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A case analysis of pipeline communication in PHP multithreaded programming

This article mainly introduces the pipeline communication of the multi-threaded programming of PHP, the example analyzes the principle of the pipeline communication and related use skills, has a certain reference value, the need for friends can refer to the next

In this paper, we describe the usage of pipeline communication in PHP multithreaded programming. Share to everyone for your reference. The specific analysis is as follows:

A thread if it is a heroic heroism, then multi-threading is collectivism, you are no longer a loner, but a conductor.

Pipeline communication:
1. Pipelines can be thought of as a queue, and different threads can write things inside, and they can read from the inside. Write is
Added at the end of the queue, read is deleted in the team header.

2. Pipelines generally have size, the default is generally 4K, that is, the content of more than 4 K, you can only read, can not be written inside.

3. By default, after a pipeline is written, it is blocked until the read of his program reads the data. The read thread is also blocked,
Until a process writes data to the pipeline. Of course, you can change the default property by using the Stream_set_block function, which is set to non-blocking mode.

Here is a pipeline I split the class (this class naming problems, no unity, no time to change to unified, I generally first write the test code, the final sub-assembly, so the name may not be unified):

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Class Pipe { Public $fifoPath; Private $w _pipe; Private $r _pipe; /** * Automatically create a pipeline * * @param string $name pipe name * @param int $mode The permission of the pipe, any user group can read and write by default */ function __construct ($name = ' pipe ', $mode = 0666) { $fifoPath = "/tmp/$name." Posix_getpid (); if (!file_exists ($fifoPath)) { if (!posix_mkfifo ($fifoPath, $mode)) { Error ("Create new pipe ($name) error."); return false; } } else { Error ("Pipe ($name) has exit."); return false; } $this->fifopath = $fifoPath; } /////////////////////////////////////////////////// Write Pipeline function start /////////////////////////////////////////////////// function Open_write () { $this->w_pipe = fopen ($this->fifopath, ' W '); if ($this->w_pipe = = NULL) { Error ("Open pipe {$this->fifopath} for write error."); return false; } return true; } function Write ($data) { Return fwrite ($this->w_pipe, $data); } function Write_all ($data) { $w _pipe = fopen ($this->fifopath, ' W '); Fwrite ($w _pipe, $data); Fclose ($w _pipe); } function Close_write () { Return fclose ($this->w_pipe); } ///////////////////////////////////////////////////////// Read Pipeline correlation function start //////////////////////////////////////////////////////// function Open_read () { $this->r_pipe = fopen ($this->fifopath, ' R '); if ($this->r_pipe = = NULL) { Error ("Open pipe {$this->fifopath} for read error."); return false; } return true; } function Read ($byte = 1024) { Return Fread ($this->r_pipe, $byte); } function Read_all () { $r _pipe = fopen ($this->fifopath, ' R '); $data = "; while (!feof ($r _pipe)) { echo "read one k\n"; $data. = Fread ($r _pipe, 1024); } Fclose ($r _pipe); return $data; } function Close_read () { Return fclose ($this->r_pipe); } /** * Delete Pipeline * * @return Boolean is success */ function Rm_pipe () { Return unlink ($this->fifopath); } } ?> /* With this class, you can implement a simple pipeline communication. */

I hope this article is helpful to everyone's PHP programming.

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