sem_remove
(PHP 4 >= 4.1.0, PHP 5)
sem_remove — Remove a semaphore
Описание
bool sem_remove
( resource
$sem_identifier
)sem_remove() removes the given semaphore.
After removing the semaphore, it is no longer accessible.
Возвращаемые значения
Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.
Смотрите также
- sem_get() - Get a semaphore id
- sem_release() - Release a semaphore
- sem_acquire() - Acquire a semaphore
Коментарии
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.