1 #ifndef _URCU_RCULFSTACK_STATIC_H
2 #define _URCU_RCULFSTACK_STATIC_H
7 * Userspace RCU library - Lock-Free RCU Stack
9 * Copyright 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
11 * TO BE INCLUDED ONLY IN LGPL-COMPATIBLE CODE. See rculfstack.h for linking
12 * dynamically with the userspace rcu library.
14 * This library is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU Lesser General Public
16 * License as published by the Free Software Foundation; either
17 * version 2.1 of the License, or (at your option) any later version.
19 * This library is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22 * Lesser General Public License for more details.
24 * You should have received a copy of the GNU Lesser General Public
25 * License along with this library; if not, write to the Free Software
26 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29 #include <urcu/uatomic_arch.h>
30 /* A urcu implementation header should be already included. */
36 void _cds_lfs_node_init_rcu(struct cds_lfs_node_rcu
*node
)
40 void _cds_lfs_init_rcu(struct cds_lfs_stack_rcu
*s
)
45 void _cds_lfs_push_rcu(struct cds_lfs_stack_rcu
*s
, struct cds_lfs_node_rcu
*node
)
47 struct cds_lfs_node_rcu
*head
= NULL
;
50 struct cds_lfs_node_rcu
*old_head
= head
;
54 * uatomic_cmpxchg() implicit memory barrier orders earlier
55 * stores to node before publication.
57 head
= uatomic_cmpxchg(&s
->head
, old_head
, node
);
64 * Should be called under rcu read-side lock.
66 * The caller must wait for a grace period to pass before freeing the returned
67 * node or modifying the cds_lfs_node_rcu structure.
68 * Returns NULL if stack is empty.
70 struct cds_lfs_node_rcu
*
71 _cds_lfs_pop_rcu(struct cds_lfs_stack_rcu
*s
)
74 struct cds_lfs_node_rcu
*head
;
76 head
= rcu_dereference(s
->head
);
78 struct cds_lfs_node_rcu
*next
= rcu_dereference(head
->next
);
80 if (uatomic_cmpxchg(&s
->head
, head
, next
) == head
) {
83 /* Concurrent modification. Retry. */
97 #endif /* _URCU_RCULFSTACK_STATIC_H */
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