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mdbx: рефакторинг читающих транзакций в вычленением txn_ro_start(), txn_ro_seize(), txn_ro_slot().

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This commit is contained in:
Леонид Юрьев (Leonid Yuriev)
2025-01-14 14:33:20 +03:00
parent 0accf98ff7
commit 7e772114bc
6 changed files with 230 additions and 190 deletions
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12
src/mvcc-readers.c
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@@ -50,23 +50,23 @@ bsr_t mvcc_bind_slot(MDBX_env *env) {
}
}
result.rslot = &env->lck->rdt[slot];
result.slot = &env->lck->rdt[slot];
/* Claim the reader slot, carefully since other code
* uses the reader table un-mutexed: First reset the
* slot, next publish it in lck->rdt_length. After
* that, it is safe for mdbx_env_close() to touch it.
* When it will be closed, we can finally claim it. */
atomic_store32(&result.rslot->pid, 0, mo_AcquireRelease);
safe64_reset(&result.rslot->txnid, true);
atomic_store32(&result.slot->pid, 0, mo_AcquireRelease);
safe64_reset(&result.slot->txnid, true);
if (slot == nreaders)
env->lck->rdt_length.weak = (uint32_t)++nreaders;
result.rslot->tid.weak = (env->flags & MDBX_NOSTICKYTHREADS) ? 0 : osal_thread_self();
atomic_store32(&result.rslot->pid, env->pid, mo_AcquireRelease);
result.slot->tid.weak = (env->flags & MDBX_NOSTICKYTHREADS) ? 0 : osal_thread_self();
atomic_store32(&result.slot->pid, env->pid, mo_AcquireRelease);
lck_rdt_unlock(env);
if (likely(env->flags & ENV_TXKEY)) {
eASSERT(env, env->registered_reader_pid == env->pid);
thread_rthc_set(env->me_txkey, result.rslot);
thread_rthc_set(env->me_txkey, result.slot);
}
return result;
}