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mdbx: rework auto-sync by volume feature.

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Change-Id: I0a34a65a974f28c6f0a950c11d55a43cfcfcab22
This commit is contained in:
Leonid Yuriev
2019-08-23 11:40:30 +03:00
parent 6f8238e1e9
commit 68e0076ca3
3 changed files with 79 additions and 54 deletions
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7
mdbx.h
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@@ -1581,14 +1581,15 @@ LIBMDBX_API char *mdbx_dkey(const MDBX_val *key, char *const buf,
LIBMDBX_API int mdbx_env_close_ex(MDBX_env *env, int dont_sync);
/* Set threshold to force flush the data buffers to disk,
/* Sets threshold to force flush the data buffers to disk,
* even of MDBX_NOSYNC, MDBX_NOMETASYNC and MDBX_MAPASYNC flags
* in the environment.
* in the environment. The value affects all processes which operates with given
* DB until the last process close DB or a new value will be settled.
*
* Data is always written to disk when mdbx_txn_commit() is called,
* but the operating system may keep it buffered. MDBX always flushes
* the OS buffers upon commit as well, unless the environment was
* opened with MDBX_NOSYNC or in part MDBX_NOMETASYNC.
* opened with MDBX_NOSYNC, MDBX_MAPASYNC or in part MDBX_NOMETASYNC.
*
* The default is 0, than mean no any threshold checked, and no additional
* flush will be made.