urcu/rculfqueue.h

   1 #ifndef _URCU_RCULFQUEUE_H
   2 #define _URCU_RCULFQUEUE_H
   3
   4 /*
   5  * rculfqueue.h
   6  *
   7  * Userspace RCU library - Lock-Free RCU Queue
   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 #include <assert.h>
  27 #include <urcu-call-rcu.h>
  28
  29 #ifdef __cplusplus
  30 extern "C" {
  31 #endif
  32
  33 struct cds_lfq_queue_rcu;
  34
  35 struct cds_lfq_node_rcu {
  36         struct cds_lfq_node_rcu *next;
  37         int dummy;
  38 };
  39
  40 struct cds_lfq_queue_rcu {
  41         struct cds_lfq_node_rcu *head, *tail;
  42 };
  43
  44 #ifdef _LGPL_SOURCE
  45
  46 #include <urcu/static/rculfqueue.h>
  47
  48 #define cds_lfq_node_init_rcu_qsbr      _cds_lfq_node_init_rcu
  49 #define cds_lfq_init_rcu_qsbr           _cds_lfq_init_rcu
  50 #define cds_lfq_destroy_rcu_qsbr        _cds_lfq_destroy_rcu
  51 #define cds_lfq_enqueue_rcu_qsbr        _cds_lfq_enqueue_rcu
  52 #define cds_lfq_dequeue_rcu_qsbr        _cds_lfq_dequeue_rcu
  53
  54 #define cds_lfq_node_init_rcu_bp        _cds_lfq_node_init_rcu
  55 #define cds_lfq_init_rcu_bp             _cds_lfq_init_rcu
  56 #define cds_lfq_destroy_rcu_bp          _cds_lfq_destroy_rcu
  57 #define cds_lfq_enqueue_rcu_bp          _cds_lfq_enqueue_rcu
  58 #define cds_lfq_dequeue_rcu_bp          _cds_lfq_dequeue_rcu
  59
  60 #define cds_lfq_node_init_rcu_memb      _cds_lfq_node_init_rcu
  61 #define cds_lfq_init_rcu_memb           _cds_lfq_init_rcu
  62 #define cds_lfq_destroy_rcu_memb        _cds_lfq_destroy_rcu
  63 #define cds_lfq_enqueue_rcu_memb        _cds_lfq_enqueue_rcu
  64 #define cds_lfq_dequeue_rcu_memb        _cds_lfq_dequeue_rcu
  65
  66 #define cds_lfq_node_init_rcu_mb        _cds_lfq_node_init_rcu
  67 #define cds_lfq_init_rcu_mb             _cds_lfq_init_rcu
  68 #define cds_lfq_destroy_rcu_mb          _cds_lfq_destroy_rcu
  69 #define cds_lfq_enqueue_rcu_mb          _cds_lfq_enqueue_rcu
  70 #define cds_lfq_dequeue_rcu_mb          _cds_lfq_dequeue_rcu
  71
  72 #define cds_lfq_node_init_rcu_sig       _cds_lfq_node_init_rcu
  73 #define cds_lfq_init_rcu_sig            _cds_lfq_init_rcu
  74 #define cds_lfq_destroy_rcu_sig         _cds_lfq_destroy_rcu
  75 #define cds_lfq_enqueue_rcu_sig         _cds_lfq_enqueue_rcu
  76 #define cds_lfq_dequeue_rcu_sig         _cds_lfq_dequeue_rcu
  77
  78 #else /* !_LGPL_SOURCE */
  79
  80 extern void cds_lfq_node_init_rcu(struct cds_lfq_node_rcu *node);
  81 extern void cds_lfq_init_rcu(struct cds_lfq_queue_rcu *q);
  82 /*
  83  * The queue should be emptied before calling destroy.
  84  *
  85  * Return 0 on success, -EPERM if queue is not empty.
  86  */
  87 extern int cds_lfq_destroy_rcu(struct cds_lfq_queue_rcu *q);
  88
  89 /*
  90  * Acts as a RCU reader.
  91  */
  92 extern void cds_lfq_enqueue_rcu(struct cds_lfq_queue_rcu *q,
  93                                 struct cds_lfq_node_rcu *node);
  94
  95 /*
  96  * Acts as a RCU reader.
  97  *
  98  * The caller must wait for a grace period to pass before freeing the returned
  99  * node or modifying the cds_lfq_node_rcu structure.
 100  * Returns NULL if queue is empty.
 101  */
 102 extern
 103 struct cds_lfq_node_rcu *cds_lfq_dequeue_rcu(struct cds_lfq_queue_rcu *q);
 104
 105 #endif /* !_LGPL_SOURCE */
 106
 107 #ifdef __cplusplus
 108 }
 109 #endif
 110
 111 #endif /* _URCU_RCULFQUEUE_H */