eio_grp

Creates a request group.

Description

resource eio_grp ( callable $callback [, string $data = NULL ] )

eio_grp creates a request group.

Parameters

callback

callback function is called when the request is done. It should match the following prototype:

void callback(mixed $data, int $result[, resource $req]);
data

is custom data passed to the request.

result

request-specific result value; basically, the value returned by corresponding system call.

req

is optional request resource which can be used with functions like eio_get_last_error

data

Arbitrary variable passed to callback.

Return Values

eio_grp returns request group resource on success or FALSE on error.

Examples

Example #1 eio_grp example

<?php
$temp_filename 
dirname(__FILE__) ."/eio-file.tmp";
$fp fopen($temp_filename"w");
fwrite($fp"some data");
fclose($fp);
$my_file_fd NULL;

/* Is called when the group requests are done */
function my_grp_done($data$result) {
 
// Remove the file, if it still exists
 
@unlink($data);
}

/* Is called when the temporary file is opened */
function my_grp_file_opened_callback($data$result) {
 global 
$my_file_fd$grp;

 
$my_file_fd $result;

 
$req eio_read($my_file_fd40,
   
EIO_PRI_DEFAULT"my_grp_file_read_callback");
 
eio_grp_add($grp$req);
}

/* Is called when the file is read */
function my_grp_file_read_callback($data$result) {
 global 
$my_file_fd$grp;

 
var_dump($result);

 
// Create request to close the file
 
$req eio_close($my_file_fd);

 
// Add request to the group
 
eio_grp_add($grp$req);
}

// Create request group
$grp eio_grp("my_grp_done"$temp_filename);

// Create request
$req eio_open($temp_filenameEIO_O_RDWR EIO_O_APPEND NULL,
  
EIO_PRI_DEFAULT"my_grp_file_opened_callback"NULL);

// Add request to the group
eio_grp_add($grp$req);

// Process requests
eio_event_loop();
?>

The above example will output something similar to:

string(4) "some"

See Also

  • eio_grp_cancel
  • eio_grp_add