# std::counting_semaphore<LeastMaxValue>::release

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< cpp‎ | thread‎ | counting semaphore

void release( std::ptrdiff_t update = 1 ); |  | (since C++20)

Atomically increments the internal counter by the value of `update`. Any thread(s) waiting for the counter to be greater than ​0​, such as due to being blocked in acquire, will subsequently be unblocked.

### Preconditions

Both update >= 0 and update <= max() - counter are true, where `counter` is the value of the internal counter.

### Parameters

update | - | the amount to increment the internal counter by

### Exceptions

May throw std::system_error.

### See also

acquire | decrements the internal counter or blocks until it can (public member function)
try_acquire | tries to decrement the internal counter without blocking (public member function)
try_acquire_for | tries to decrement the internal counter, blocking for up to a duration time (public member function)
try_acquire_until | tries to decrement the internal counter, blocking until a point in time (public member function)

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