[#BloombergLP-bslmt-FastPostSemaphoreImpl-tryWait]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslmt.adoc[bslmt]::xref:BloombergLP/bslmt/FastPostSemaphoreImpl.adoc[FastPostSemaphoreImpl]::tryWait
:relfileprefix: ../../../
:mrdocs:

Attempt to acquire a resource without blocking.

== Synopsis

Declared in `<bslmt_fastpostsemaphoreimpl.h>`

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

== Description

If this semaphore is initially disabled, return `e_DISABLED` with no effect on the count. Otherwise, if the count of this semaphore is a positive value, return 0 and atomically decrement the count. If this semaphore is not disabled and the count of this semaphore is not a positive value, return `e_WOULD_BLOCK` with no effect on the count.

== Return Value

0 on success, `e_DISABLED` if disabled, or `e_WOULD_BLOCK` if the count is not positive


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