Remove SpinLock

No longer needed as its only user now uses std::mutex.

lib/base/CMakeLists.txt

@@ -64,7 +64,6 @@ set(base_SOURCES
   shared-object.hpp
   singleton.hpp
   socket.cpp socket.hpp
-  spinlock.cpp spinlock.hpp
   stacktrace.cpp stacktrace.hpp
   statsfunction.hpp
   stdiostream.cpp stdiostream.hpp

lib/base/spinlock.cpp

@@ -1,22 +0,0 @@
-/* Icinga 2 | (c) 2020 Icinga GmbH | GPLv2+ */
-
-#include "base/spinlock.hpp"
-#include <atomic>
-
-using namespace icinga;
-
-void SpinLock::lock()
-{
-	while (m_Locked.test_and_set(std::memory_order_acquire)) {
-	}
-}
-
-bool SpinLock::try_lock()
-{
-	return !m_Locked.test_and_set(std::memory_order_acquire);
-}
-
-void SpinLock::unlock()
-{
-	m_Locked.clear(std::memory_order_release);
-}

lib/base/spinlock.hpp

@@ -1,35 +0,0 @@
-/* Icinga 2 | (c) 2020 Icinga GmbH | GPLv2+ */
-
-#ifndef SPINLOCK_H
-#define SPINLOCK_H
-
-#include <atomic>
-
-namespace icinga
-{
-
-/**
- * A spin lock.
- *
- * @ingroup base
- */
-class SpinLock
-{
-public:
-	SpinLock() = default;
-	SpinLock(const SpinLock&) = delete;
-	SpinLock& operator=(const SpinLock&) = delete;
-	SpinLock(SpinLock&&) = delete;
-	SpinLock& operator=(SpinLock&&) = delete;
-
-	void lock();
-	bool try_lock();
-	void unlock();
-
-private:
-	std::atomic_flag m_Locked = ATOMIC_FLAG_INIT;
-};
-
-}
-
-#endif /* SPINLOCK_H */