std::experimental::latch::count_down

 

C++

Language

Standard Library Headers

Freestanding and hosted implementations

Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

Utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Filesystem library (C++17)

Technical Specifications

 

Technical specifications

Filesystem library (filesystem TS)

Library fundamentals (library fundamentals TS)

Library fundamentals 2 (library fundamentals 2 TS)

Extensions for parallelism (parallelism TS)

Extensions for parallelism 2 (parallelism TS v2)

Extensions for concurrency (concurrency TS)

Concepts (concepts TS)

Ranges (ranges TS)

Special mathematical functions (special math TR)

 

Extensions for concurrency

std::future extensions

experimental::future

experimental::shared_future

experimental::when_all

experimental::when_any

experimental::make_ready_future

experimental::make_exceptional_future

Latches and barriers

experimental::latch

experimental::barrier

experimental::flex_barrier

Atomic smart pointers

experimental::atomic_shared_ptr

experimental::atomic_weak_ptr

 

std::experimental::latch

latch::latch

latch::~latch

latch::count_down_and_wait

latch::count_down

latch::is_ready

latch::wait

 

void count_down( ptrdiff_t n = 1);	(1)	(concurrency TS)

Atomically decrements the internal counter by n without blocking the caller.

If n is greater than the value of the internal counter or is negative, the behavior is undefined.

This operation synchronizes with all calls that block on this latch and all is_ready calls on this latch that returns true.

Parameters

n

-

the value by which the internal counter is decreased

Return value

(none)

Exceptions

Throws nothing.