94 lines
1.7 KiB
PHP
94 lines
1.7 KiB
PHP
<?php
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namespace NoccyLabs\Ipc\Shm;
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use NoccyLabs\Ipc\Key\KeyInterface;
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/**
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* Shared memory segment
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*/
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class SharedMemory implements \ArrayAccess
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{
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protected $resource;
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/**
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* Constructor
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*
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* @param KeyInterface $key
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* @param integer $memsize
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* @param integer $perm
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*/
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public function __construct(KeyInterface $key, int $memsize = 64000, int $perm = 0666)
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{
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if (!($shm_resource = shm_attach($key->getKey(), $memsize, $perm))) {
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throw new \RuntimeException("Unable to attach shm resource {$key}");
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}
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$this->resource = $shm_resource;
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}
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/**
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* Destructor
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*/
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public function __destruct()
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{
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shm_detach($this->resource);
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}
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/**
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* Destroy the shm segment
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*
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* @return void
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*/
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public function destroy()
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{
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shm_remove($this->resource);
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}
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/**
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* {@inheritDoc}
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*
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* @param int $offset
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* @return void
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*/
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public function offsetExists($offset)
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{
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return shm_has_var($this->resource, $offset);
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}
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/**
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* {@inheritDoc}
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*
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* @param int $offset
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* @return mixed
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*/
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public function offsetGet($offset)
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{
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return shm_has_var($this->resource, $offset)?shm_get_var($this->resource, $offset):null;
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}
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/**
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* {@inheritDoc}
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*
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* @param int $offset
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* @param mixed $value
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* @return void
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*/
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public function offsetSet($offset, $value)
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{
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shm_put_var($this->resource, $offset, $value);
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}
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/**
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* {@inheritDoc}
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*
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* @param int $offset
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* @return void
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*/
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public function offsetUnset($offset)
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{
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shm_remove_var($this->resource, $offset);
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}
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} |