Initial commit

src/Shm/SharedMemory.php

@@ -0,0 +1,94 @@
+<?php
+
+namespace NoccyLabs\Ipc\Shm;
+
+use NoccyLabs\Ipc\Key\KeyInterface;
+
+/**
+ * Shared memory segment
+ */
+class SharedMemory implements \ArrayAccess
+{
+
+    protected $resource;
+
+    /**
+     * Constructor
+     *
+     * @param KeyInterface $key
+     * @param integer $memsize
+     * @param integer $perm
+     */
+    public function __construct(KeyInterface $key, int $memsize = 64000, int $perm = 0666)
+    {
+        if (!($shm_resource = shm_attach($key->getKey(), $memsize, $perm))) {
+            throw new \RuntimeException("Unable to attach shm resource {$key}");
+        }
+        
+        $this->resource = $shm_resource;
+    }
+
+    /**
+     * Destructor
+     */
+    public function __destruct()
+    {
+        shm_detach($this->resource);
+        
+    }
+
+    /**
+     * Destroy the shm segment
+     *
+     * @return void
+     */
+    public function destroy()
+    {
+        shm_remove($this->resource);
+    }
+    
+    /**
+     * {@inheritDoc}
+     *
+     * @param int $offset
+     * @return void
+     */
+    public function offsetExists($offset)
+    {
+        return shm_has_var($this->resource, $offset);
+    }
+
+    /**
+     * {@inheritDoc}
+     *
+     * @param int $offset
+     * @return mixed
+     */
+    public function offsetGet($offset)
+    {
+        return shm_has_var($this->resource, $offset)?shm_get_var($this->resource, $offset):null;
+    }
+
+    /**
+     * {@inheritDoc}
+     *
+     * @param int $offset
+     * @param mixed $value
+     * @return void
+     */
+    public function offsetSet($offset, $value)
+    {
+        shm_put_var($this->resource, $offset, $value);
+    }
+
+    /**
+     * {@inheritDoc}
+     *
+     * @param int $offset
+     * @return void
+     */
+    public function offsetUnset($offset)
+    {
+        shm_remove_var($this->resource, $offset);
+    }
+}