[t:3856] added a test for the memory leak in prefetching bfes. and now, to...

[t:3856] added a test for the memory leak in prefetching bfes.  and now, to trac, I say: fix #3856 Huzzah! Huzzah! Huzzah!

git-svn-id: file:///svn/toku/tokudb@33899 c7de825b-a66e-492c-adef-691d508d4ae1

newbrt/tests/test3856.c

+/* -*- mode: C; c-basic-offset: 4 -*- */
+#ident "$Id$"
+#ident "Copyright (c) 2007-2011 Tokutek Inc.  All rights reserved."
+
+// it used to be the case that we copied the left and right keys of a
+// range to be prelocked but never freed them, this test checks that they
+// are freed (as of this time, this happens in destroy_bfe_for_prefetch)
+
+#include "test.h"
+
+#include "includes.h"
+
+static const char fname[]= __FILE__ ".brt";
+
+static TOKUTXN const null_txn = 0;
+static DB * const null_db = 0;
+static int const nodesize = 1<<12, basementnodesize = 1<<9;
+static int const count = 1000;
+
+static int
+string_cmp(DB *UU(db), const DBT *a, const DBT *b)
+{
+    return strcmp(a->data, b->data);
+}
+
+static int
+found(ITEMLEN UU(keylen), bytevec key, ITEMLEN UU(vallen), bytevec UU(val), void *UU(extra))
+{
+    assert(key != NULL);
+    return 0;
+}
+
+int
+test_main (int argc __attribute__((__unused__)), const char *argv[] __attribute__((__unused__))) {
+    toku_memory_check = 1;
+
+    CACHETABLE ct;
+    BRT t;
+
+    int r = toku_brt_create_cachetable(&ct, 0, ZERO_LSN, NULL_LOGGER); assert(r==0);
+    unlink(fname);
+    r = toku_open_brt(fname, 1, &t, nodesize, basementnodesize, ct, null_txn, string_cmp, null_db); assert(r==0);
+
+    for (int i = 0; i < count; ++i) {
+        char key[100],val[100];
+        DBT k,v;
+        snprintf(key, 100, "hello%d", i);
+        snprintf(val, 100, "there%d", i);
+        r = toku_brt_insert(t, toku_fill_dbt(&k, key, 1+strlen(key)), toku_fill_dbt(&v, val, 1+strlen(val)), null_txn);
+        assert(r==0);
+    }
+    r = toku_close_brt(t, 0); assert(r == 0);
+    r = toku_cachetable_close(&ct); assert(r == 0);
+
+    r = toku_brt_create_cachetable(&ct, 0, ZERO_LSN, NULL_LOGGER); assert(r == 0);
+    r = toku_open_brt(fname, 1, &t, nodesize, basementnodesize, ct, null_txn, string_cmp, null_db); assert(r == 0);
+
+    for (int n = 0; n < count/100; ++n) {
+        int i = n * 100;
+        BRT_CURSOR c;
+        char lkey[100],rkey[100];
+        DBT lk, rk;
+        r = toku_brt_cursor(t, &c, null_txn, FALSE); assert(r == 0);
+        snprintf(lkey, 100, "hello%d", i);
+        snprintf(rkey, 100, "hello%d", i + 100);
+        toku_brt_cursor_set_range_lock(c, toku_fill_dbt(&lk, lkey, 1+strlen(lkey)),
+                                       toku_fill_dbt(&rk, rkey, 1+strlen(rkey)),
+                                       FALSE, FALSE);
+        r = toku_brt_cursor_set(c, &lk, found, NULL); assert(r == 0);
+        for (int j = 0; j < 100; ++j) {
+            r = toku_brt_cursor_next(c, found, NULL); assert(r == 0);
+        }
+        r = toku_brt_cursor_close(c); assert(r == 0);
+    }
+
+    r = toku_close_brt(t, 0); assert(r == 0);
+    r = toku_cachetable_close(&ct), assert(r == 0);
+
+    return 0;
+}