719 lines
18 KiB
C
719 lines
18 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#include "libuutil_common.h"
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/time.h>
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#define ELEM_TO_NODE(lp, e) \
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((uu_list_node_impl_t *)((uintptr_t)(e) + (lp)->ul_offset))
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#define NODE_TO_ELEM(lp, n) \
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((void *)((uintptr_t)(n) - (lp)->ul_offset))
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/*
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* uu_list_index_ts define a location for insertion. They are simply a
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* pointer to the object after the insertion point. We store a mark
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* in the low-bits of the index, to help prevent mistakes.
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*
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* When debugging, the index mark changes on every insert and delete, to
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* catch stale references.
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*/
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#define INDEX_MAX (sizeof (uintptr_t) - 1)
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#define INDEX_NEXT(m) (((m) == INDEX_MAX)? 1 : ((m) + 1) & INDEX_MAX)
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#define INDEX_TO_NODE(i) ((uu_list_node_impl_t *)((i) & ~INDEX_MAX))
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#define NODE_TO_INDEX(p, n) (((uintptr_t)(n) & ~INDEX_MAX) | (p)->ul_index)
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#define INDEX_VALID(p, i) (((i) & INDEX_MAX) == (p)->ul_index)
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#define INDEX_CHECK(i) (((i) & INDEX_MAX) != 0)
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#define POOL_TO_MARKER(pp) ((void *)((uintptr_t)(pp) | 1))
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static uu_list_pool_t uu_null_lpool = { &uu_null_lpool, &uu_null_lpool };
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static pthread_mutex_t uu_lpool_list_lock = PTHREAD_MUTEX_INITIALIZER;
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uu_list_pool_t *
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uu_list_pool_create(const char *name, size_t objsize,
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size_t nodeoffset, uu_compare_fn_t *compare_func, uint32_t flags)
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{
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uu_list_pool_t *pp, *next, *prev;
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if (name == NULL ||
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uu_check_name(name, UU_NAME_DOMAIN) == -1 ||
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nodeoffset + sizeof (uu_list_node_t) > objsize) {
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uu_set_error(UU_ERROR_INVALID_ARGUMENT);
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return (NULL);
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}
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if (flags & ~UU_LIST_POOL_DEBUG) {
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uu_set_error(UU_ERROR_UNKNOWN_FLAG);
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return (NULL);
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}
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pp = uu_zalloc(sizeof (uu_list_pool_t));
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if (pp == NULL) {
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uu_set_error(UU_ERROR_NO_MEMORY);
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return (NULL);
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}
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(void) strlcpy(pp->ulp_name, name, sizeof (pp->ulp_name));
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pp->ulp_nodeoffset = nodeoffset;
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pp->ulp_objsize = objsize;
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pp->ulp_cmp = compare_func;
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if (flags & UU_LIST_POOL_DEBUG)
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pp->ulp_debug = 1;
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pp->ulp_last_index = 0;
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(void) pthread_mutex_init(&pp->ulp_lock, NULL);
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pp->ulp_null_list.ul_next_enc = UU_PTR_ENCODE(&pp->ulp_null_list);
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pp->ulp_null_list.ul_prev_enc = UU_PTR_ENCODE(&pp->ulp_null_list);
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(void) pthread_mutex_lock(&uu_lpool_list_lock);
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pp->ulp_next = next = &uu_null_lpool;
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pp->ulp_prev = prev = next->ulp_prev;
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next->ulp_prev = pp;
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prev->ulp_next = pp;
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(void) pthread_mutex_unlock(&uu_lpool_list_lock);
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return (pp);
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}
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void
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uu_list_pool_destroy(uu_list_pool_t *pp)
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{
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if (pp->ulp_debug) {
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if (pp->ulp_null_list.ul_next_enc !=
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UU_PTR_ENCODE(&pp->ulp_null_list) ||
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pp->ulp_null_list.ul_prev_enc !=
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UU_PTR_ENCODE(&pp->ulp_null_list)) {
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uu_panic("uu_list_pool_destroy: Pool \"%.*s\" (%p) has "
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"outstanding lists, or is corrupt.\n",
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(int)sizeof (pp->ulp_name), pp->ulp_name,
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(void *)pp);
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}
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}
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(void) pthread_mutex_lock(&uu_lpool_list_lock);
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pp->ulp_next->ulp_prev = pp->ulp_prev;
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pp->ulp_prev->ulp_next = pp->ulp_next;
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(void) pthread_mutex_unlock(&uu_lpool_list_lock);
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pp->ulp_prev = NULL;
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pp->ulp_next = NULL;
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uu_free(pp);
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}
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void
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uu_list_node_init(void *base, uu_list_node_t *np_arg, uu_list_pool_t *pp)
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{
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uu_list_node_impl_t *np = (uu_list_node_impl_t *)np_arg;
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if (pp->ulp_debug) {
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uintptr_t offset = (uintptr_t)np - (uintptr_t)base;
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if (offset + sizeof (*np) > pp->ulp_objsize) {
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uu_panic("uu_list_node_init(%p, %p, %p (\"%s\")): "
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"offset %ld doesn't fit in object (size %ld)\n",
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base, (void *)np, (void *)pp, pp->ulp_name,
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(long)offset, (long)pp->ulp_objsize);
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}
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if (offset != pp->ulp_nodeoffset) {
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uu_panic("uu_list_node_init(%p, %p, %p (\"%s\")): "
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"offset %ld doesn't match pool's offset (%ld)\n",
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base, (void *)np, (void *)pp, pp->ulp_name,
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(long)offset, (long)pp->ulp_objsize);
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}
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}
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np->uln_next = POOL_TO_MARKER(pp);
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np->uln_prev = NULL;
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}
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void
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uu_list_node_fini(void *base, uu_list_node_t *np_arg, uu_list_pool_t *pp)
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{
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uu_list_node_impl_t *np = (uu_list_node_impl_t *)np_arg;
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if (pp->ulp_debug) {
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if (np->uln_next == NULL &&
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np->uln_prev == NULL) {
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uu_panic("uu_list_node_fini(%p, %p, %p (\"%s\")): "
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"node already finied\n",
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base, (void *)np_arg, (void *)pp, pp->ulp_name);
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}
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if (np->uln_next != POOL_TO_MARKER(pp) ||
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np->uln_prev != NULL) {
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uu_panic("uu_list_node_fini(%p, %p, %p (\"%s\")): "
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"node corrupt or on list\n",
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base, (void *)np_arg, (void *)pp, pp->ulp_name);
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}
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}
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np->uln_next = NULL;
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np->uln_prev = NULL;
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}
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uu_list_t *
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uu_list_create(uu_list_pool_t *pp, void *parent, uint32_t flags)
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{
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uu_list_t *lp, *next, *prev;
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if (flags & ~(UU_LIST_DEBUG | UU_LIST_SORTED)) {
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uu_set_error(UU_ERROR_UNKNOWN_FLAG);
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return (NULL);
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}
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if ((flags & UU_LIST_SORTED) && pp->ulp_cmp == NULL) {
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if (pp->ulp_debug)
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uu_panic("uu_list_create(%p, ...): requested "
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"UU_LIST_SORTED, but pool has no comparison func\n",
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(void *)pp);
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uu_set_error(UU_ERROR_NOT_SUPPORTED);
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return (NULL);
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}
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lp = uu_zalloc(sizeof (*lp));
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if (lp == NULL) {
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uu_set_error(UU_ERROR_NO_MEMORY);
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return (NULL);
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}
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lp->ul_pool = pp;
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lp->ul_parent_enc = UU_PTR_ENCODE(parent);
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lp->ul_offset = pp->ulp_nodeoffset;
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lp->ul_debug = pp->ulp_debug || (flags & UU_LIST_DEBUG);
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lp->ul_sorted = (flags & UU_LIST_SORTED);
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lp->ul_numnodes = 0;
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lp->ul_index = (pp->ulp_last_index = INDEX_NEXT(pp->ulp_last_index));
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lp->ul_null_node.uln_next = &lp->ul_null_node;
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lp->ul_null_node.uln_prev = &lp->ul_null_node;
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lp->ul_null_walk.ulw_next = &lp->ul_null_walk;
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lp->ul_null_walk.ulw_prev = &lp->ul_null_walk;
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(void) pthread_mutex_lock(&pp->ulp_lock);
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next = &pp->ulp_null_list;
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prev = UU_PTR_DECODE(next->ul_prev_enc);
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lp->ul_next_enc = UU_PTR_ENCODE(next);
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lp->ul_prev_enc = UU_PTR_ENCODE(prev);
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next->ul_prev_enc = UU_PTR_ENCODE(lp);
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prev->ul_next_enc = UU_PTR_ENCODE(lp);
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(void) pthread_mutex_unlock(&pp->ulp_lock);
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return (lp);
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}
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void
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uu_list_destroy(uu_list_t *lp)
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{
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uu_list_pool_t *pp = lp->ul_pool;
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if (lp->ul_debug) {
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if (lp->ul_null_node.uln_next != &lp->ul_null_node ||
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lp->ul_null_node.uln_prev != &lp->ul_null_node) {
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uu_panic("uu_list_destroy(%p): list not empty\n",
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(void *)lp);
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}
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if (lp->ul_numnodes != 0) {
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uu_panic("uu_list_destroy(%p): numnodes is nonzero, "
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"but list is empty\n", (void *)lp);
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}
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if (lp->ul_null_walk.ulw_next != &lp->ul_null_walk ||
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lp->ul_null_walk.ulw_prev != &lp->ul_null_walk) {
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uu_panic("uu_list_destroy(%p): outstanding walkers\n",
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(void *)lp);
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}
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}
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(void) pthread_mutex_lock(&pp->ulp_lock);
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UU_LIST_PTR(lp->ul_next_enc)->ul_prev_enc = lp->ul_prev_enc;
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UU_LIST_PTR(lp->ul_prev_enc)->ul_next_enc = lp->ul_next_enc;
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(void) pthread_mutex_unlock(&pp->ulp_lock);
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lp->ul_prev_enc = UU_PTR_ENCODE(NULL);
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lp->ul_next_enc = UU_PTR_ENCODE(NULL);
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lp->ul_pool = NULL;
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uu_free(lp);
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}
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static void
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list_insert(uu_list_t *lp, uu_list_node_impl_t *np, uu_list_node_impl_t *prev,
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uu_list_node_impl_t *next)
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{
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if (lp->ul_debug) {
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if (next->uln_prev != prev || prev->uln_next != next)
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uu_panic("insert(%p): internal error: %p and %p not "
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"neighbors\n", (void *)lp, (void *)next,
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(void *)prev);
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if (np->uln_next != POOL_TO_MARKER(lp->ul_pool) ||
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np->uln_prev != NULL) {
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uu_panic("insert(%p): elem %p node %p corrupt, "
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"not initialized, or already in a list.\n",
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(void *)lp, NODE_TO_ELEM(lp, np), (void *)np);
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}
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/*
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* invalidate outstanding uu_list_index_ts.
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*/
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lp->ul_index = INDEX_NEXT(lp->ul_index);
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}
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np->uln_next = next;
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np->uln_prev = prev;
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next->uln_prev = np;
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prev->uln_next = np;
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lp->ul_numnodes++;
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}
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void
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uu_list_insert(uu_list_t *lp, void *elem, uu_list_index_t idx)
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{
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uu_list_node_impl_t *np;
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np = INDEX_TO_NODE(idx);
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if (np == NULL)
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np = &lp->ul_null_node;
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if (lp->ul_debug) {
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if (!INDEX_VALID(lp, idx))
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uu_panic("uu_list_insert(%p, %p, %p): %s\n",
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(void *)lp, elem, (void *)idx,
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INDEX_CHECK(idx)? "outdated index" :
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"invalid index");
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if (np->uln_prev == NULL)
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uu_panic("uu_list_insert(%p, %p, %p): out-of-date "
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"index\n", (void *)lp, elem, (void *)idx);
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}
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list_insert(lp, ELEM_TO_NODE(lp, elem), np->uln_prev, np);
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}
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void *
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uu_list_find(uu_list_t *lp, void *elem, void *private, uu_list_index_t *out)
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{
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int sorted = lp->ul_sorted;
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uu_compare_fn_t *func = lp->ul_pool->ulp_cmp;
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uu_list_node_impl_t *np;
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if (func == NULL) {
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if (out != NULL)
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*out = 0;
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uu_set_error(UU_ERROR_NOT_SUPPORTED);
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return (NULL);
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}
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for (np = lp->ul_null_node.uln_next; np != &lp->ul_null_node;
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np = np->uln_next) {
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void *ep = NODE_TO_ELEM(lp, np);
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int cmp = func(ep, elem, private);
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if (cmp == 0) {
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if (out != NULL)
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*out = NODE_TO_INDEX(lp, np);
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return (ep);
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}
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if (sorted && cmp > 0) {
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if (out != NULL)
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*out = NODE_TO_INDEX(lp, np);
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return (NULL);
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}
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}
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if (out != NULL)
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*out = NODE_TO_INDEX(lp, 0);
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return (NULL);
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}
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void *
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uu_list_nearest_next(uu_list_t *lp, uu_list_index_t idx)
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{
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uu_list_node_impl_t *np = INDEX_TO_NODE(idx);
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if (np == NULL)
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np = &lp->ul_null_node;
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if (lp->ul_debug) {
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if (!INDEX_VALID(lp, idx))
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uu_panic("uu_list_nearest_next(%p, %p): %s\n",
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(void *)lp, (void *)idx,
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INDEX_CHECK(idx)? "outdated index" :
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"invalid index");
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if (np->uln_prev == NULL)
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uu_panic("uu_list_nearest_next(%p, %p): out-of-date "
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"index\n", (void *)lp, (void *)idx);
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}
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if (np == &lp->ul_null_node)
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return (NULL);
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else
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return (NODE_TO_ELEM(lp, np));
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}
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void *
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uu_list_nearest_prev(uu_list_t *lp, uu_list_index_t idx)
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{
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uu_list_node_impl_t *np = INDEX_TO_NODE(idx);
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if (np == NULL)
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np = &lp->ul_null_node;
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if (lp->ul_debug) {
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if (!INDEX_VALID(lp, idx))
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uu_panic("uu_list_nearest_prev(%p, %p): %s\n",
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(void *)lp, (void *)idx, INDEX_CHECK(idx)?
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"outdated index" : "invalid index");
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if (np->uln_prev == NULL)
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uu_panic("uu_list_nearest_prev(%p, %p): out-of-date "
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"index\n", (void *)lp, (void *)idx);
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}
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if ((np = np->uln_prev) == &lp->ul_null_node)
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return (NULL);
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else
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return (NODE_TO_ELEM(lp, np));
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}
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static void
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list_walk_init(uu_list_walk_t *wp, uu_list_t *lp, uint32_t flags)
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{
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uu_list_walk_t *next, *prev;
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int robust = (flags & UU_WALK_ROBUST);
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int direction = (flags & UU_WALK_REVERSE)? -1 : 1;
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(void) memset(wp, 0, sizeof (*wp));
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wp->ulw_list = lp;
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wp->ulw_robust = robust;
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wp->ulw_dir = direction;
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if (direction > 0)
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wp->ulw_next_result = lp->ul_null_node.uln_next;
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else
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wp->ulw_next_result = lp->ul_null_node.uln_prev;
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if (lp->ul_debug || robust) {
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/*
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* Add this walker to the list's list of walkers so
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* uu_list_remove() can advance us if somebody tries to
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* remove ulw_next_result.
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*/
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wp->ulw_next = next = &lp->ul_null_walk;
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wp->ulw_prev = prev = next->ulw_prev;
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next->ulw_prev = wp;
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prev->ulw_next = wp;
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}
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}
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static uu_list_node_impl_t *
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list_walk_advance(uu_list_walk_t *wp, uu_list_t *lp)
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{
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uu_list_node_impl_t *np = wp->ulw_next_result;
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uu_list_node_impl_t *next;
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if (np == &lp->ul_null_node)
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return (NULL);
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next = (wp->ulw_dir > 0)? np->uln_next : np->uln_prev;
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wp->ulw_next_result = next;
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return (np);
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}
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static void
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list_walk_fini(uu_list_walk_t *wp)
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{
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/* GLXXX debugging? */
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if (wp->ulw_next != NULL) {
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wp->ulw_next->ulw_prev = wp->ulw_prev;
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wp->ulw_prev->ulw_next = wp->ulw_next;
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wp->ulw_next = NULL;
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wp->ulw_prev = NULL;
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}
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wp->ulw_list = NULL;
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wp->ulw_next_result = NULL;
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}
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uu_list_walk_t *
|
|
uu_list_walk_start(uu_list_t *lp, uint32_t flags)
|
|
{
|
|
uu_list_walk_t *wp;
|
|
|
|
if (flags & ~(UU_WALK_ROBUST | UU_WALK_REVERSE)) {
|
|
uu_set_error(UU_ERROR_UNKNOWN_FLAG);
|
|
return (NULL);
|
|
}
|
|
|
|
wp = uu_zalloc(sizeof (*wp));
|
|
if (wp == NULL) {
|
|
uu_set_error(UU_ERROR_NO_MEMORY);
|
|
return (NULL);
|
|
}
|
|
|
|
list_walk_init(wp, lp, flags);
|
|
return (wp);
|
|
}
|
|
|
|
void *
|
|
uu_list_walk_next(uu_list_walk_t *wp)
|
|
{
|
|
uu_list_t *lp = wp->ulw_list;
|
|
uu_list_node_impl_t *np = list_walk_advance(wp, lp);
|
|
|
|
if (np == NULL)
|
|
return (NULL);
|
|
|
|
return (NODE_TO_ELEM(lp, np));
|
|
}
|
|
|
|
void
|
|
uu_list_walk_end(uu_list_walk_t *wp)
|
|
{
|
|
list_walk_fini(wp);
|
|
uu_free(wp);
|
|
}
|
|
|
|
int
|
|
uu_list_walk(uu_list_t *lp, uu_walk_fn_t *func, void *private, uint32_t flags)
|
|
{
|
|
uu_list_node_impl_t *np;
|
|
|
|
int status = UU_WALK_NEXT;
|
|
|
|
int robust = (flags & UU_WALK_ROBUST);
|
|
int reverse = (flags & UU_WALK_REVERSE);
|
|
|
|
if (flags & ~(UU_WALK_ROBUST | UU_WALK_REVERSE)) {
|
|
uu_set_error(UU_ERROR_UNKNOWN_FLAG);
|
|
return (-1);
|
|
}
|
|
|
|
if (lp->ul_debug || robust) {
|
|
uu_list_walk_t my_walk;
|
|
void *e;
|
|
|
|
list_walk_init(&my_walk, lp, flags);
|
|
while (status == UU_WALK_NEXT &&
|
|
(e = uu_list_walk_next(&my_walk)) != NULL)
|
|
status = (*func)(e, private);
|
|
list_walk_fini(&my_walk);
|
|
} else {
|
|
if (!reverse) {
|
|
for (np = lp->ul_null_node.uln_next;
|
|
status == UU_WALK_NEXT && np != &lp->ul_null_node;
|
|
np = np->uln_next) {
|
|
status = (*func)(NODE_TO_ELEM(lp, np), private);
|
|
}
|
|
} else {
|
|
for (np = lp->ul_null_node.uln_prev;
|
|
status == UU_WALK_NEXT && np != &lp->ul_null_node;
|
|
np = np->uln_prev) {
|
|
status = (*func)(NODE_TO_ELEM(lp, np), private);
|
|
}
|
|
}
|
|
}
|
|
if (status >= 0)
|
|
return (0);
|
|
uu_set_error(UU_ERROR_CALLBACK_FAILED);
|
|
return (-1);
|
|
}
|
|
|
|
void
|
|
uu_list_remove(uu_list_t *lp, void *elem)
|
|
{
|
|
uu_list_node_impl_t *np = ELEM_TO_NODE(lp, elem);
|
|
uu_list_walk_t *wp;
|
|
|
|
if (lp->ul_debug) {
|
|
if (np->uln_prev == NULL)
|
|
uu_panic("uu_list_remove(%p, %p): elem not on list\n",
|
|
(void *)lp, elem);
|
|
/*
|
|
* invalidate outstanding uu_list_index_ts.
|
|
*/
|
|
lp->ul_index = INDEX_NEXT(lp->ul_index);
|
|
}
|
|
|
|
/*
|
|
* robust walkers must be advanced. In debug mode, non-robust
|
|
* walkers are also on the list. If there are any, it's an error.
|
|
*/
|
|
for (wp = lp->ul_null_walk.ulw_next; wp != &lp->ul_null_walk;
|
|
wp = wp->ulw_next) {
|
|
if (wp->ulw_robust) {
|
|
if (np == wp->ulw_next_result)
|
|
(void) list_walk_advance(wp, lp);
|
|
} else if (wp->ulw_next_result != NULL) {
|
|
uu_panic("uu_list_remove(%p, %p): active non-robust "
|
|
"walker\n", (void *)lp, elem);
|
|
}
|
|
}
|
|
|
|
np->uln_next->uln_prev = np->uln_prev;
|
|
np->uln_prev->uln_next = np->uln_next;
|
|
|
|
lp->ul_numnodes--;
|
|
|
|
np->uln_next = POOL_TO_MARKER(lp->ul_pool);
|
|
np->uln_prev = NULL;
|
|
}
|
|
|
|
void *
|
|
uu_list_teardown(uu_list_t *lp, void **cookie)
|
|
{
|
|
void *ep;
|
|
|
|
/*
|
|
* XXX: disable list modification until list is empty
|
|
*/
|
|
if (lp->ul_debug && *cookie != NULL)
|
|
uu_panic("uu_list_teardown(%p, %p): unexpected cookie\n",
|
|
(void *)lp, (void *)cookie);
|
|
|
|
ep = uu_list_first(lp);
|
|
if (ep)
|
|
uu_list_remove(lp, ep);
|
|
return (ep);
|
|
}
|
|
|
|
int
|
|
uu_list_insert_before(uu_list_t *lp, void *target, void *elem)
|
|
{
|
|
uu_list_node_impl_t *np = ELEM_TO_NODE(lp, target);
|
|
|
|
if (target == NULL)
|
|
np = &lp->ul_null_node;
|
|
|
|
if (lp->ul_debug) {
|
|
if (np->uln_prev == NULL)
|
|
uu_panic("uu_list_insert_before(%p, %p, %p): %p is "
|
|
"not currently on a list\n",
|
|
(void *)lp, target, elem, target);
|
|
}
|
|
if (lp->ul_sorted) {
|
|
if (lp->ul_debug)
|
|
uu_panic("uu_list_insert_before(%p, ...): list is "
|
|
"UU_LIST_SORTED\n", (void *)lp);
|
|
uu_set_error(UU_ERROR_NOT_SUPPORTED);
|
|
return (-1);
|
|
}
|
|
|
|
list_insert(lp, ELEM_TO_NODE(lp, elem), np->uln_prev, np);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
uu_list_insert_after(uu_list_t *lp, void *target, void *elem)
|
|
{
|
|
uu_list_node_impl_t *np = ELEM_TO_NODE(lp, target);
|
|
|
|
if (target == NULL)
|
|
np = &lp->ul_null_node;
|
|
|
|
if (lp->ul_debug) {
|
|
if (np->uln_prev == NULL)
|
|
uu_panic("uu_list_insert_after(%p, %p, %p): %p is "
|
|
"not currently on a list\n",
|
|
(void *)lp, target, elem, target);
|
|
}
|
|
if (lp->ul_sorted) {
|
|
if (lp->ul_debug)
|
|
uu_panic("uu_list_insert_after(%p, ...): list is "
|
|
"UU_LIST_SORTED\n", (void *)lp);
|
|
uu_set_error(UU_ERROR_NOT_SUPPORTED);
|
|
return (-1);
|
|
}
|
|
|
|
list_insert(lp, ELEM_TO_NODE(lp, elem), np, np->uln_next);
|
|
return (0);
|
|
}
|
|
|
|
size_t
|
|
uu_list_numnodes(uu_list_t *lp)
|
|
{
|
|
return (lp->ul_numnodes);
|
|
}
|
|
|
|
void *
|
|
uu_list_first(uu_list_t *lp)
|
|
{
|
|
uu_list_node_impl_t *n = lp->ul_null_node.uln_next;
|
|
if (n == &lp->ul_null_node)
|
|
return (NULL);
|
|
return (NODE_TO_ELEM(lp, n));
|
|
}
|
|
|
|
void *
|
|
uu_list_last(uu_list_t *lp)
|
|
{
|
|
uu_list_node_impl_t *n = lp->ul_null_node.uln_prev;
|
|
if (n == &lp->ul_null_node)
|
|
return (NULL);
|
|
return (NODE_TO_ELEM(lp, n));
|
|
}
|
|
|
|
void *
|
|
uu_list_next(uu_list_t *lp, void *elem)
|
|
{
|
|
uu_list_node_impl_t *n = ELEM_TO_NODE(lp, elem);
|
|
|
|
n = n->uln_next;
|
|
if (n == &lp->ul_null_node)
|
|
return (NULL);
|
|
return (NODE_TO_ELEM(lp, n));
|
|
}
|
|
|
|
void *
|
|
uu_list_prev(uu_list_t *lp, void *elem)
|
|
{
|
|
uu_list_node_impl_t *n = ELEM_TO_NODE(lp, elem);
|
|
|
|
n = n->uln_prev;
|
|
if (n == &lp->ul_null_node)
|
|
return (NULL);
|
|
return (NODE_TO_ELEM(lp, n));
|
|
}
|
|
|
|
/*
|
|
* called from uu_lockup() and uu_release(), as part of our fork1()-safety.
|
|
*/
|
|
void
|
|
uu_list_lockup(void)
|
|
{
|
|
uu_list_pool_t *pp;
|
|
|
|
(void) pthread_mutex_lock(&uu_lpool_list_lock);
|
|
for (pp = uu_null_lpool.ulp_next; pp != &uu_null_lpool;
|
|
pp = pp->ulp_next)
|
|
(void) pthread_mutex_lock(&pp->ulp_lock);
|
|
}
|
|
|
|
void
|
|
uu_list_release(void)
|
|
{
|
|
uu_list_pool_t *pp;
|
|
|
|
for (pp = uu_null_lpool.ulp_next; pp != &uu_null_lpool;
|
|
pp = pp->ulp_next)
|
|
(void) pthread_mutex_unlock(&pp->ulp_lock);
|
|
(void) pthread_mutex_unlock(&uu_lpool_list_lock);
|
|
}
|