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mdbx: Merge branch 'devel' into 'pt' branch.

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Leo Yuriev
2016-12-23 05:03:27 +03:00
parent ef375647c7 bb7d3b4639
commit 68cac36832
3 changed files with 25 additions and 10 deletions
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21
mdb.c
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@@ -614,19 +614,26 @@ typedef struct MDB_page {
/** Header for a single key/data pair within a page.
* Used in pages of type #P_BRANCH and #P_LEAF without #P_LEAF2.
* We guarantee 2-byte alignment for 'MDB_node's.
*
* #mn_lo and #mn_hi are used for data size on leaf nodes, and for child
* pgno on branch nodes. On 64 bit platforms, #mn_flags is also used
* for pgno. (Branch nodes have no flags). Lo and hi are in host byte
* order in case some accesses can be optimized to 32-bit word access.
*
* Leaf node flags describe node contents. #F_BIGDATA says the node's
* data part is the page number of an overflow page with actual data.
* #F_DUPDATA and #F_SUBDATA can be combined giving duplicate data in
* a sub-page/sub-database, and named databases (just #F_SUBDATA).
*/
typedef struct MDB_node {
/** lo and hi are used for data size on leaf nodes and for
* child pgno on branch nodes. On 64 bit platforms, flags
* is also used for pgno. (Branch nodes have no flags).
* They are in host byte order in case that lets some
* accesses be optimized into a 32-bit word access.
*/
/** part of data size or pgno
* @{ */
#if BYTE_ORDER == LITTLE_ENDIAN
unsigned short mn_lo, mn_hi; /**< part of data size or pgno */
unsigned short mn_lo, mn_hi;
#else
unsigned short mn_hi, mn_lo;
#endif
/** @} */
/** @defgroup mdb_node Node Flags
* @ingroup internal
* Flags for node headers.