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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2013-2016. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
#ifndef ERL_UTIL_QUEUE_H_
#define ERL_UTIL_QUEUE_H_
#define erts_circleq_head(Q) ((Q)->next)
#define erts_circleq_tail(Q) ((Q)->prev)
#define erts_circleq_next(Q) ((Q)->next)
#define erts_circleq_prev(Q) ((Q)->prev)
#define erts_circleq_is_empty(Q) ((Q)->next == (void *)(Q))
#define erts_circleq_remove(N) \
do { \
(N)->next->prev = (N)->prev; \
(N)->prev->next = (N)->next; \
(N)->next = (N); \
(N)->prev = (N); \
} while(0)
#define erts_circleq_pop_head(Q, N) \
do { \
(N) = (Q)->next; \
(N)->next->prev = (N)->prev; \
(N)->prev->next = (N)->next; \
(N)->next = (N); \
(N)->prev = (N); \
} while(0)
#define erts_circleq_pop_tail(Q, N) \
do { \
(N) = (Q)->prev; \
(N)->next->prev = (N)->prev; \
(N)->prev->next = (N)->next; \
(N)->next = (N); \
(N)->prev = (N); \
} while(0)
#define erts_circleq_push_head(Q, N) \
do { \
(N)->next = (Q)->next; \
(N)->prev = (void *)(Q); \
(Q)->next->prev = (N); \
(Q)->next = (N); \
} while(0)
#define erts_circleq_push_tail(Q, N) \
do { \
(N)->prev = (Q)->prev; \
(N)->next = (void *)(Q); \
(Q)->prev->next = (N); \
(Q)->prev = (N); \
} while(0)
#define erts_circleq_foreach(V, Q) \
for ((V) = (Q)->next; (V) != (const void *)(Q); (V) = (V)->next)
#define erts_circleq_foreach_reverse(V, Q) \
for ((V) = (Q)->prev; (V) != (const void *)(Q); (V) = (V)->prev)
#endif
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