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mdbx: add MDBX_opt_dp_reserve_limit.

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

Change-Id: I620b6dcd833fcff19680770974f32431ab91c0ab
This commit is contained in:
Leonid Yuriev 2020-11-21 17:22:28 +03:00
parent 42019e0b8d
commit 461ba000e3
2 changed files with 35 additions and 0 deletions
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3
mdbx.h
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@ -1799,6 +1799,9 @@ enum MDBX_option_t {
MDBX_opt_sync_period,
MDBX_opt_max_dbx,
MDBX_opt_max_readers,
/** \brief The limit to grow a list of pre-allocated dirty pages. */
MDBX_opt_dp_reserve_limit,
};
#ifndef __cplusplus
/** \ingroup c_settings */

32
src/core.c
View File

@ -19637,6 +19637,9 @@ __cold int mdbx_env_set_option(MDBX_env *env, const MDBX_option_t option,
if (unlikely(err != MDBX_SUCCESS))
return err;
const bool lock_needed = (env->me_map && env->me_txn0 &&
env->me_txn0->mt_owner != mdbx_thread_self());
bool should_unlock = false;
switch (option) {
case MDBX_opt_sync_bytes:
if (unlikely(env->me_flags & MDBX_RDONLY))
@ -19684,10 +19687,35 @@ __cold int mdbx_env_set_option(MDBX_env *env, const MDBX_option_t option,
env->me_maxreaders = (unsigned)value;
break;
case MDBX_opt_dp_reserve_limit:
if (unlikely(value > INT_MAX))
return MDBX_EINVAL;
if (env->me_options.dp_reserve_limit != (unsigned)value) {
if (lock_needed) {
err = mdbx_txn_lock(env, false);
if (unlikely(err != MDBX_SUCCESS))
return err;
should_unlock = true;
}
env->me_options.dp_reserve_limit = (unsigned)value;
while (env->me_dp_reserve_len > env->me_options.dp_reserve_limit) {
mdbx_assert(env, env->me_dp_reserve != NULL);
MDBX_page *mp = env->me_dp_reserve;
ASAN_UNPOISON_MEMORY_REGION(&mp->mp_next, sizeof(mp->mp_next));
VALGRIND_MAKE_MEM_DEFINED(&mp->mp_next, sizeof(mp->mp_next));
env->me_dp_reserve = mp->mp_next;
mdbx_free(mp);
env->me_dp_reserve_len -= 1;
}
}
break;
default:
return MDBX_EINVAL;
}
if (should_unlock)
mdbx_txn_unlock(env);
return err;
}
@ -19720,6 +19748,10 @@ __cold int mdbx_env_get_option(const MDBX_env *env, const MDBX_option_t option,
*value = env->me_maxreaders;
break;
case MDBX_opt_dp_reserve_limit:
*value = env->me_options.dp_reserve_limit;
break;
default:
return MDBX_EINVAL;
}