Addresses #288

Exercise buffer increase and decrease.

git-svn-id: file:///svn/tokudb@1910 c7de825b-a66e-492c-adef-691d508d4ae1

src/range_tree/tests/test_00025_memalloc.c

+/* We are going to test whether we can manage memory once we do lots of 
+   insert and delete. */
+
+#include "test.h"
+
+unsigned malloc_cnt;
+unsigned malloc_cntl;
+
+/* Controllable malloc failure: it fails only the ith time it is invoked */
+static void* malloc_fail(size_t size) {
+    if (malloc_cntl == ++malloc_cnt) {
+        errno = ENOMEM;
+        return NULL;
+    } else 
+        return malloc(size);
+}
+
+int main(int argc, const char *argv[]) {
+    int i, j;
+    int r;
+    toku_range_tree *tree;
+    toku_range range;
+    int nums[1024];
+    char letters[2] = {'A','B'};
+
+    for (i = 0; i < 1024; i++)
+      nums[i] = i;
+
+    parse_args(argc, argv);
+
+    /* Insert and delete lots of ranges to force memory increase and decrease */
+
+    r = toku_rt_create(&tree, int_cmp, char_cmp, TRUE, malloc, free, realloc);
+    CKERR(r);
+
+    /* Insert lots of ranges */
+    for (i = 0; i < 512; i++) {
+      j = i + i;
+      range.left  = &nums[j];
+      range.right = &nums[j+1];
+      range.data  = &letters[0];
+      r = toku_rt_insert(tree, &range);   CKERR(r);
+    }
+
+    /* Decrease lots of ranges */
+    for (i = 0; i < 512; i++) {
+      j = i + i;
+      range.left  = &nums[j];
+      range.right = &nums[j+1];
+      range.data  = &letters[0];
+      r = toku_rt_delete(tree, &range);   CKERR(r);
+    }
+
+    r = toku_rt_close(tree);            CKERR(r);
+
+    tree = NULL;
+
+
+    /* Force malloc to fail */
+
+    /* Failure when allocating the tree */
+    malloc_cnt  = 0;
+    malloc_cntl = 1;
+    r = toku_rt_create(&tree, int_cmp, char_cmp, TRUE, malloc_fail, free, 
+                       realloc);
+    CKERR2(r, ENOMEM);
+
+    /* Failure when allocating the tree ranges */
+    malloc_cnt  = 0;
+    malloc_cntl = 2;
+    r = toku_rt_create(&tree, int_cmp, char_cmp, TRUE, malloc_fail, free, 
+                       realloc);
+    CKERR2(r, ENOMEM);
+
+    return 0;
+}