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Subject[RFC 07/32] mars: add new module lib_pairing_heap
Date
Signed-off-by: Thomas Schoebel-Theuer <tst@schoebel-theuer.de>
---
include/linux/brick/lib_pairing_heap.h | 109 +++++++++++++++++++++++++++++++++
1 file changed, 109 insertions(+)
create mode 100644 include/linux/brick/lib_pairing_heap.h

diff --git a/include/linux/brick/lib_pairing_heap.h b/include/linux/brick/lib_pairing_heap.h
new file mode 100644
index 000000000000..9456e9ea348c
--- /dev/null
+++ b/include/linux/brick/lib_pairing_heap.h
@@ -0,0 +1,109 @@
+/*
+ * MARS Long Distance Replication Software
+ *
+ * Copyright (C) 2010-2014 Thomas Schoebel-Theuer
+ * Copyright (C) 2011-2014 1&1 Internet AG
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ */
+
+#ifndef PAIRING_HEAP_H
+#define PAIRING_HEAP_H
+
+/* Algorithm: see http://en.wikipedia.org/wiki/Pairing_heap
+ * This is just an efficient translation from recursive to iterative form.
+ *
+ * Note: find_min() is so trivial that we don't implement it.
+ */
+
+/* generic version: KEYDEF is kept separate, allowing you to
+ * embed this structure into other container structures already
+ * possessing some key (just provide an empty KEYDEF in this case).
+ */
+#define _PAIRING_HEAP_TYPEDEF(KEYTYPE, KEYDEF) \
+ \
+struct pairing_heap_##KEYTYPE { \
+ KEYDEF \
+ struct pairing_heap_##KEYTYPE *next; \
+ struct pairing_heap_##KEYTYPE *subheaps; \
+}
+
+/* less generic version: define the key inside.
+ */
+#define PAIRING_HEAP_TYPEDEF(KEYTYPE) \
+ _PAIRING_HEAP_TYPEDEF(KEYTYPE, KEYTYPE key;)
+
+/* generic methods: allow arbitrary CMP() functions.
+ */
+#define _PAIRING_HEAP_FUNCTIONS(_STATIC, KEYTYPE, CMP) \
+ \
+_STATIC \
+struct pairing_heap_##KEYTYPE *_ph_merge_##KEYTYPE( \
+struct pairing_heap_##KEYTYPE *heap1, struct pairing_heap_##KEYTYPE *heap2)\
+{ \
+ if (!heap1) \
+ return heap2; \
+ if (!heap2) \
+ return heap1; \
+ if (CMP(heap1, heap2) < 0) { \
+ heap2->next = heap1->subheaps; \
+ heap1->subheaps = heap2; \
+ return heap1; \
+ } \
+ heap1->next = heap2->subheaps; \
+ heap2->subheaps = heap1; \
+ return heap2; \
+} \
+ \
+_STATIC \
+void ph_insert_##KEYTYPE(struct pairing_heap_##KEYTYPE **heap, struct pairing_heap_##KEYTYPE *new)\
+{ \
+ new->next = NULL; \
+ new->subheaps = NULL; \
+ *heap = _ph_merge_##KEYTYPE(*heap, new); \
+} \
+ \
+_STATIC \
+void ph_delete_min_##KEYTYPE(struct pairing_heap_##KEYTYPE **heap) \
+{ \
+ struct pairing_heap_##KEYTYPE *tmplist = NULL; \
+ struct pairing_heap_##KEYTYPE *ptr; \
+ struct pairing_heap_##KEYTYPE *next; \
+ struct pairing_heap_##KEYTYPE *res; \
+ if (!*heap) { \
+ return; \
+ } \
+ for (ptr = (*heap)->subheaps; ptr; ptr = next) { \
+ struct pairing_heap_##KEYTYPE *p2 = ptr->next; \
+ next = p2; \
+ if (p2) { \
+ next = p2->next; \
+ ptr = _ph_merge_##KEYTYPE(ptr, p2); \
+ } \
+ ptr->next = tmplist; \
+ tmplist = ptr; \
+ } \
+ res = NULL; \
+ for (ptr = tmplist; ptr; ptr = next) { \
+ next = ptr->next; \
+ res = _ph_merge_##KEYTYPE(res, ptr); \
+ } \
+ *heap = res; \
+}
+
+/* some default CMP() function */
+#define PAIRING_HEAP_COMPARE(a, b) ((a)->key < (b)->key ? -1 : ((a)->key > (b)->key ? 1 : 0))
+
+/* less generic version: use the default CMP() function */
+#define PAIRING_HEAP_FUNCTIONS(_STATIC, KEYTYPE) \
+ _PAIRING_HEAP_FUNCTIONS(_STATIC, KEYTYPE, PAIRING_HEAP_COMPARE)
+
+#endif
--
2.11.0
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