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#pragma once
#include "atomic.h"
#include "spin_wait.h"
class TSpinLockBase {
protected:
inline TSpinLockBase() noexcept {
AtomicSet(Val_, 0);
}
public:
inline bool IsLocked() const noexcept {
return AtomicGet(Val_);
}
inline bool TryAcquire() noexcept {
return AtomicTryLock(&Val_);
}
inline bool try_lock() noexcept {
return TryAcquire();
}
protected:
TAtomic Val_;
};
static inline void SpinLockPause() {
#if defined(__GNUC__) && (defined(_i386_) || defined(_x86_64_))
__asm __volatile("pause");
#endif
}
static inline void AcquireSpinLock(TAtomic* l) {
if (!AtomicTryLock(l)) {
do {
SpinLockPause();
} while (!AtomicTryAndTryLock(l));
}
}
static inline void ReleaseSpinLock(TAtomic* l) {
AtomicUnlock(l);
}
/*
* You should almost always use TAdaptiveLock instead of TSpinLock
*/
class TSpinLock: public TSpinLockBase {
public:
using TSpinLockBase::TSpinLockBase;
inline void Release() noexcept {
ReleaseSpinLock(&Val_);
}
inline void Acquire() noexcept {
AcquireSpinLock(&Val_);
}
inline void unlock() noexcept {
Release();
}
inline void lock() noexcept {
Acquire();
}
};
static inline void AcquireAdaptiveLock(TAtomic* l) {
if (!AtomicTryLock(l)) {
TSpinWait sw;
while (!AtomicTryAndTryLock(l)) {
sw.Sleep();
}
}
}
static inline void ReleaseAdaptiveLock(TAtomic* l) {
AtomicUnlock(l);
}
class TAdaptiveLock: public TSpinLockBase {
public:
using TSpinLockBase::TSpinLockBase;
inline void Release() noexcept {
ReleaseAdaptiveLock(&Val_);
}
inline void Acquire() noexcept {
AcquireAdaptiveLock(&Val_);
}
inline void unlock() noexcept {
Release();
}
inline void lock() noexcept {
Acquire();
}
};
#include "guard.h"
template <>
struct TCommonLockOps<TAtomic> {
static inline void Acquire(TAtomic* v) noexcept {
AcquireAdaptiveLock(v);
}
static inline bool TryAcquire(TAtomic* v) noexcept {
return AtomicTryLock(v);
}
static inline void Release(TAtomic* v) noexcept {
ReleaseAdaptiveLock(v);
}
};
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