diff options
Diffstat (limited to 'external/db_drivers/liblmdb/lmdb.h')
| -rw-r--r-- | external/db_drivers/liblmdb/lmdb.h | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/external/db_drivers/liblmdb/lmdb.h b/external/db_drivers/liblmdb/lmdb.h index d616cabf9..a794c9f7d 100644 --- a/external/db_drivers/liblmdb/lmdb.h +++ b/external/db_drivers/liblmdb/lmdb.h @@ -78,6 +78,11 @@ * access to locks and lock file. Exceptions: On read-only filesystems * or with the #MDB_NOLOCK flag described under #mdb_env_open(). * + * - An LMDB configuration will often reserve considerable \b unused + * memory address space and maybe file size for future growth. + * This does not use actual memory or disk space, but users may need + * to understand the difference so they won't be scared off. + * * - By default, in versions before 0.9.10, unused portions of the data * file might receive garbage data from memory freed by other code. * (This does not happen when using the #MDB_WRITEMAP flag.) As of @@ -130,7 +135,7 @@ * * @author Howard Chu, Symas Corporation. * - * @copyright Copyright 2011-2015 Howard Chu, Symas Corp. All rights reserved. + * @copyright Copyright 2011-2016 Howard Chu, Symas Corp. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted only as authorized by the OpenLDAP @@ -392,7 +397,9 @@ typedef enum MDB_cursor_op { MDB_PREV_NODUP, /**< Position at last data item of previous key */ MDB_SET, /**< Position at specified key */ MDB_SET_KEY, /**< Position at specified key, return key + data */ - MDB_SET_RANGE /**< Position at first key greater than or equal to specified key. */ + MDB_SET_RANGE, /**< Position at first key greater than or equal to specified key. */ + MDB_PREV_MULTIPLE /**< Position at previous page and return key and up to + a page of duplicate data items. Only for #MDB_DUPFIXED */ } MDB_cursor_op; /** @defgroup errors Return Codes @@ -538,9 +545,11 @@ int mdb_env_create(MDB_env **env); * allowed. LMDB will still modify the lock file - except on read-only * filesystems, where LMDB does not use locks. * <li>#MDB_WRITEMAP - * Use a writeable memory map unless MDB_RDONLY is set. This is faster - * and uses fewer mallocs, but loses protection from application bugs + * Use a writeable memory map unless MDB_RDONLY is set. This uses + * fewer mallocs but loses protection from application bugs * like wild pointer writes and other bad updates into the database. + * This may be slightly faster for DBs that fit entirely in RAM, but + * is slower for DBs larger than RAM. * Incompatible with nested transactions. * Do not mix processes with and without MDB_WRITEMAP on the same * environment. This can defeat durability (#mdb_env_sync etc). @@ -1535,7 +1544,7 @@ int mdb_cursor_del(MDB_cursor *cursor, unsigned int flags); * <li>EINVAL - cursor is not initialized, or an invalid parameter was specified. * </ul> */ -int mdb_cursor_count(MDB_cursor *cursor, size_t *countp); +int mdb_cursor_count(MDB_cursor *cursor, mdb_size_t *countp); /** @brief Compare two data items according to a particular database. * |