diff options
Diffstat (limited to 'Utilities/cmlibuv/src/queue.h')
| -rw-r--r-- | Utilities/cmlibuv/src/queue.h | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/Utilities/cmlibuv/src/queue.h b/Utilities/cmlibuv/src/queue.h new file mode 100644 index 0000000..ff3540a --- /dev/null +++ b/Utilities/cmlibuv/src/queue.h @@ -0,0 +1,108 @@ +/* Copyright (c) 2013, Ben Noordhuis <info@bnoordhuis.nl> + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#ifndef QUEUE_H_ +#define QUEUE_H_ + +#include <stddef.h> + +typedef void *QUEUE[2]; + +/* Private macros. */ +#define QUEUE_NEXT(q) (*(QUEUE **) &((*(q))[0])) +#define QUEUE_PREV(q) (*(QUEUE **) &((*(q))[1])) +#define QUEUE_PREV_NEXT(q) (QUEUE_NEXT(QUEUE_PREV(q))) +#define QUEUE_NEXT_PREV(q) (QUEUE_PREV(QUEUE_NEXT(q))) + +/* Public macros. */ +#define QUEUE_DATA(ptr, type, field) \ + ((type *) ((char *) (ptr) - offsetof(type, field))) + +/* Important note: mutating the list while QUEUE_FOREACH is + * iterating over its elements results in undefined behavior. + */ +#define QUEUE_FOREACH(q, h) \ + for ((q) = QUEUE_NEXT(h); (q) != (h); (q) = QUEUE_NEXT(q)) + +#define QUEUE_EMPTY(q) \ + ((const QUEUE *) (q) == (const QUEUE *) QUEUE_NEXT(q)) + +#define QUEUE_HEAD(q) \ + (QUEUE_NEXT(q)) + +#define QUEUE_INIT(q) \ + do { \ + QUEUE_NEXT(q) = (q); \ + QUEUE_PREV(q) = (q); \ + } \ + while (0) + +#define QUEUE_ADD(h, n) \ + do { \ + QUEUE_PREV_NEXT(h) = QUEUE_NEXT(n); \ + QUEUE_NEXT_PREV(n) = QUEUE_PREV(h); \ + QUEUE_PREV(h) = QUEUE_PREV(n); \ + QUEUE_PREV_NEXT(h) = (h); \ + } \ + while (0) + +#define QUEUE_SPLIT(h, q, n) \ + do { \ + QUEUE_PREV(n) = QUEUE_PREV(h); \ + QUEUE_PREV_NEXT(n) = (n); \ + QUEUE_NEXT(n) = (q); \ + QUEUE_PREV(h) = QUEUE_PREV(q); \ + QUEUE_PREV_NEXT(h) = (h); \ + QUEUE_PREV(q) = (n); \ + } \ + while (0) + +#define QUEUE_MOVE(h, n) \ + do { \ + if (QUEUE_EMPTY(h)) \ + QUEUE_INIT(n); \ + else { \ + QUEUE* q = QUEUE_HEAD(h); \ + QUEUE_SPLIT(h, q, n); \ + } \ + } \ + while (0) + +#define QUEUE_INSERT_HEAD(h, q) \ + do { \ + QUEUE_NEXT(q) = QUEUE_NEXT(h); \ + QUEUE_PREV(q) = (h); \ + QUEUE_NEXT_PREV(q) = (q); \ + QUEUE_NEXT(h) = (q); \ + } \ + while (0) + +#define QUEUE_INSERT_TAIL(h, q) \ + do { \ + QUEUE_NEXT(q) = (h); \ + QUEUE_PREV(q) = QUEUE_PREV(h); \ + QUEUE_PREV_NEXT(q) = (q); \ + QUEUE_PREV(h) = (q); \ + } \ + while (0) + +#define QUEUE_REMOVE(q) \ + do { \ + QUEUE_PREV_NEXT(q) = QUEUE_NEXT(q); \ + QUEUE_NEXT_PREV(q) = QUEUE_PREV(q); \ + } \ + while (0) + +#endif /* QUEUE_H_ */ |