Merge pull request #4420 from sipa/skiplist

Add a skiplist to the CBlockIndex structure.

1 files changed, 45 insertions, 0 deletions

diff --git a/src/test/skiplist_tests.cpp b/src/test/skiplist_tests.cpp
new file mode 100644
index 0000000000..ea301685c9
--- /dev/null
+++ b/src/test/skiplist_tests.cpp
@@ -0,0 +1,45 @@
+// Copyright (c) 2014 The Bitcoin Core developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <boost/test/unit_test.hpp>
+#include <vector>
+#include "main.h"
+#include "util.h"
+
+
+#define SKIPLIST_LENGTH 300000
+
+BOOST_AUTO_TEST_SUITE(skiplist_tests)
+
+BOOST_AUTO_TEST_CASE(skiplist_test)
+{
+    std::vector<CBlockIndex> vIndex(SKIPLIST_LENGTH);
+
+    for (int i=0; i<SKIPLIST_LENGTH; i++) {
+        vIndex[i].nHeight = i;
+        vIndex[i].pprev = (i == 0) ? NULL : &vIndex[i - 1];
+        vIndex[i].BuildSkip();
+    }
+
+    for (int i=0; i<SKIPLIST_LENGTH; i++) {
+        if (i > 0) {
+            BOOST_CHECK(vIndex[i].pskip == &vIndex[vIndex[i].pskip->nHeight]);
+            BOOST_CHECK(vIndex[i].pskip->nHeight < i);
+        } else {
+            BOOST_CHECK(vIndex[i].pskip == NULL);
+        }
+    }
+
+    for (int i=0; i < 1000; i++) {
+        int from = insecure_rand() % (SKIPLIST_LENGTH - 1);
+        int to = insecure_rand() % (from + 1);
+
+        BOOST_CHECK(vIndex[SKIPLIST_LENGTH - 1].GetAncestor(from) == &vIndex[from]);
+        BOOST_CHECK(vIndex[from].GetAncestor(to) == &vIndex[to]);
+        BOOST_CHECK(vIndex[from].GetAncestor(0) == &vIndex[0]);
+    }
+}
+
+BOOST_AUTO_TEST_SUITE_END()
+