+++ /dev/null
-#ifndef _URCU_WFSTACK_STATIC_H
-#define _URCU_WFSTACK_STATIC_H
-
-/*
- * wfstack-static.h
- *
- * Userspace RCU library - Stack with Wait-Free push, Blocking pop.
- *
- * TO BE INCLUDED ONLY IN LGPL-COMPATIBLE CODE. See wfstack.h for linking
- * dynamically with the userspace rcu library.
- *
- * Copyright 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include <pthread.h>
-#include <assert.h>
-#include <poll.h>
-#include <urcu/compiler.h>
-#include <urcu/uatomic_arch.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#define CDS_WF_STACK_END ((void *)0x1UL)
-#define CDS_WFS_ADAPT_ATTEMPTS 10 /* Retry if being set */
-#define CDS_WFS_WAIT 10 /* Wait 10 ms if being set */
-
-void _cds_wfs_node_init(struct cds_wfs_node *node)
-{
- node->next = NULL;
-}
-
-void _cds_wfs_init(struct cds_wfs_stack *s)
-{
- int ret;
-
- s->head = CDS_WF_STACK_END;
- ret = pthread_mutex_init(&s->lock, NULL);
- assert(!ret);
-}
-
-void _cds_wfs_push(struct cds_wfs_stack *s, struct cds_wfs_node *node)
-{
- struct cds_wfs_node *old_head;
-
- assert(node->next == NULL);
- /*
- * uatomic_xchg() implicit memory barrier orders earlier stores to node
- * (setting it to NULL) before publication.
- */
- old_head = uatomic_xchg(&s->head, node);
- /*
- * At this point, dequeuers see a NULL node->next, they should busy-wait
- * until node->next is set to old_head.
- */
- CMM_STORE_SHARED(node->next, old_head);
-}
-
-/*
- * Returns NULL if stack is empty.
- */
-struct cds_wfs_node *
-___cds_wfs_pop_blocking(struct cds_wfs_stack *s)
-{
- struct cds_wfs_node *head, *next;
- int attempt = 0;
-
-retry:
- head = CMM_LOAD_SHARED(s->head);
- if (head == CDS_WF_STACK_END)
- return NULL;
- /*
- * Adaptative busy-looping waiting for push to complete.
- */
- while ((next = CMM_LOAD_SHARED(head->next)) == NULL) {
- if (++attempt >= CDS_WFS_ADAPT_ATTEMPTS) {
- poll(NULL, 0, CDS_WFS_WAIT); /* Wait for 10ms */
- attempt = 0;
- } else
- caa_cpu_relax();
- }
- if (uatomic_cmpxchg(&s->head, head, next) == head)
- return head;
- else
- goto retry; /* Concurrent modification. Retry. */
-}
-
-struct cds_wfs_node *
-_cds_wfs_pop_blocking(struct cds_wfs_stack *s)
-{
- struct cds_wfs_node *retnode;
- int ret;
-
- ret = pthread_mutex_lock(&s->lock);
- assert(!ret);
- retnode = ___cds_wfs_pop_blocking(s);
- ret = pthread_mutex_unlock(&s->lock);
- assert(!ret);
- return retnode;
-}
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* _URCU_WFSTACK_STATIC_H */