(PECL ev >= 0.2.0) Constructs EvPeriodic watcher object

(PECL libevent >= 0.0.5) Assign a priority to an event.

(PHP 4, PHP 5, PHP 7) Send a signal to a process

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Execute a command and open file pointers for input/output

(PECL eio >= 0.0.1dev) Truncate a file resource

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Returns the signal which caused the child to terminate

(PECL ev >= 0.2.0) Returns the absolute time that this watcher is supposed to trigger next

(PECL pthreads >= 2.0.0) Creates a new Pool of Workers