(PECL eio >= 0.0.1dev) Returns number of threads currently in use

(PECL eio >= 0.0.1dev) Change file last access and modification times.

(PECL ev >= 0.2.0) Suspend the loop public

(PECL sync >= 1.0.0) Waits for a read lock

(PECL pthreads >= 2.0.0) Manipulation public

(PECL ev >= 0.2.0) Returns the set of backends supported by current libev configuration.

(PHP 5 >= 5.3.0, PHP 7) Check whether a message queue exists

(PHP 4 >= 4.0.4, PHP 5, PHP 7) Get size of shared memory block

(PECL ev >= 0.2.0) Returns the set of backends that are embeddable in other event loops.

(PHP 4, PHP 5, PHP 7) Release a semaphore bool