(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)
sem_remove — Удаляет семафор
Функция sem_remove() удаляет семафор.
После удаления семафора он становится недоступным.
semaphore
Функция возвращает true , если выполнилась успешно, или false , если возникла ошибка.
| Версия | Описание |
|---|---|
| 8.0.0 |
Параметр semaphore теперь ожидает экземпляр класса SysvSemaphore ;
раньше ожидался ресурс (resource ).
|
sem_remove() shouldn't be part of a normal cleanup/teardown and should be called very rarely due to bugs in the implementation.
It doesn't seem to hurt to leave semaphores lying around and is likely to be more performance-friendly to do so. If you are concerned about having too many semaphores floating around for an application (e.g. a file cache that uses ftok()), you can use some modulus arithmetic and simple addition to create a limited range of values for your semaphores off in the middle of nowhere. For example, ftok() % 101 + 0xBADBEEF. Be sure to replace 0xBADBEEF with your own random value. The example limits the range to 101 semaphores. 101 is a prime number - so if you want more or less, be sure to replace it with a prime number since primes theoretically help distribute values more evenly.