[#BloombergLP-bslmt-Barrier-2constructor-0a]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslmt.adoc[bslmt]::xref:BloombergLP/bslmt/Barrier.adoc[Barrier]::Barrier
:relfileprefix: ../../../
:mrdocs:

Create a barrier that requires the specified `numArrivals` to unblock. Use the monotonic system clock as the clock against which the `absTime` timeouts passed to the `timedWait` methods are interpreted (see {Supported Clock‐Types} in the component‐level documentation). The behavior is undefined unless `0 < numArrivals`.

== Synopsis

Declared in `<bslmt_barrier.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
Barrier(
    int numArrivals,
    std::chrono::steady_clock const&);
----


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