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mdbx: rework env_sync() for MDBX_NOMETASYNC, add mdbx_env_sync_poll().

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Change-Id: I4d212c663853b00e221d17cb8483353231497b48
This commit is contained in:
Leonid Yuriev
2019-09-29 23:51:43 +03:00
parent 91ee841fc2
commit 83da954725
3 changed files with 90 additions and 29 deletions
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21
mdbx.h
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@@ -1614,8 +1614,11 @@ LIBMDBX_API int mdbx_env_info(MDBX_env *env, MDBX_envinfo *info, size_t bytes);
* provide polling mode for lazy/asynchronous sync in conjunction with
* mdbx_env_set_syncbytes() and/or mdbx_env_set_syncperiod().
*
* Legacy mdbx_env_sync() correspond to calling mdbx_env_sync_ex() with the
* argument nonblock=false.
* The mdbx_env_sync() is shortcut to calling mdbx_env_sync_ex() with
* try force=true and nonblock=false arguments.
*
* The mdbx_env_sync_poll() is shortcut to calling mdbx_env_sync_ex() with
* the force=false and nonblock=true arguments.
*
* NOTE: This call is not valid if the environment was opened with MDBX_RDONLY.
*
@@ -1628,13 +1631,15 @@ LIBMDBX_API int mdbx_env_info(MDBX_env *env, MDBX_envinfo *info, size_t bytes);
* [in] nonblock Don't wait if write transaction is running by other thread.
*
* Returns A non-zero error value on failure and MDBX_RESULT_TRUE or 0 on
* success. The MDBX_RESULT_TRUE means some data was flushed to disk,
* success. The MDBX_RESULT_TRUE means no data pending for flush to disk,
* and 0 otherwise. Some possible errors are:
* - MDBX_EACCES = the environment is read-only.
* - MDBX_BUSY = the environment is used by other thread and nonblock=true.
* - MDBX_EINVAL = an invalid parameter was specified.
* - MDBX_EIO = an error occurred during synchronization. */
LIBMDBX_API int mdbx_env_sync_ex(MDBX_env *env, int force, int nonblock);
LIBMDBX_API int mdbx_env_sync(MDBX_env *env, int force);
LIBMDBX_API int mdbx_env_sync(MDBX_env *env);
LIBMDBX_API int mdbx_env_sync_poll(MDBX_env *env);
/* Sets threshold to force flush the data buffers to disk,
* even of MDBX_NOSYNC, MDBX_NOMETASYNC and MDBX_MAPASYNC flags
@@ -1649,12 +1654,12 @@ LIBMDBX_API int mdbx_env_sync(MDBX_env *env, int force);
* The default is 0, than mean no any threshold checked, and no additional
* flush will be made.
*
* [in] env An environment handle returned by mdbx_env_create()
* [in] bytes The size in bytes of summary changes when a synchronous
* flush would be made.
* [in] env An environment handle returned by mdbx_env_create().
* [in] threshold The size in bytes of summary changes when a synchronous
* flush would be made.
*
* Returns A non-zero error value on failure and 0 on success. */
LIBMDBX_API int mdbx_env_set_syncbytes(MDBX_env *env, size_t bytes);
LIBMDBX_API int mdbx_env_set_syncbytes(MDBX_env *env, size_t threshold);
/* Sets relative period since the last unsteay commit to force flush the data
* buffers to disk, even of MDBX_NOSYNC, MDBX_NOMETASYNC and MDBX_MAPASYNC flags