[#kernel-BlockTreeDB-WriteBatchSync]
= xref:kernel.adoc[kernel]::xref:kernel/BlockTreeDB.adoc[BlockTreeDB]::WriteBatchSync
:relfileprefix: ../../
:mrdocs:

Atomically write block‐file info, the last‐file marker, and block‐index entries.

== Synopsis

Declared in `<node/blockstorage.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
WriteBatchSync(
    std::vector<std::pair<int, CBlockFileInfo const*>> const& fileInfo,
    int nLastFile,
    std::vector<CBlockIndex const*> const& blockinfo);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *fileInfo*
| Block‐file info entries to write, each paired with its file number.
| *nLastFile*
| Index of the last block file in use.
| *blockinfo*
| Block‐index entries to write.
|===


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