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.

Synopsis

Declared in <bslmt_timedsemaphoreimpl_posixadv.h>

template<>
class TimedSemaphoreImpl<Platform::PosixAdvTimedSemaphore>;

Enums

Name

Description

Unnamed enum

The value timedWait returns when a timeout occurs.

Member Functions

Name

Description

TimedSemaphoreImpl [constructor]

Constructors

~TimedSemaphoreImpl [destructor]

Destroy this semaphore object.

clockType

Return the clock type used for timeouts.

post

post overloads

timedWait

Block until the count of this semaphore is a positive value, or until the specified absTime timeout expires. absTime is an absolute time represented as an interval from some epoch, which is determined by the clock indicated at construction (see {Supported Clock‐Types} in the component documentation). If the absTime timeout did not expire before the count attained a positive value, atomically decrement the count and return 0; otherwise, return a non‐zero value with no effect on the count.

tryWait

Decrement the count of this semaphore if it is positive and return 0. Return a non‐zero value otherwise.

wait

Block until the count is a positive value and atomically decrement it.

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