(PECL pthreads >= 2.0.0)
A Pool is a container for, and controller of, an adjustable number of Workers.
Pooling provides a higher level abstraction of the Worker functionality, including the management of references in the way required by pthreads.
$size) : void
maximum number of Workers this Pool can use
the class of the Worker
references to Workers
the arguments for constructor of new Workers
offset in workers of the last Worker used