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b40ce4165d
Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
174 lines
5.3 KiB
C
174 lines
5.3 KiB
C
/*-
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* Copyright (c) 1999 Michael Smith <msmith@freebsd.org>
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* All rights reserved.
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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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/eventhandler.h>
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static MALLOC_DEFINE(M_EVENTHANDLER, "eventhandler", "Event handler records");
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/* List of 'slow' lists */
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static TAILQ_HEAD(, eventhandler_list) eventhandler_lists;
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static int eventhandler_lists_initted = 0;
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static struct mtx eventhandler_mutex;
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struct eventhandler_entry_generic
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{
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struct eventhandler_entry ee;
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void (* func)(void);
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};
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/*
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* Initialize the eventhandler mutex and list.
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*/
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static void
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eventhandler_init(void *dummy __unused)
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{
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TAILQ_INIT(&eventhandler_lists);
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mtx_init(&eventhandler_mutex, "eventhandler", MTX_DEF | MTX_RECURSE);
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eventhandler_lists_initted = 1;
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}
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SYSINIT(eventhandlers, SI_SUB_EVENTHANDLER, SI_ORDER_FIRST, eventhandler_init,
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NULL)
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/*
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* Insertion is O(n) due to the priority scan, but optimises to O(1)
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* if all priorities are identical.
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*/
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eventhandler_tag
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eventhandler_register(struct eventhandler_list *list, char *name,
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void *func, void *arg, int priority)
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{
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struct eventhandler_entry_generic *eg;
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struct eventhandler_entry *ep;
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KASSERT(eventhandler_lists_initted, ("eventhandler registered too early"));
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/* lock the eventhandler lists */
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mtx_lock(&eventhandler_mutex);
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/* Do we need to find/create the (slow) list? */
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if (list == NULL) {
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/* look for a matching, existing list */
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list = eventhandler_find_list(name);
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/* Do we need to create the list? */
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if (list == NULL) {
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if ((list = malloc(sizeof(struct eventhandler_list) + strlen(name) + 1,
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M_EVENTHANDLER, M_NOWAIT)) == NULL) {
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mtx_unlock(&eventhandler_mutex);
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return(NULL);
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}
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list->el_flags = 0;
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list->el_name = (char *)list + sizeof(struct eventhandler_list);
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strcpy(list->el_name, name);
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TAILQ_INSERT_HEAD(&eventhandler_lists, list, el_link);
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}
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}
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if (!(list->el_flags & EHE_INITTED)) {
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TAILQ_INIT(&list->el_entries);
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lockinit(&list->el_lock, PZERO, name, 0, 0);
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list->el_flags = EHE_INITTED;
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}
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/* allocate an entry for this handler, populate it */
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if ((eg = malloc(sizeof(struct eventhandler_entry_generic),
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M_EVENTHANDLER, M_NOWAIT)) == NULL) {
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mtx_unlock(&eventhandler_mutex);
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return(NULL);
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}
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eg->func = func;
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eg->ee.ee_arg = arg;
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eg->ee.ee_priority = priority;
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/* sort it into the list */
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lockmgr(&list->el_lock, LK_EXCLUSIVE, NULL, curthread);
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for (ep = TAILQ_FIRST(&list->el_entries);
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ep != NULL;
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ep = TAILQ_NEXT(ep, ee_link)) {
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if (eg->ee.ee_priority < ep->ee_priority) {
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TAILQ_INSERT_BEFORE(ep, &eg->ee, ee_link);
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break;
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}
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}
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if (ep == NULL)
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TAILQ_INSERT_TAIL(&list->el_entries, &eg->ee, ee_link);
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lockmgr(&list->el_lock, LK_RELEASE, NULL, curthread);
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mtx_unlock(&eventhandler_mutex);
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return(&eg->ee);
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}
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void
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eventhandler_deregister(struct eventhandler_list *list, eventhandler_tag tag)
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{
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struct eventhandler_entry *ep = tag;
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/* XXX insert diagnostic check here? */
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lockmgr(&list->el_lock, LK_EXCLUSIVE, NULL, curthread);
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if (ep != NULL) {
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/* remove just this entry */
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TAILQ_REMOVE(&list->el_entries, ep, ee_link);
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free(ep, M_EVENTHANDLER);
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} else {
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/* remove entire list */
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while (!TAILQ_EMPTY(&list->el_entries)) {
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ep = TAILQ_FIRST(&list->el_entries);
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TAILQ_REMOVE(&list->el_entries, ep, ee_link);
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free(ep, M_EVENTHANDLER);
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}
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}
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lockmgr(&list->el_lock, LK_RELEASE, NULL, curthread);
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}
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struct eventhandler_list *
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eventhandler_find_list(char *name)
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{
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struct eventhandler_list *list;
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if (!eventhandler_lists_initted)
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return(NULL);
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/* scan looking for the requested list */
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mtx_lock(&eventhandler_mutex);
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for (list = TAILQ_FIRST(&eventhandler_lists);
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list != NULL;
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list = TAILQ_NEXT(list, el_link)) {
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if (!strcmp(name, list->el_name))
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break;
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}
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mtx_unlock(&eventhandler_mutex);
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return(list);
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}
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