From e6918187568dbd01842d8d1d2c808ce16a894239 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 21 Apr 2024 13:54:28 +0200 Subject: Adding upstream version 18.2.2. Signed-off-by: Daniel Baumann --- src/rocksdb/db/pre_release_callback.h | 37 +++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 src/rocksdb/db/pre_release_callback.h (limited to 'src/rocksdb/db/pre_release_callback.h') diff --git a/src/rocksdb/db/pre_release_callback.h b/src/rocksdb/db/pre_release_callback.h new file mode 100644 index 000000000..6b9039487 --- /dev/null +++ b/src/rocksdb/db/pre_release_callback.h @@ -0,0 +1,37 @@ +// Copyright (c) 2011-present, Facebook, Inc. All rights reserved. +// This source code is licensed under both the GPLv2 (found in the +// COPYING file in the root directory) and Apache 2.0 License +// (found in the LICENSE.Apache file in the root directory). + +#pragma once + +#include "rocksdb/status.h" +#include "rocksdb/types.h" + +namespace ROCKSDB_NAMESPACE { + +class PreReleaseCallback { + public: + virtual ~PreReleaseCallback() {} + + // Will be called while on the write thread after the write to the WAL and + // before the write to memtable. This is useful if any operation needs to be + // done before the write gets visible to the readers, or if we want to reduce + // the overhead of locking by updating something sequentially while we are on + // the write thread. If the callback fails, this function returns a non-OK + // status, the sequence number will not be released, and same status will be + // propagated to all the writers in the write group. + // seq is the sequence number that is used for this write and will be + // released. + // is_mem_disabled is currently used for debugging purposes to assert that + // the callback is done from the right write queue. + // If non-zero, log_number indicates the WAL log to which we wrote. + // index >= 0 specifies the order of callback in the same write thread. + // total > index specifies the total number of callbacks in the same write + // thread. Together with index, could be used to reduce the redundant + // operations among the callbacks. + virtual Status Callback(SequenceNumber seq, bool is_mem_disabled, + uint64_t log_number, size_t index, size_t total) = 0; +}; + +} // namespace ROCKSDB_NAMESPACE -- cgit v1.2.3