+// SPDX-FileCopyrightText: 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+//
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
#ifndef _URCU_LFSTACK_H
#define _URCU_LFSTACK_H
/*
- * lfstack.h
- *
* Userspace RCU library - Lock-Free Stack
- *
- * Copyright 2010-2012 - 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
*/
#ifdef __cplusplus
struct __cds_lfs_stack *_s;
struct cds_lfs_stack *s;
} __attribute__((__transparent_union__)) cds_lfs_stack_ptr_t;
+
+typedef union {
+ const struct __cds_lfs_stack *_s;
+ const struct cds_lfs_stack *s;
+} __attribute__((__transparent_union__)) cds_lfs_stack_const_ptr_t;
#if defined(__clang__)
#pragma clang diagnostic pop
#endif
*
* No memory barrier is issued. No mutual exclusion is required.
*/
-extern bool cds_lfs_empty(cds_lfs_stack_ptr_t s);
+extern bool cds_lfs_empty(cds_lfs_stack_const_ptr_t s);
/*
* cds_lfs_push: push a node into the stack.
return ret;
}
+static inline cds_lfs_stack_const_ptr_t cds_lfs_stack_const_cast(const struct __cds_lfs_stack *s)
+{
+ cds_lfs_stack_const_ptr_t ret = {
+ ._s = s,
+ };
+ return ret;
+}
+
+static inline cds_lfs_stack_const_ptr_t cds_lfs_stack_const_cast(const struct cds_lfs_stack *s)
+{
+ cds_lfs_stack_const_ptr_t ret = {
+ .s = s,
+ };
+ return ret;
+}
+
template<typename T> static inline bool cds_lfs_empty(T s)
{
- return cds_lfs_empty(cds_lfs_stack_cast(s));
+ return cds_lfs_empty(cds_lfs_stack_const_cast(s));
}
template<typename T> static inline bool cds_lfs_push(T s,