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mdbx: initial support for set/get_options.

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Initial for https://github.com/erthink/libmdbx/issues/128

Change-Id: I540784c8b54d7443748e3c95f89a7390b818c811
This commit is contained in:
Leonid Yuriev
2020-10-20 14:29:06 +03:00
parent a8ed534cd3
commit 8f60050991
2 changed files with 156 additions and 84 deletions
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60
mdbx.h
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@@ -1793,6 +1793,24 @@ LIBMDBX_API const char *mdbx_strerror_r_ANSI2OEM(int errnum, char *buf,
* \returns a non-zero error value on failure and 0 on success. */
LIBMDBX_API int mdbx_env_create(MDBX_env **penv);
/** \brief MDBX environment options. */
enum MDBX_option_t {
MDBX_opt_sync_bytes,
MDBX_opt_sync_period,
MDBX_opt_max_dbx,
MDBX_opt_max_readers,
};
#ifndef __cplusplus
/** \ingroup c_settings */
typedef enum MDBX_option_t MDBX_option_t;
#endif
LIBMDBX_API int mdbx_env_set_option(MDBX_env *env, const MDBX_option_t option,
const uint64_t value);
LIBMDBX_API int mdbx_env_get_option(const MDBX_env *env,
const MDBX_option_t option,
uint64_t *value);
/** \brief Open an environment instance.
* \ingroup c_opening
*
@@ -2178,7 +2196,10 @@ LIBMDBX_INLINE_API(int, mdbx_env_sync_poll, (MDBX_env * env)) {
* 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 threshold);
LIBMDBX_INLINE_API(int, mdbx_env_set_syncbytes,
(MDBX_env * env, size_t threshold)) {
return mdbx_env_set_option(env, MDBX_opt_sync_bytes, threshold);
}
/** \brief Sets relative period since the last unsteady commit to force flush
* the data buffers to disk, even of \ref MDBX_SAFE_NOSYNC flag in the
@@ -2210,8 +2231,10 @@ LIBMDBX_API int mdbx_env_set_syncbytes(MDBX_env *env, size_t threshold);
* the last unsteady commit.
*
* \returns A non-zero error value on failure and 0 on success. */
LIBMDBX_API int mdbx_env_set_syncperiod(MDBX_env *env,
unsigned seconds_16dot16);
LIBMDBX_INLINE_API(int, mdbx_env_set_syncperiod,
(MDBX_env * env, unsigned seconds_16dot16)) {
return mdbx_env_set_option(env, MDBX_opt_sync_period, seconds_16dot16);
}
/** \brief Close the environment and release the memory map.
* \ingroup c_opening
@@ -2603,7 +2626,10 @@ mdbx_limits_txnsize_max(intptr_t pagesize);
* some possible errors are:
* \retval MDBX_EINVAL An invalid parameter was specified.
* \retval MDBX_EPERM The environment is already open. */
LIBMDBX_API int mdbx_env_set_maxreaders(MDBX_env *env, unsigned readers);
LIBMDBX_INLINE_API(int, mdbx_env_set_maxreaders,
(MDBX_env * env, unsigned readers)) {
return mdbx_env_set_option(env, MDBX_opt_max_readers, readers);
}
/** \brief Get the maximum number of threads/reader slots for the environment.
* \ingroup c_statinfo
@@ -2616,7 +2642,16 @@ LIBMDBX_API int mdbx_env_set_maxreaders(MDBX_env *env, unsigned readers);
* \returns A non-zero error value on failure and 0 on success,
* some possible errors are:
* \retval MDBX_EINVAL An invalid parameter was specified. */
LIBMDBX_API int mdbx_env_get_maxreaders(const MDBX_env *env, unsigned *readers);
LIBMDBX_INLINE_API(int, mdbx_env_get_maxreaders,
(const MDBX_env *env, unsigned *readers)) {
int rc = MDBX_EINVAL;
if (readers) {
uint64_t proxy = 0;
rc = mdbx_env_get_option(env, MDBX_opt_max_readers, &proxy);
*readers = (unsigned)proxy;
}
return rc;
}
/** \brief Set the maximum number of named databases for the environment.
* \ingroup c_settings
@@ -2639,7 +2674,9 @@ LIBMDBX_API int mdbx_env_get_maxreaders(const MDBX_env *env, unsigned *readers);
* some possible errors are:
* \retval MDBX_EINVAL An invalid parameter was specified.
* \retval MDBX_EPERM The environment is already open. */
LIBMDBX_API int mdbx_env_set_maxdbs(MDBX_env *env, MDBX_dbi dbs);
LIBMDBX_INLINE_API(int, mdbx_env_set_maxdbs, (MDBX_env * env, MDBX_dbi dbs)) {
return mdbx_env_set_option(env, MDBX_opt_max_dbx, dbs);
}
/** \brief Get the maximum number of named databases for the environment.
* \ingroup c_statinfo
@@ -2651,7 +2688,16 @@ LIBMDBX_API int mdbx_env_set_maxdbs(MDBX_env *env, MDBX_dbi dbs);
* \returns A non-zero error value on failure and 0 on success,
* some possible errors are:
* \retval MDBX_EINVAL An invalid parameter was specified. */
LIBMDBX_API int mdbx_env_get_maxdbs(MDBX_env *env, MDBX_dbi *dbs);
LIBMDBX_INLINE_API(int, mdbx_env_get_maxdbs,
(const MDBX_env *env, MDBX_dbi *dbs)) {
int rc = MDBX_EINVAL;
if (dbs) {
uint64_t proxy = 0;
rc = mdbx_env_get_option(env, MDBX_opt_max_dbx, &proxy);
*dbs = (MDBX_dbi)proxy;
}
return rc;
}
/** \brief Get the maximum size of keys can write.
* \ingroup c_statinfo