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/* Icinga 2 | (c) 2025 Icinga GmbH | GPLv2+ */
#pragma once
#include "base/object.hpp"
#include "base/atomic.hpp"
#include <condition_variable>
#include <cstdint>
#include <mutex>
namespace icinga
{
/**
* A synchronization interface that allows concurrent shared locking.
*
* @ingroup base
*/
class WaitGroup : public Object
{
public:
DECLARE_PTR_TYPEDEFS(WaitGroup);
virtual bool try_lock_shared() = 0;
virtual void unlock_shared() = 0;
virtual bool IsLockable() const = 0;
};
/**
* A thread-safe wait group that can be stopped to prevent further shared locking.
*
* @ingroup base
*/
class StoppableWaitGroup : public WaitGroup
{
public:
DECLARE_PTR_TYPEDEFS(StoppableWaitGroup);
StoppableWaitGroup() = default;
StoppableWaitGroup(const StoppableWaitGroup&) = delete;
StoppableWaitGroup(StoppableWaitGroup&&) = delete;
StoppableWaitGroup& operator=(const StoppableWaitGroup&) = delete;
StoppableWaitGroup& operator=(StoppableWaitGroup&&) = delete;
bool try_lock_shared() override;
void unlock_shared() override;
bool IsLockable() const override;
void Join();
private:
std::mutex m_Mutex;
std::condition_variable m_CV;
uint_fast32_t m_SharedLocks = 0;
Atomic<bool> m_Stopped = false;
};
}
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