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libmdbx/src/bits.md
Leonid Yuriev d7c06b1337 mdbx: partial fix for recursive SRW-lock with MDBX_NOTLS on Windows. 
Here are some changes to avoid recursive acquisition of SRW-lock,
which is still in use:
 - Read transactions don't acquire the shared SRW-lock with `MDBX_NOTLS.
 - Memory-mapping of DB is always kept while DB opened,
   therefore following limitations are:
 - DB file can't be shrinked while it used,
   including auto-shrink due to auto-compactification with corresponding geometry settings.
 - The upper limit of DB size can't be changed while DB is used.
 - The DB can grow within the upper size limit defined while opening by a first process,
   but this does not work under Wine since there is no `NtExtendSection()` function.

Partially fix https://github.com/erthink/libmdbx/issues/203
2021-06-10 13:42:30 +03:00

3.6 KiB
Raw Blame History

N MASK ENV TXN DB PUT DBI NODE PAGE MRESIZE
0 0000 0001 ALLOC_CACHE TXN_FINISHED DBI_DIRTY F_BIGDATA P_BRANCH
1 0000 0002 ALLOC_GC TXN_ERROR REVERSEKEY F_SUBDATA DBI_STALE F_SUBDATA P_LEAF
2 0000 0004 ALLOC_NEW TXN_DIRTY DUPSORT DBI_FRESH F_DUPDATA P_OVERFLOW
3 0000 0008 ALLOC_SLOT TXN_SPILLS INTEGERKEY DBI_CREAT P_META
4 0000 0010 TXN_HAS_CHILD DUPFIXED NOOVERWRITE DBI_VALID P_BAD
5 0000 0020 INTEGERDUP NODUPDATA DBI_USRVALID P_LEAF2
6 0000 0040 REVERSEDUP CURRENT DBI_DUPDATA P_SUBP
7 0000 0080 ALLDUPS DBI_AUDITED
8 0000 0100 _MAY_MOVE <=
9 0000 0200 _MAY_UNMAP <=
10 0000 0400
11 0000 0800
12 0000 1000
13 0000 2000 P_SPILLED
14 0000 4000 NOSUBDIR P_LOOSE
15 0000 8000 DB_VALID NOSPILL P_FROZEN
16 0001 0000 SAFE_NOSYNC TXN_NOSYNC RESERVE RESERVE
17 0002 0000 RDONLY TXN_RDONLY APPEND APPEND <=
18 0004 0000 NOMETASYNC TXN_NOMETASYNC CREATE APPENDDUP
19 0008 0000 WRITEMAP <= MULTIPLE <=
20 0010 0000 UTTERLY <=
21 0020 0000 NOTLS <=
22 0040 0000 EXCLUSIVE
23 0080 0000 NORDAHEAD
24 0100 0000 NOMEMINIT TXN_PREPARE
25 0200 0000 COALESCE
26 0400 0000 LIFORECLAIM
27 0800 0000 PAGEPERTURB
28 1000 0000 ENV_TXKEY TXN_TRY
29 2000 0000 ENV_ACTIVE
30 4000 0000 ACCEDE SHRINK_ALLOWED DB_ACCEDE
31 8000 0000 FATAL_ERROR