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File: docs/book/kernel-process.md

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File: docs/book/kernel-process.md
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Class: ZEUS for PHP
Manage the execution of multiple parallel tasks
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Introduction

In ZEUS, Process is defined as an instance of a PHP application that is being executed.

The execution of a single process must progress in a sequential fashion, therefore to achieve true concurrency, ZEUS may use _Process Scheduler_ to instantiate more than one such process at the same time.

Process states

When a process executes, it passes through different states. In ZEUS, a process can have one of the following five states at a time:

Process life-cycle figure

Process can use hardware resources in only two states: waiting and running.

The following table describes each state in details:

| State | Description | |--------------|---------------------------------------------------------------------------------------------------------------------------------------------| | STARTED | An initial state when a process is first created | | WAITING | Process is in a waiting state if it needs to wait for a resource, such as waiting for network connection, or some data to become available | | RUNNING | Process sets the state to running just before it starts processing its data | | TERMINATED | When process is terminated by the Process Scheduler, it is moved to the terminated state where it waits to be removed from the Task Pool | | EXITED | This state is set when process finishes its execution, and it waits to be removed from the Task Pool |


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