Introduce AtomicDuration

lib/base/atomic.hpp

@@ -4,6 +4,7 @@
 #define ATOMIC_H
 
 #include <atomic>
+#include <chrono>
 #include <mutex>
 #include <type_traits>
 #include <utility>
@@ -34,6 +35,43 @@ public:
 	}
 };
 
+/**
+ * Accumulates time durations atomically.
+ *
+ * @ingroup base
+ */
+class AtomicDuration
+{
+public:
+	using Clock = std::chrono::steady_clock;
+
+	/**
+	 * Adds the elapsedTime to this instance.
+	 *
+	 * May be called multiple times to accumulate time.
+	 *
+	 * @param elapsedTime The distance between two time points
+	 *
+	 * @return This instance for method chaining
+	 */
+	AtomicDuration& operator+=(const Clock::duration& elapsedTime) noexcept
+	{
+		m_Sum.fetch_add(elapsedTime.count(), std::memory_order_relaxed);
+		return *this;
+	}
+
+	/**
+	 * @return The total accumulated time in seconds
+	 */
+	operator double() const noexcept
+	{
+		return std::chrono::duration<double>(Clock::duration(m_Sum.load(std::memory_order_relaxed))).count();
+	}
+
+private:
+	Atomic<Clock::duration::rep> m_Sum {0};
+};
+
 /**
  * Wraps any T into a std::atomic<T>-like interface that locks using a mutex.
  *

test/CMakeLists.txt

@@ -89,6 +89,7 @@ set(base_test_SOURCES
   icingaapplication-fixture.cpp
   utils.cpp
   base-array.cpp
+  base-atomic.cpp
   base-base64.cpp
   base-convert.cpp
   base-dictionary.cpp

test/base-atomic.cpp

@@ -0,0 +1,34 @@
+/* Icinga 2 | (c) 2025 Icinga GmbH | GPLv2+ */
+
+#include "base/atomic.hpp"
+#include <BoostTestTargetConfig.h>
+
+using namespace icinga;
+
+BOOST_AUTO_TEST_SUITE(base_atomic)
+
+BOOST_AUTO_TEST_CASE(duration_none)
+{
+	BOOST_CHECK_EQUAL(static_cast<double>(AtomicDuration()), 0);
+}
+
+BOOST_AUTO_TEST_CASE(duration_one)
+{
+	AtomicDuration sum;
+
+	sum += std::chrono::seconds(1);
+
+	BOOST_CHECK_EQUAL(static_cast<double>(sum), 1);
+}
+
+BOOST_AUTO_TEST_CASE(duration_two)
+{
+	AtomicDuration sum;
+
+	sum += std::chrono::seconds(1);
+	sum += std::chrono::seconds(2);
+
+	BOOST_CHECK_EQUAL(static_cast<double>(sum), 3);
+}
+
+BOOST_AUTO_TEST_SUITE_END()