[#std-shared_lock-0b-2constructor-00e]
= xref:std.adoc[std]::xref:std/shared_lock-0b.adoc[shared_lock<folly::SharedMutexImpl<ReaderPriority, Tag_, Atom, Policy>>]::shared_lock
:relfileprefix: ../../
:mrdocs:

Constructs a lock and tries to acquire the mutex within a duration.

== Synopsis

Declared in `<folly/SharedMutex.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename Rep,
    typename Period>
[[nodiscard]]
shared_lock(
    xref:std/shared_lock-0b/mutex_type.adoc[mutex_type]& mutex,
    std::chrono::duration<Rep, Period> const& timeout);
----

== Return Value

[NOTE]
====
The return value https://en.cppreference.com/cpp/language/attributes/nodiscard[should not be discarded^].
====
== Parameters

[cols="1,4"]
|===
| Name| Description
| *mutex*
| Mutex to try to lock.
| *timeout*
| Maximum time to wait for the lock.
|===


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