[#cs_main]
= cs_main
:mrdocs:

Mutex to guard access to validation specific variables, such as reading or changing the chainstate.

== Synopsis

Declared in `<kernel/cs_main.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
extern
xref:RecursiveMutex.adoc[RecursiveMutex] cs_main;
----

== Description

This may also need to be locked when updating the transaction pool, e.g. on AcceptToMemoryPool. See CTxMemPool::cs comment for details.

The transaction pool has a separate lock to allow reading from it and the chainstate at the same time.


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