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#pragma once
#include "public.h"
#include "spin_lock_base.h"
#include "spin_lock_count.h"
#include <library/cpp/yt/system/thread_id.h>
#include <util/system/types.h>
#include <atomic>
namespace NYT::NThreading {
////////////////////////////////////////////////////////////////////////////////
//! A counterpart of #TSpinLock that can be acquired from a single thread multiple times.
class TRecursiveSpinLock
: public TSpinLockBase
{
public:
using TSpinLockBase::TSpinLockBase;
void Acquire() noexcept;
bool TryAcquire() noexcept;
void Release() noexcept;
bool IsLocked() const noexcept;
bool IsLockedByCurrentThread() const noexcept;
private:
// Bits 0..31: recursion depth; if zero then the lock is not taken,
// thread id can be arbitrary
// Bits 32..63: id of the thread owning the lock
using TValue = ui64;
std::atomic<TValue> Value_ = 0;
static constexpr int ThreadIdShift = 32;
static constexpr TValue RecursionDepthMask = (1ULL << ThreadIdShift) - 1;
static_assert(sizeof(TSequentialThreadId) == 4);
bool TryAndTryAcquire() noexcept;
void AcquireSlow() noexcept;
};
REGISTER_TRACKED_SPIN_LOCK_CLASS(TRecursiveSpinLock)
////////////////////////////////////////////////////////////////////////////////
} // namespace NYT::NThreading
#define RECURSIVE_SPIN_LOCK_INL_H_
#include "recursive_spin_lock-inl.h"
#undef RECURSIVE_SPIN_LOCK_INL_H_
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