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<?php |
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/** |
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* GpsLab component. |
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* |
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* @author Peter Gribanov <[email protected]> |
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* @copyright Copyright (c) 2011, Peter Gribanov |
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* @license http://opensource.org/licenses/MIT |
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*/ |
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namespace GpsLab\Component\Shmop; |
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class Block |
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{ |
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/** |
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* Default permission (octal) that will be used in created memory blocks. |
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* |
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* @var int |
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*/ |
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const DEFAULT_PERMISSION = 0644; |
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/** |
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* Shared memory block id returned by shmop_open. |
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* |
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* @var int |
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*/ |
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protected $shmid; |
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/** |
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* Shared memory block instantiation. |
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* |
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* In the constructor we'll check if the block we're going to manipulate |
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* already exists or needs to be created. If it exists, let's open it. |
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* |
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* @param string $id |
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* @param int $size |
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* @param int $perms |
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*/ |
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public function __construct($id, $size, $perms = self::DEFAULT_PERMISSION) |
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{ |
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if ($this->exists($id)) { |
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$this->shmid = shmop_open($id, 'w', $perms, $size); |
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} else { |
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$this->shmid = shmop_open($id, 'c', $perms, $size); |
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} |
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} |
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/** |
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* Checks if a shared memory block with the provided id exists or not. |
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* |
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* @param string $id |
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* |
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* @return bool |
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*/ |
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public function exists($id) |
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{ |
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return (bool) @shmop_open($id, 'a', 0, 0); |
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} |
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/** |
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* Writes on a shared memory block. |
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* |
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* @param string $data |
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* |
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* @return bool |
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*/ |
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public function write($data) |
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{ |
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return false !== shmop_write($this->shmid, $data, 0); |
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} |
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/** |
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* Reads from a shared memory block. |
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* |
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* @return string |
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*/ |
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public function read() |
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{ |
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return trim(shmop_read($this->shmid, 0, shmop_size($this->shmid))); |
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} |
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/** |
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* Mark a shared memory block for deletion. |
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* |
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* @return bool |
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*/ |
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public function delete() |
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{ |
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/* |
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* Bug fix |
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* @link https://bugs.php.net/bug.php?id=71921 |
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*/ |
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1 |
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shmop_write($this->shmid, str_pad('', shmop_size($this->shmid), ' '), 0); |
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return shmop_delete($this->shmid); |
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} |
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/** |
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* Closes the shared memory block and stops manipulation. |
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*/ |
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public function __destruct() |
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{ |
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shmop_close($this->shmid); |
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} |
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} |
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gpslab /
shmop
