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Introduction
This extension provides asyncronous POSIX I/O by means of » libeio C library written by Marc Lehmann.
Note: This extension is not available on Windows platforms.
It is important to be aware that each request is executed in a thread, and the order of execution of continuously queued requests basically is unpredictable. For instance, the following piece of code is incorrect.
Example #1 Incorrect requests
<?php
// Request to create symlink of $filename to $link
eio_symlink($filename, $link);
// Request to move $filename to $new_filename
eio_rename($filename, $new_filename);
// Process requests
eio_event_loop();
?>
Example #2 Calling request from a request callback
<?php
function my_symlink_done($filename, $result) {
// Request to move $filename to $new_filename
eio_rename($filename, "/path/to/new-name");
// Process requests
eio_event_loop();
}
// Request to create symlink of $filename to $link
eio_symlink($filename, $link, EIO_PRI_DEFAULT, "my_symlink_done", $filename);
// Process requests
eio_event_loop();
?>
Example #3 Calling request from a request callback
<?php
/* Is called when the group requests are done */
function my_grp_done($data, $result) {
// ...
}
function my_symlink_done($filename, $result) {
// Create eio_rename request and add it to the group
$req = eio_rename($filename, "/path/to/new-name");
eio_grp_add($grp, $req);
// You might want to add more requests...
}
// Create a request group
$grp = eio_grp("my_grp_done", "my_grp_data");
// Create eio_symlink request and add it to the group
// Pass $filename to the callback
$req = eio_symlink($filename, $link,
EIO_PRI_DEFAULT, "my_symlink_done", $filename);
eio_grp_add($grp, $req);
// Process requests
eio_event_loop();
?>
Since version 0.3.0 alpha, a variable used in communications with libeio internally, could be retrieved with eio_get_event_stream(). The variable could be used to bind to an event loop supported by some other extension. You might organize a simple event loop where eio and libevent work together:
Example #4 Using eio with libevent
<?php
function my_eio_poll($fd, $events, $arg) {
/* Some libevent regulation might go here .. */
if (eio_nreqs()) {
eio_poll();
}
/* .. and here */
}
function my_res_cb($d, $r) {
var_dump($r); var_dump($d);
}
$base = event_base_new();
$event = event_new();
// This stream is used to bind with libevent
$fd = eio_get_event_stream();
eio_nop(EIO_PRI_DEFAULT, "my_res_cb", "nop data");
eio_mkdir("/tmp/abc-eio-temp", 0750, EIO_PRI_DEFAULT, "my_res_cb", "mkdir data");
/* some other eio_* calls here ... */
// set event flags
event_set($event, $fd, EV_READ /*| EV_PERSIST*/, "my_eio_poll", array($event, $base));
// set event base
event_base_set($event, $base);
// enable event
event_add($event);
// start event loop
event_base_loop($base);
/* The same will be available via buffered libevent interface */
?>
English translation
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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-intro.eio.html
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References
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The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.
