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mdbx: дополнение API функциями lock/unlock/upgrade/downgrade основной блокировки.

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This commit is contained in:
Леонид Юрьев (Leonid Yuriev)
2023-10-10 23:14:40 +03:00
parent dd9fc963d2
commit f0d523c507
6 changed files with 126 additions and 63 deletions
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14
src/osal.h
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@@ -718,6 +718,8 @@ MDBX_INTERNAL_FUNC int osal_lck_seize(MDBX_env *env);
/// operational lock.
/// \return Error code or zero on success
MDBX_INTERNAL_FUNC int osal_lck_downgrade(MDBX_env *env);
MDBX_MAYBE_UNUSED MDBX_INTERNAL_FUNC int osal_lck_upgrade(MDBX_env *env,
bool dont_wait);
/// \brief Locks LCK-file or/and table of readers for (de)registering.
/// \return Error code or zero on success
@@ -726,16 +728,12 @@ MDBX_INTERNAL_FUNC int osal_rdt_lock(MDBX_env *env);
/// \brief Unlocks LCK-file or/and table of readers after (de)registering.
MDBX_INTERNAL_FUNC void osal_rdt_unlock(MDBX_env *env);
/// \brief Acquires lock for DB change (on writing transaction start)
/// Reading transactions will not be blocked.
/// Declared as LIBMDBX_API because it is used in mdbx_chk.
/// \brief Acquires write-transaction lock.
/// \return Error code or zero on success
LIBMDBX_API int mdbx_txn_lock(MDBX_env *env, bool dont_wait);
MDBX_INTERNAL_FUNC int osal_txn_lock(MDBX_env *env, bool dont_wait);
/// \brief Releases lock once DB changes is made (after writing transaction
/// has finished).
/// Declared as LIBMDBX_API because it is used in mdbx_chk.
LIBMDBX_API void mdbx_txn_unlock(MDBX_env *env);
/// \brief Releases write-transaction lock..
MDBX_INTERNAL_FUNC void osal_txn_unlock(MDBX_env *env);
/// \brief Sets alive-flag of reader presence (indicative lock) for PID of
/// the current process. The function does no more than needed for