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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <thread>
namespace vespalib {
/**
* Provides a hint to malloc implementation that all allocations in the scope of this guard
* will use mmap directly for allocation larger than the given limit.
* NB !! Note that guards can not be nested. Intention is to use around third party libraries where
* you do not control allocation yourself.
* The effect is implementation dependent. vespamalloc applies this only for the calling thread.
**/
class MallocMmapGuard
{
public:
MallocMmapGuard(size_t mmapLimit);
MallocMmapGuard(const MallocMmapGuard &) = delete;
MallocMmapGuard & operator=(const MallocMmapGuard &) = delete;
MallocMmapGuard(MallocMmapGuard &&) = delete;
MallocMmapGuard & operator=(MallocMmapGuard &&) = delete;
~MallocMmapGuard();
private:
std::thread::id _threadId;
};
} // namespace vespalib
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