urcu/rculfstack.h

   1 #ifndef _URCU_RCULFSTACK_H
   2 #define _URCU_RCULFSTACK_H
   3
   4 /*
   5  * rculfstack.h
   6  *
   7  * Userspace RCU library - Lock-Free RCU Stack
   8  *
   9  * Copyright 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  10  *
  11  * This library is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU Lesser General Public
  13  * License as published by the Free Software Foundation; either
  14  * version 2.1 of the License, or (at your option) any later version.
  15  *
  16  * This library is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * Lesser General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU Lesser General Public
  22  * License along with this library; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  24  */
  25
  26 #ifdef __cplusplus
  27 extern "C" {
  28 #endif
  29
  30 struct cds_lfs_node_rcu {
  31         struct cds_lfs_node_rcu *next;
  32 };
  33
  34 struct cds_lfs_stack_rcu {
  35         struct cds_lfs_node_rcu *head;
  36 };
  37
  38 #ifdef _LGPL_SOURCE
  39
  40 #include <urcu/static/rculfstack.h>
  41
  42 #define cds_lfs_node_init_rcu           _cds_lfs_node_init_rcu
  43 #define cds_lfs_init_rcu                _cds_lfs_init_rcu
  44 #define cds_lfs_push_rcu                _cds_lfs_push_rcu
  45 #define cds_lfs_pop_rcu                 _cds_lfs_pop_rcu
  46
  47 #else /* !_LGPL_SOURCE */
  48
  49 extern void cds_lfs_node_init_rcu(struct cds_lfs_node_rcu *node);
  50 extern void cds_lfs_init_rcu(struct cds_lfs_stack_rcu *s);
  51 extern int cds_lfs_push_rcu(struct cds_lfs_stack_rcu *s,
  52                         struct cds_lfs_node_rcu *node);
  53
  54 /*
  55  * Should be called under rcu read lock critical section.
  56  *
  57  * The caller must wait for a grace period to pass before freeing the returned
  58  * node or modifying the cds_lfs_node_rcu structure.
  59  * Returns NULL if stack is empty.
  60  */
  61 extern struct cds_lfs_node_rcu *cds_lfs_pop_rcu(struct cds_lfs_stack_rcu *s);
  62
  63 #endif /* !_LGPL_SOURCE */
  64
  65 #ifdef __cplusplus
  66 }
  67 #endif
  68
  69 #endif /* _URCU_RCULFSTACK_H */