct nwk_wq_entry *nwk_item_next __single;
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#pragma unused(err)
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for (;;) {
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nwk_item = NULL;
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nwk_item_next = NULL;
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TAILQ_INIT(&temp_nwk_wq_head);
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LCK_MTX_ASSERT(&nwk_wq_lock, LCK_MTX_ASSERT_OWNED);
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while (TAILQ_FIRST(&nwk_wq_head) == NULL) {
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(void) msleep0(&nwk_wq_waitch, &nwk_wq_lock,
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(PZERO - 1), "nwk_wq_thread_cont", 0,
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nwk_wq_thread_cont);
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/* NOTREACHED */
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}
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TAILQ_SWAP(&temp_nwk_wq_head, &nwk_wq_head, nwk_wq_entry, nwk_wq_link);
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VERIFY(TAILQ_EMPTY(&nwk_wq_head));
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lck_mtx_unlock(&nwk_wq_lock);
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VERIFY(TAILQ_FIRST(&temp_nwk_wq_head) != NULL);
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TAILQ_FOREACH_SAFE(nwk_item, &temp_nwk_wq_head, nwk_wq_link, nwk_item_next) {
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nwk_item->func(nwk_item);
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/* nwk_item has been freed by the callback */
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}
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lck_mtx_lock(&nwk_wq_lock);
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}
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}
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__dead2
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static void
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nwk_wq_thread_func(void *v, wait_result_t w)
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{
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#pragma unused(v, w)
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lck_mtx_lock(&nwk_wq_lock);
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(void) msleep0(&nwk_wq_waitch, &nwk_wq_lock,
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(PZERO - 1), "nwk_wq_thread_func", 0, nwk_wq_thread_cont);
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/*
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* msleep0() shouldn't have returned as PCATCH was not set;
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* therefore assert in this case.
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*/
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lck_mtx_unlock(&nwk_wq_lock);
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VERIFY(0);
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}
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void
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nwk_wq_enqueue(struct nwk_wq_entry *nwk_item)
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{
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lck_mtx_lock(&nwk_wq_lock);
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TAILQ_INSERT_TAIL(&nwk_wq_head, nwk_item, nwk_wq_link);
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lck_mtx_unlock(&nwk_wq_lock);
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wakeup((caddr_t)&nwk_wq_waitch);
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}
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