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

Tries to acquire the managed mutex in shared mode within a duration.

== Synopsis

Declared in `<folly/SharedMutex.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename Rep,
    typename Period>
bool
try_lock_for(std::chrono::duration<Rep, Period> const& timeout);
----

== Return Value

`true` if the lock was acquired before the duration elapsed.

== Parameters

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


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