[#BloombergLP-bslmt-QLock_EventFlag-waitUntilSet]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslmt.adoc[bslmt]::xref:BloombergLP/bslmt/QLock_EventFlag.adoc[QLock_EventFlag]::waitUntilSet
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Wait until this flag has been set (returning immediately if this flag is already set), and, if this flag is not already set, spin for the specified `spinCount` iterations before waiting on a semaphore. The behavior is undefined unless there are no other threads waiting for this flag to be set.

== Synopsis

Declared in `<bslmt_qlock.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
waitUntilSet(int spinRetryCount);
----


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