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mdbx: add MDBX_ACCEDE environment opening flag.

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Change-Id: If0a08d6fce127f35ff2992988715b7dc1fdb70a9
This commit is contained in:
Leonid Yuriev
2019-11-14 20:45:39 +03:00
parent cb8fac6f5f
commit 42d9e06598
5 changed files with 79 additions and 36 deletions
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16
mdbx.h
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@@ -921,6 +921,22 @@ LIBMDBX_API const char *mdbx_dump_val(const MDBX_val *key, char *const buf,
* This flag affects only at environment opening but can't be changed after. */
#define MDBX_EXCLUSIVE 0x400000u
/* MDBX_ACCEDE = using database which already opened by another process(es).
*
* The MDBX_ACCEDE flag avoid MDBX_INCOMPATIBLE error while opening If the
* database is already used by another process(es) and environment mode/flags
* isn't compatible. In such cases, when using the MDBX_ACCEDE flag, instead of
* the specified incompatible options, the mode in which the database is already
* opened by other processes will be used, including MDBX_LIFORECLAIM,
* MDBX_COALESCE and MDBX_NORDAHEAD. The MDBX_ACCEDE flag is useful to open a
* database that already used by another process(es) and used mode/flags isn't
* known.
*
* MDBX_ACCEDE has no effect if the current process is the only one either
* opening the DB in read-only mode or other process(es) uses the DB in
* read-only mode. */
#define MDBX_ACCEDE 0x40000000u
/* MDBX_WRITEMAP = map data into memory with write permission.
*
* Use a writeable memory map unless MDBX_RDONLY is set. This uses fewer mallocs