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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <mutex>
#include <condition_variable>
namespace vespalib {
class RetainGuard;
/*
* Class containing a reference count that can be waited on to become zero.
* Typically ancestor or member of a class that has to be careful of when
* portions object can be properly torn down before destruction itself.
*/
class MonitoredRefCount
{
std::mutex _lock;
std::condition_variable _cv;
uint32_t _refCount;
void retain() noexcept;
void release() noexcept;
friend RetainGuard;
public:
MonitoredRefCount();
virtual ~MonitoredRefCount();
void waitForZeroRefCount();
bool has_zero_ref_count();
};
}
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