summaryrefslogtreecommitdiffstats
path: root/src
diff options
context:
space:
mode:
authorQuincey Koziol <koziol@hdfgroup.org>2005-02-17 00:37:04 (GMT)
committerQuincey Koziol <koziol@hdfgroup.org>2005-02-17 00:37:04 (GMT)
commit27dbdb8c7197b30c2683f4be2b9ef7b703d81d5f (patch)
tree36a72b479a22979060a6ccd4b663ccc0cb0cafc9 /src
parenta68c4c7981ba4224e72f64556483f3707be94ffc (diff)
downloadhdf5-27dbdb8c7197b30c2683f4be2b9ef7b703d81d5f.zip
hdf5-27dbdb8c7197b30c2683f4be2b9ef7b703d81d5f.tar.gz
hdf5-27dbdb8c7197b30c2683f4be2b9ef7b703d81d5f.tar.bz2
[svn-r10020] Purpose:
New feature Description: Add code to iterate over all the records in a v2 B-tree. Platforms tested: FreeBSD 4.11 (sleipnir) Solaris 2.9 (shanti)
Diffstat (limited to 'src')
-rw-r--r--src/H5B2.c176
-rw-r--r--src/H5B2private.h18
2 files changed, 188 insertions, 6 deletions
diff --git a/src/H5B2.c b/src/H5B2.c
index d24f6eb..35b806f 100644
--- a/src/H5B2.c
+++ b/src/H5B2.c
@@ -69,6 +69,9 @@ static herr_t H5B2_split2(H5F_t *f, hid_t dxpl_id, unsigned depth,
H5B2_internal_t *internal, unsigned idx);
static herr_t H5B2_redistribute3(H5F_t *f, hid_t dxpl_id, unsigned depth,
H5B2_internal_t *internal, unsigned idx);
+static herr_t H5B2_iterate_node(H5F_t *f, hid_t dxpl_id, H5RC_t *bt2_shared,
+ unsigned depth, const H5B2_node_ptr_t *curr_node, H5B2_operator_t op,
+ void *op_data);
/* Package variables */
@@ -1630,3 +1633,176 @@ done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5B2_create_internal() */
+
+/*-------------------------------------------------------------------------
+ * Function: H5B2_iterate_node
+ *
+ * Purpose: Iterate over all the records from a B-tree node, in "in-order"
+ * order, making a callback for each record.
+ *
+ * If the callback returns non-zero, the iteration breaks out
+ * without finishing all the records.
+ *
+ * Return: Value from callback, non-negative on success, negative on error
+ *
+ * Programmer: Quincey Koziol
+ * koziol@ncsa.uiuc.edu
+ * Feb 11 2005
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5B2_iterate_node(H5F_t *f, hid_t dxpl_id, H5RC_t *bt2_shared, unsigned depth,
+ const H5B2_node_ptr_t *curr_node, H5B2_operator_t op, void *op_data)
+{
+ H5B2_shared_t *shared; /* Pointer to B-tree's shared information */
+ const H5AC_class_t *curr_node_class=NULL; /* Pointer to current node's class info */
+ void *node=NULL; /* Pointers to current node */
+ uint8_t *native; /* Pointers to node's native records */
+ H5B2_node_ptr_t *node_ptrs=NULL; /* Pointers to node's node pointers */
+ unsigned u; /* Local index */
+ herr_t ret_value = H5B2_ITER_CONT;
+
+ FUNC_ENTER_NOAPI(H5B2_iterate_node, FAIL)
+
+ /* Check arguments. */
+ HDassert(f);
+ HDassert(bt2_shared);
+ HDassert(curr_node);
+ HDassert(op);
+
+ /* Get the pointer to the shared B-tree info */
+ shared=H5RC_GET_OBJ(bt2_shared);
+ HDassert(shared);
+
+ if(depth>0) {
+ H5B2_internal_t *internal; /* Pointer to internal node */
+
+ /* Lock the current B-tree node */
+ if (NULL == (internal = H5AC_protect(f, dxpl_id, H5AC_BT2_INT, curr_node->addr, &(curr_node->node_nrec), shared, H5AC_WRITE)))
+ HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree internal node")
+
+ /* Set up information about current node */
+ curr_node_class = H5AC_BT2_INT;
+ node = internal;
+ native = internal->int_native;
+ node_ptrs = internal->node_ptrs;
+ } /* end if */
+ else {
+ H5B2_leaf_t *leaf; /* Pointer to leaf node */
+
+ /* Lock the current B-tree node */
+ if (NULL == (leaf = H5AC_protect(f, dxpl_id, H5AC_BT2_LEAF, curr_node->addr, &(curr_node->node_nrec), shared, H5AC_WRITE)))
+ HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree leaf node")
+
+ /* Set up information about current node */
+ curr_node_class = H5AC_BT2_LEAF;
+ node = leaf;
+ native = leaf->leaf_native;
+ } /* end else */
+
+ /* Iterate through records */
+ for(u=0, ret_value; u<curr_node->node_nrec && !ret_value; u++) {
+ /* Descend into child node, if current node is an internal node */
+ if(depth>0) {
+ if((ret_value = H5B2_iterate_node(f,dxpl_id,bt2_shared,depth-1,&(node_ptrs[u]),op,op_data))<0)
+ HGOTO_ERROR(H5E_BTREE, H5E_CANTINIT, FAIL, "node iteration failed")
+ } /* end if */
+
+ /* Make callback for current record */
+ if ((ret_value = (op)(H5B2_NAT_NREC(native,shared,u), op_data)) <0)
+ HGOTO_ERROR(H5E_BTREE, H5E_CANTINIT, FAIL, "iterator function failed")
+ } /* end for */
+
+ /* Descend into last child node, if current node is an internal node */
+ if(depth>0) {
+ if((ret_value = H5B2_iterate_node(f,dxpl_id,bt2_shared,depth-1,&(node_ptrs[u]),op,op_data))<0)
+ HGOTO_ERROR(H5E_BTREE, H5E_CANTINIT, FAIL, "node iteration failed")
+ } /* end if */
+
+done:
+ /* Unlock current node */
+ if(node)
+ if (H5AC_unprotect(f, dxpl_id, curr_node_class, curr_node->addr, node, H5AC__NO_FLAGS_SET) < 0)
+ HDONE_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree node")
+
+ FUNC_LEAVE_NOAPI(ret_value)
+} /* H5B2_iterate_node() */
+
+
+/*-------------------------------------------------------------------------
+ * Function: H5B2_iterate
+ *
+ * Purpose: Iterate over all the records in the B-tree, in "in-order"
+ * order, making a callback for each record.
+ *
+ * If the callback returns non-zero, the iteration breaks out
+ * without finishing all the records.
+ *
+ * Return: Value from callback, non-negative on success, negative on error
+ *
+ * Programmer: Quincey Koziol
+ * koziol@ncsa.uiuc.edu
+ * Feb 11 2005
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5B2_iterate(H5F_t *f, hid_t dxpl_id, const H5B2_class_t *type, haddr_t addr,
+ H5B2_operator_t op, void *op_data)
+{
+ H5B2_t *bt2=NULL; /* Pointer to the B-tree header */
+ H5RC_t *bt2_shared=NULL; /* Pointer to ref-counter for shared B-tree info */
+ hbool_t incr_rc=FALSE; /* Flag to indicate that we've incremented the B-tree's shared info reference count */
+ H5B2_shared_t *shared; /* Pointer to B-tree's shared information */
+ H5B2_node_ptr_t root_ptr; /* Node pointer info for root node */
+ unsigned depth; /* Current depth of the tree */
+ herr_t ret_value = SUCCEED;
+
+ FUNC_ENTER_NOAPI(H5B2_iterate, FAIL)
+
+ /* Check arguments. */
+ HDassert(f);
+ HDassert(type);
+ HDassert(H5F_addr_defined(addr));
+ HDassert(op);
+
+ /* Look up the B-tree header */
+ if (NULL == (bt2 = H5AC_protect(f, dxpl_id, H5AC_BT2_HDR, addr, type, NULL, H5AC_WRITE)))
+ HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree header")
+
+ /* Get the pointer to the shared B-tree info */
+ shared=H5RC_GET_OBJ(bt2->shared);
+ HDassert(shared);
+
+ /* Safely grab pointer to reference counted shared B-tree info, so we can release the B-tree header if necessary */
+ bt2_shared=bt2->shared;
+ H5RC_INC(bt2_shared);
+ incr_rc=TRUE;
+
+ /* Make copy of the root node pointer */
+ root_ptr = bt2->root;
+
+ /* Current depth of the tree */
+ depth=bt2->depth;
+
+ /* Release header */
+ if (H5AC_unprotect(f, dxpl_id, H5AC_BT2_HDR, addr, bt2, H5AC__NO_FLAGS_SET) < 0)
+ HGOTO_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree header info")
+ bt2=NULL;
+
+ /* Iterate through records */
+ if(root_ptr.node_nrec>0) {
+ /* Iterate through nodes */
+ if((ret_value=H5B2_iterate_node(f,dxpl_id,bt2_shared,depth,&root_ptr,op,op_data))<0)
+ HGOTO_ERROR(H5E_BTREE, H5E_CANTINIT, FAIL, "node iteration failed")
+ } /* end if */
+
+done:
+ /* Check if we need to decrement the reference count for the B-tree's shared info */
+ if(incr_rc)
+ H5RC_DEC(bt2_shared);
+
+ FUNC_LEAVE_NOAPI(ret_value)
+} /* H5B2_iterate() */
+
diff --git a/src/H5B2private.h b/src/H5B2private.h
index 51b5c2d..457d12a 100644
--- a/src/H5B2private.h
+++ b/src/H5B2private.h
@@ -36,13 +36,17 @@
/* Library Private Macros */
/**************************/
-/*
- * Feature: Define this constant if you want to check B-tree consistency
- * after each B-tree operation. Note that this slows down the
- * library considerably! Debugging the B-tree depends on assert()
- * being enabled.
+/* Define return values from operator callback function for H5B2_iterate */
+/* (Actually, any positive value will cause the iterator to stop and pass back
+ * that positive value to the function that called the iterator)
*/
-/* #define H5B2_DEBUG */
+#define H5B2_ITER_ERROR (-1)
+#define H5B2_ITER_CONT (0)
+#define H5B2_ITER_STOP (1)
+
+/* Define the operator callback function pointer for H5B2_iterate() */
+typedef int (*H5B2_operator_t)(const void *record, void *op_data);
+
/****************************/
/* Library Private Typedefs */
@@ -88,6 +92,8 @@ H5_DLL herr_t H5B2_create(H5F_t *f, hid_t dxpl_id, const H5B2_class_t *type,
haddr_t *addr_p);
H5_DLL herr_t H5B2_insert(H5F_t *f, hid_t dxpl_id, const H5B2_class_t *type,
haddr_t addr, void *udata);
+H5_DLL herr_t H5B2_iterate(H5F_t *f, hid_t dxpl_id, const H5B2_class_t *type,
+ haddr_t addr, H5B2_operator_t op, void *op_data);
#endif /* _H5B2private_H */