Consistently use Atomic, and not std::atomic

Atomic enforces usage of its only safe constructor,
in contrast to std::atomic.

"The default-initialized std::atomic<T> does not contain
a T object, and its only valid uses are destruction and
initialization by std::atomic_init, see LWG issue 2334."
 -- https://en.cppreference.com/w/cpp/atomic/atomic/atomic

lib/base/io-engine.cpp

@@ -85,10 +85,11 @@ boost::asio::io_context& IoEngine::GetIoContext()
 	return m_IoContext;
 }
 
-IoEngine::IoEngine() : m_IoContext(), m_KeepAlive(boost::asio::make_work_guard(m_IoContext)), m_Threads(decltype(m_Threads)::size_type(Configuration::Concurrency * 2u)), m_AlreadyExpiredTimer(m_IoContext)
+IoEngine::IoEngine() : m_IoContext(), m_KeepAlive(boost::asio::make_work_guard(m_IoContext)),
+	m_Threads(decltype(m_Threads)::size_type(Configuration::Concurrency * 2u)),
+	m_AlreadyExpiredTimer(m_IoContext), m_CpuBoundSemaphore(Configuration::Concurrency * 3u / 2u)
 {
 	m_AlreadyExpiredTimer.expires_at(boost::posix_time::neg_infin);
-	m_CpuBoundSemaphore.store(Configuration::Concurrency * 3u / 2u);
 
 	for (auto& thread : m_Threads) {
 		thread = std::thread(&IoEngine::RunEventLoop, this);

lib/base/io-engine.hpp

@@ -3,11 +3,12 @@
 #ifndef IO_ENGINE_H
 #define IO_ENGINE_H
 
+#include "base/atomic.hpp"
 #include "base/exception.hpp"
 #include "base/lazy-init.hpp"
 #include "base/logger.hpp"
 #include "base/shared-object.hpp"
-#include <atomic>
+#include <cstdint>
 #include <exception>
 #include <memory>
 #include <thread>
@@ -135,7 +136,7 @@ class IoEngine
 	boost::asio::executor_work_guard<boost::asio::io_context::executor_type> m_KeepAlive;
 	std::vector<std::thread> m_Threads;
 	boost::asio::deadline_timer m_AlreadyExpiredTimer;
-	std::atomic_int_fast32_t m_CpuBoundSemaphore;
+	Atomic<int_fast32_t> m_CpuBoundSemaphore;
 };
 
 class TerminateIoThread : public std::exception
@@ -176,7 +177,6 @@ class Timeout : public SharedObject
 	{
 		Ptr keepAlive (this);
 
-		m_Cancelled.store(false);
 		m_Timer.expires_from_now(std::move(timeoutFromNow));
 
 		IoEngine::SpawnCoroutine(executor, [this, keepAlive, onTimeout](boost::asio::yield_context yc) {
@@ -207,7 +207,7 @@ class Timeout : public SharedObject
 
 private:
 	boost::asio::deadline_timer m_Timer;
-	std::atomic<bool> m_Cancelled;
+	Atomic<bool> m_Cancelled {false};
 };
 
 }

lib/base/lazy-init.hpp

@@ -3,7 +3,7 @@
 #ifndef LAZY_INIT
 #define LAZY_INIT
 
-#include <atomic>
+#include "base/atomic.hpp"
 #include <functional>
 #include <mutex>
 #include <utility>
@@ -24,7 +24,6 @@ class LazyInit
 	inline
 	LazyInit(std::function<T()> initializer = []() { return T(); }) : m_Initializer(std::move(initializer))
 	{
-		m_Underlying.store(nullptr, std::memory_order_release);
 	}
 
 	LazyInit(const LazyInit&) = delete;
@@ -64,7 +63,7 @@ class LazyInit
 private:
 	std::function<T()> m_Initializer;
 	std::mutex m_Mutex;
-	std::atomic<T*> m_Underlying;
+	Atomic<T*> m_Underlying {nullptr};
 };
 
 }

lib/base/logger.cpp

@@ -33,7 +33,7 @@ REGISTER_TYPE(Logger);
 std::set<Logger::Ptr> Logger::m_Loggers;
 std::mutex Logger::m_Mutex;
 bool Logger::m_ConsoleLogEnabled = true;
-std::atomic<bool> Logger::m_EarlyLoggingEnabled (true);
+Atomic<bool> Logger::m_EarlyLoggingEnabled (true);
 bool Logger::m_TimestampEnabled = true;
 LogSeverity Logger::m_ConsoleLogSeverity = LogInformation;
 std::mutex Logger::m_UpdateMinLogSeverityMutex;

lib/base/logger.hpp

@@ -99,7 +99,7 @@ class Logger : public ObjectImpl<Logger>
 	static std::mutex m_Mutex;
 	static std::set<Logger::Ptr> m_Loggers;
 	static bool m_ConsoleLogEnabled;
-	static std::atomic<bool> m_EarlyLoggingEnabled;
+	static Atomic<bool> m_EarlyLoggingEnabled;
 	static bool m_TimestampEnabled;
 	static LogSeverity m_ConsoleLogSeverity;
 	static std::mutex m_UpdateMinLogSeverityMutex;

lib/base/namespace.hpp

@@ -4,11 +4,11 @@
 #define NAMESPACE_H
 
 #include "base/i2-base.hpp"
+#include "base/atomic.hpp"
 #include "base/object.hpp"
 #include "base/shared-object.hpp"
 #include "base/value.hpp"
 #include "base/debuginfo.hpp"
-#include <atomic>
 #include <map>
 #include <vector>
 #include <memory>
@@ -92,7 +92,7 @@ class Namespace final : public Object
 	std::map<String, NamespaceValue> m_Data;
 	mutable std::shared_timed_mutex m_DataMutex;
 	bool m_ConstValues;
-	std::atomic<bool> m_Frozen;
+	Atomic<bool> m_Frozen;
 };
 
 Namespace::Iterator begin(const Namespace::Ptr& x);

lib/base/object.cpp

@@ -27,11 +27,6 @@ static Timer::Ptr l_ObjectCountTimer;
  */
 Object::Object()
 {
-	m_References.store(0);
-
-#ifdef I2_DEBUG
-	m_LockOwner.store(decltype(m_LockOwner.load())());
-#endif /* I2_DEBUG */
 }
 
 /**

lib/base/object.hpp

@@ -4,9 +4,9 @@
 #define OBJECT_H
 
 #include "base/i2-base.hpp"
+#include "base/atomic.hpp"
 #include "base/debug.hpp"
 #include <boost/smart_ptr/intrusive_ptr.hpp>
-#include <atomic>
 #include <cstddef>
 #include <cstdint>
 #include <mutex>
@@ -191,11 +191,11 @@ class Object
 	Object(const Object& other) = delete;
 	Object& operator=(const Object& rhs) = delete;
 
-	std::atomic<uint_fast64_t> m_References;
+	Atomic<uint_fast64_t> m_References {0};
 	mutable std::recursive_mutex m_Mutex;
 
 #ifdef I2_DEBUG
-	mutable std::atomic<std::thread::id> m_LockOwner;
+	mutable Atomic<std::thread::id> m_LockOwner {std::thread::id()};
 	mutable size_t m_LockCount = 0;
 #endif /* I2_DEBUG */
 

lib/base/tlsstream.hpp

@@ -4,13 +4,13 @@
 #define TLSSTREAM_H
 
 #include "base/i2-base.hpp"
+#include "base/atomic.hpp"
 #include "base/shared.hpp"
 #include "base/socket.hpp"
 #include "base/stream.hpp"
 #include "base/tlsutility.hpp"
 #include "base/fifo.hpp"
 #include "base/utility.hpp"
-#include <atomic>
 #include <memory>
 #include <utility>
 #include <boost/asio/buffered_stream.hpp>
@@ -30,7 +30,6 @@ class SeenStream : public ARS
 	template<class... Args>
 	SeenStream(Args&&... args) : ARS(std::forward<Args>(args)...)
 	{
-		m_Seen.store(nullptr);
 	}
 
 	template<class... Args>
@@ -53,7 +52,7 @@ class SeenStream : public ARS
 	}
 
 private:
-	std::atomic<double*> m_Seen;
+	Atomic<double*> m_Seen {nullptr};
 };
 
 struct UnbufferedAsioTlsStreamParams

lib/base/workqueue.cpp

@@ -11,7 +11,7 @@
 
 using namespace icinga;
 
-std::atomic<int> WorkQueue::m_NextID(1);
+Atomic<int> WorkQueue::m_NextID (1);
 boost::thread_specific_ptr<WorkQueue *> l_ThreadWorkQueue;
 
 WorkQueue::WorkQueue(size_t maxItems, int threadCount, LogSeverity statsLogLevel)

lib/base/workqueue.hpp

@@ -4,6 +4,7 @@
 #define WORKQUEUE_H
 
 #include "base/i2-base.hpp"
+#include "base/atomic.hpp"
 #include "base/timer.hpp"
 #include "base/ringbuffer.hpp"
 #include "base/logger.hpp"
@@ -13,7 +14,6 @@
 #include <mutex>
 #include <queue>
 #include <deque>
-#include <atomic>
 
 namespace icinga
 {
@@ -122,7 +122,7 @@ class WorkQueue
 private:
 	int m_ID;
 	String m_Name;
-	static std::atomic<int> m_NextID;
+	static Atomic<int> m_NextID;
 	int m_ThreadCount;
 	bool m_Spawned{false};
 

lib/config/applyrule.hpp

@@ -5,11 +5,11 @@
 
 #include "config/i2-config.hpp"
 #include "config/expression.hpp"
+#include "base/atomic.hpp"
 #include "base/debuginfo.hpp"
 #include "base/shared-object.hpp"
 #include "base/type.hpp"
 #include <unordered_map>
-#include <atomic>
 
 namespace icinga
 {
@@ -104,7 +104,7 @@ class ApplyRule : public SharedObject
 	bool m_IgnoreOnError;
 	DebugInfo m_DebugInfo;
 	Dictionary::Ptr m_Scope;
-	std::atomic<bool> m_HasMatches;
+	Atomic<bool> m_HasMatches;
 
 	static TypeMap m_Types;
 	static RuleMap m_Rules;

lib/config/configitem.cpp

@@ -6,6 +6,7 @@
 #include "config/objectrule.hpp"
 #include "config/configcompiler.hpp"
 #include "base/application.hpp"
+#include "base/atomic.hpp"
 #include "base/configtype.hpp"
 #include "base/objectlock.hpp"
 #include "base/convert.hpp"
@@ -21,7 +22,6 @@
 #include "base/function.hpp"
 #include "base/utility.hpp"
 #include <boost/algorithm/string/join.hpp>
-#include <atomic>
 #include <sstream>
 #include <fstream>
 #include <algorithm>
@@ -447,7 +447,7 @@ bool ConfigItem::CommitNewItems(const ActivationContext::Ptr& context, WorkQueue
 	int itemsCount {0};
 
 	for (auto& type : Type::GetConfigTypesSortedByLoadDependencies()) {
-		std::atomic<int> committed_items(0);
+		Atomic committed_items (0);
 
 		{
 			auto items (itemsByType.find(type.get()));
@@ -493,7 +493,7 @@ bool ConfigItem::CommitNewItems(const ActivationContext::Ptr& context, WorkQueue
 #endif /* I2_DEBUG */
 
 	for (auto& type : Type::GetConfigTypesSortedByLoadDependencies()) {
-		std::atomic<int> notified_items(0);
+		Atomic notified_items (0);
 
 		{
 			auto items (itemsByType.find(type.get()));

lib/icinga/scheduleddowntime.cpp

@@ -390,4 +390,4 @@ bool ScheduledDowntime::AllConfigIsLoaded()
 	return m_AllConfigLoaded.load();
 }
 
-std::atomic<bool> ScheduledDowntime::m_AllConfigLoaded (false);
+Atomic<bool> ScheduledDowntime::m_AllConfigLoaded (false);

lib/icinga/scheduleddowntime.hpp

@@ -4,9 +4,9 @@
 #define SCHEDULEDDOWNTIME_H
 
 #include "icinga/i2-icinga.hpp"
+#include "base/atomic.hpp"
 #include "icinga/scheduleddowntime-ti.hpp"
 #include "icinga/checkable.hpp"
-#include <atomic>
 
 namespace icinga
 {
@@ -49,7 +49,7 @@ class ScheduledDowntime final : public ObjectImpl<ScheduledDowntime>
 	void CreateNextDowntime();
 	void RemoveObsoleteDowntimes();
 
-	static std::atomic<bool> m_AllConfigLoaded;
+	static Atomic<bool> m_AllConfigLoaded;
 
 	static bool EvaluateApplyRuleInstance(const Checkable::Ptr& checkable, const String& name, ScriptFrame& frame, const ApplyRule& rule, bool skipFilter);
 	static bool EvaluateApplyRule(const Checkable::Ptr& checkable, const ApplyRule& rule, bool skipFilter = false);

lib/icingadb/icingadb.hpp

@@ -14,8 +14,8 @@
 #include "icinga/service.hpp"
 #include "icinga/downtime.hpp"
 #include "remote/messageorigin.hpp"
-#include <atomic>
 #include <chrono>
+#include <cstddef>
 #include <future>
 #include <memory>
 #include <mutex>
@@ -222,7 +222,7 @@ class IcingaDB : public ObjectImpl<IcingaDB>
 	// syncronization to m_Rcon within the IcingaDB feature itself.
 	Locked<RedisConnection::Ptr> m_RconLocked;
 	std::unordered_map<ConfigType*, RedisConnection::Ptr> m_Rcons;
-	std::atomic_size_t m_PendingRcons;
+	Atomic<size_t> m_PendingRcons {0};
 
 	struct {
 		DumpedGlobals CustomVar, ActionUrl, NotesUrl, IconImage;

lib/perfdata/influxdbcommonwriter.hpp

@@ -5,6 +5,7 @@
 
 #include "perfdata/influxdbcommonwriter-ti.hpp"
 #include "icinga/service.hpp"
+#include "base/atomic.hpp"
 #include "base/configobject.hpp"
 #include "base/perfdatavalue.hpp"
 #include "base/tcpsocket.hpp"
@@ -14,7 +15,7 @@
 #include "remote/url.hpp"
 #include <boost/beast/http/message.hpp>
 #include <boost/beast/http/string_body.hpp>
-#include <atomic>
+#include <cstddef>
 #include <fstream>
 
 namespace icinga
@@ -51,7 +52,7 @@ class InfluxdbCommonWriter : public ObjectImpl<InfluxdbCommonWriter>
 	Timer::Ptr m_FlushTimer;
 	WorkQueue m_WorkQueue{10000000, 1};
 	std::vector<String> m_DataBuffer;
-	std::atomic_size_t m_DataBufferSize{0};
+	Atomic<size_t> m_DataBufferSize {0};
 
 	void CheckResultHandler(const Checkable::Ptr& checkable, const CheckResult::Ptr& cr);
 	void CheckResultHandlerWQ(const Checkable::Ptr& checkable, const CheckResult::Ptr& cr);

lib/remote/apilistener-authority.cpp

@@ -8,7 +8,7 @@
 
 using namespace icinga;
 
-std::atomic<bool> ApiListener::m_UpdatedObjectAuthority (false);
+Atomic<bool> ApiListener::m_UpdatedObjectAuthority (false);
 
 void ApiListener::UpdateObjectAuthority()
 {

lib/remote/apilistener.hpp

@@ -8,6 +8,7 @@
 #include "remote/httpserverconnection.hpp"
 #include "remote/endpoint.hpp"
 #include "remote/messageorigin.hpp"
+#include "base/atomic.hpp"
 #include "base/configobject.hpp"
 #include "base/process.hpp"
 #include "base/shared.hpp"
@@ -16,7 +17,6 @@
 #include "base/tcpsocket.hpp"
 #include "base/tlsstream.hpp"
 #include "base/threadpool.hpp"
-#include <atomic>
 #include <boost/asio/io_context.hpp>
 #include <boost/asio/ip/tcp.hpp>
 #include <boost/asio/spawn.hpp>
@@ -179,7 +179,7 @@ class ApiListener final : public ObjectImpl<ApiListener>
 	Endpoint::Ptr m_LocalEndpoint;
 
 	static ApiListener::Ptr m_Instance;
-	static std::atomic<bool> m_UpdatedObjectAuthority;
+	static Atomic<bool> m_UpdatedObjectAuthority;
 
 	void ApiTimerHandler();
 	void ApiReconnectTimerHandler();

lib/remote/configstageshandler.cpp

@@ -12,7 +12,7 @@ using namespace icinga;
 
 REGISTER_URLHANDLER("/v1/config/stages", ConfigStagesHandler);
 
-std::atomic<bool> ConfigStagesHandler::m_RunningPackageUpdates (false);
+Atomic<bool> ConfigStagesHandler::m_RunningPackageUpdates (false);
 
 bool ConfigStagesHandler::HandleRequest(
 	AsioTlsStream& stream,