added rwlock class

include/thallium/rwlock.hpp

+/*
+ * Copyright (c) 2017 UChicago Argonne, LLC
+ *
+ * See COPYRIGHT in top-level directory.
+ */
+
+#ifndef __THALLIUM_RWLOCK_HPP
+#define __THALLIUM_RWLOCK_HPP
+
+#include <abt.h>
+
+namespace thallium {
+
+/**
+ * @brief The rwlock class wraps and managed an ABT_rwlock.
+ */
+class rwlock {
+	
+	ABT_rwlock m_lock;
+
+	public:
+
+    /**
+     * @brief Native handle type.
+     */
+    typedef ABT_rwlock native_handle_type;
+
+    /**
+     * @brief Constructor.
+     */
+	explicit rwlock() {
+		ABT_rwlock_create(&m_lock);
+	}
+
+    /**
+     * @brief Copy constructor is deleted.
+     */
+	rwlock(const rwlock&) = delete;
+
+    /**
+     * @brief Move constructor.
+     */
+	rwlock(rwlock&& other) {
+		m_lock = other.m_lock;
+		other.m_lock = ABT_RWLOCK_NULL;
+	}
+
+    /**
+     * @brief Copy assignment operator is deleted.
+     */
+    rwlock& operator=(const rwlock&) = delete;
+
+    /**
+     * @brief Move assignment operator.
+     */
+    rwlock& operator=(rwlock&& other) {
+        if(this == &other) return *this;
+        ABT_rwlock_free(&m_lock);
+        m_lock = other.m_lock;
+        other.m_lock = ABT_RWLOCK_NULL;
+    }
+
+    /**
+     * @brief Destructor.
+     */
+	~rwlock() noexcept {
+		ABT_rwlock_free(&m_lock);
+	}
+
+    /**
+     * @brief Lock for reading.
+     */
+	void rdlock() noexcept {
+		ABT_rwlock_rdlock(m_lock);
+	}
+
+    /**
+     * @brief Lock for writing.
+     */
+	void wrlock() noexcept {
+	    ABT_rwlock_wrlock(m_lock);
+	}
+
+    /**
+     * @brief Unlock.
+     */
+	void unlock() noexcept {
+		ABT_rwlock_unlock(m_lock);
+	}
+
+    /**
+     * @brief Get the underlying native handle.
+     *
+     * @return the underlying native handle.
+     */
+    native_handle_type native_handle() const noexcept {
+        return m_lock;
+    }
+};
+
+} 
+
+#endif /* end of include guard */