[#GlobalMutex]
= GlobalMutex
:mrdocs:

Different type to mark Mutex at global scope

== Synopsis

Declared in `<sync.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class GlobalMutex
    : public xref:Mutex.adoc[Mutex]
----

== Description

Thread safety analysis can't handle negative assertions about mutexes with global scope well, so mark them with a separate type, and eventually move all the mutexes into classes so they are not globally visible.

See: https://github.com/bitcoin/bitcoin/pull/20272#issuecomment‐720755781

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:Mutex.adoc[Mutex]`
| Wrapped mutex: supports waiting but not recursive locking
|===


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