diff options
Diffstat (limited to 'erts/emulator/sys/common/erl_util_queue.h')
-rw-r--r-- | erts/emulator/sys/common/erl_util_queue.h | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/erts/emulator/sys/common/erl_util_queue.h b/erts/emulator/sys/common/erl_util_queue.h new file mode 100644 index 0000000000..47925e2264 --- /dev/null +++ b/erts/emulator/sys/common/erl_util_queue.h @@ -0,0 +1,77 @@ +/* + * %CopyrightBegin% + * + * Copyright Ericsson AB 2013. All Rights Reserved. + * + * The contents of this file are subject to the Erlang Public License, + * Version 1.1, (the "License"); you may not use this file except in + * compliance with the License. You should have received a copy of the + * Erlang Public License along with this software. If not, it can be + * retrieved online at http://www.erlang.org/. + * + * Software distributed under the License is distributed on an "AS IS" + * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See + * the License for the specific language governing rights 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 |