[#BloombergLP-bslmt-TimedSemaphoreImpl-04b]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslmt.adoc[bslmt]::xref:BloombergLP/bslmt/TimedSemaphoreImpl-09.adoc[TimedSemaphoreImpl]<xref:BloombergLP/bslmt/Platform/PthreadTimedSemaphore.adoc[Platform::PthreadTimedSemaphore]>
:relfileprefix: ../../
:mrdocs:

This class implements a portable semaphore type for thread synchronization.

== Synopsis

Declared in `<bslmt_timedsemaphoreimpl_pthread.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<>
class xref:BloombergLP/bslmt/TimedSemaphoreImpl-09.adoc[TimedSemaphoreImpl]<xref:BloombergLP/bslmt/Platform/PthreadTimedSemaphore.adoc[Platform::PthreadTimedSemaphore]>;
----

== Enums

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslmt/TimedSemaphoreImpl-04b/_04enum.adoc[`Unnamed enum`] 
| The value `timedWait` returns when a timeout occurs.
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslmt/TimedSemaphoreImpl-04b/2constructor-03a.adoc[`TimedSemaphoreImpl`]         [.small]#[constructor]#
| Constructors
| xref:BloombergLP/bslmt/TimedSemaphoreImpl-04b/2destructor.adoc[`~TimedSemaphoreImpl`] [.small]#[destructor]#
| Destroy this semaphore object.
| xref:BloombergLP/bslmt/TimedSemaphoreImpl-04b/clockType.adoc[`clockType`] 
| Return the clock type used for timeouts.
| xref:BloombergLP/bslmt/TimedSemaphoreImpl-04b/post-0b.adoc[`post`] 
| `post` overloads
| xref:BloombergLP/bslmt/TimedSemaphoreImpl-04b/timedWait.adoc[`timedWait`] 
| Block until this semaphore can be acquired or `absTime` expires.
| xref:BloombergLP/bslmt/TimedSemaphoreImpl-04b/tryWait.adoc[`tryWait`] 
| Decrement the count of this semaphore if it is positive and return 0. Return a non‐zero value otherwise.
| xref:BloombergLP/bslmt/TimedSemaphoreImpl-04b/wait.adoc[`wait`] 
| Block until the count is a positive value and atomically decrement it.
|===



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