[#BloombergLP-bslmt-TimedSemaphoreImpl-09]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslmt.adoc[bslmt]::TimedSemaphoreImpl
:relfileprefix: ../../
:mrdocs:

Forward declaration of platform‐specific timed semaphore implementation.

== Synopsis

Declared in `<bslmt_timedsemaphoreimpl_pthread.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class TIMED_SEMAPHORE_POLICY>
class TimedSemaphoreImpl;
----

== Specializations

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslmt/TimedSemaphoreImpl-041.adoc[`TimedSemaphoreImpl<Platform::PosixAdvTimedSemaphore>`] 
| This class implements a timed semaphore in terms of POSIX operations. Note that only certain platforms provide `sem_timedwait`; on those that do not, `TimedSemaphoreImpl<PthreadTimedSemaphore>` is used.
| xref:BloombergLP/bslmt/TimedSemaphoreImpl-04b.adoc[`TimedSemaphoreImpl<Platform::PthreadTimedSemaphore>`] 
| This class implements a portable semaphore type for thread synchronization.
|===



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