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#pragma once
#include <util/system/guard.h>
#include <util/system/defaults.h>
#include <util/system/yassert.h>
#include <atomic>
template <class TCounterCheckPolicy>
class TSimpleCounterTemplate: public TCounterCheckPolicy {
using TCounterCheckPolicy::Check;
public:
inline TSimpleCounterTemplate(long initial = 0) noexcept
: Counter_(initial)
{
}
inline ~TSimpleCounterTemplate() {
Check();
}
inline intptr_t Add(intptr_t d) noexcept {
Check();
return Counter_ += d;
}
inline intptr_t Inc() noexcept {
return Add(1);
}
inline intptr_t Sub(intptr_t d) noexcept {
Check();
return Counter_ -= d;
}
inline intptr_t Dec() noexcept {
return Sub(1);
}
inline bool TryWeakInc() noexcept {
if (!Counter_) {
return false;
}
Inc();
Y_ASSERT(Counter_ != 0);
return true;
}
inline intptr_t Val() const noexcept {
return Counter_;
}
private:
intptr_t Counter_;
};
class TNoCheckPolicy {
protected:
inline void Check() const {
}
};
#if defined(SIMPLE_COUNTER_THREAD_CHECK)
#include <util/system/thread.i>
class TCheckPolicy {
public:
inline TCheckPolicy() {
ThreadId = SystemCurrentThreadId();
}
protected:
inline void Check() const {
Y_VERIFY(ThreadId == SystemCurrentThreadId(), "incorrect usage of TSimpleCounter");
}
private:
size_t ThreadId;
};
#else
using TCheckPolicy = TNoCheckPolicy;
#endif
// Use this one if access from multiple threads to your pointer is an error and you want to enforce thread checks
using TSimpleCounter = TSimpleCounterTemplate<TCheckPolicy>;
// Use this one if you do want to share the pointer between threads, omit thread checks and do the synchronization yourself
using TExplicitSimpleCounter = TSimpleCounterTemplate<TNoCheckPolicy>;
template <class TCounterCheckPolicy>
struct TCommonLockOps<TSimpleCounterTemplate<TCounterCheckPolicy>> {
static inline void Acquire(TSimpleCounterTemplate<TCounterCheckPolicy>* t) noexcept {
t->Inc();
}
static inline void Release(TSimpleCounterTemplate<TCounterCheckPolicy>* t) noexcept {
t->Dec();
}
};
class TAtomicCounter {
public:
inline TAtomicCounter(long initial = 0) noexcept
: Counter_(initial)
{
}
TAtomicCounter(const TAtomicCounter& other)
: Counter_(other.Counter_.load())
{
}
TAtomicCounter& operator=(const TAtomicCounter& other) {
Counter_.store(other.Counter_.load());
return *this;
}
inline ~TAtomicCounter() = default;
inline intptr_t Add(intptr_t d) noexcept {
return Counter_ += d;
}
inline intptr_t Inc() noexcept {
return Add(1);
}
inline intptr_t Sub(intptr_t d) noexcept {
return Counter_ -= d;
}
inline intptr_t Dec() noexcept {
return Sub(1);
}
inline intptr_t Val() const noexcept {
return Counter_.load();
}
inline bool TryWeakInc() noexcept {
for (auto curValue = Counter_.load(std::memory_order_acquire);;) {
if (!curValue) {
return false;
}
if (Counter_.compare_exchange_weak(curValue, curValue + 1)) {
return true;
}
}
}
private:
std::atomic<intptr_t> Counter_;
};
template <>
struct TCommonLockOps<TAtomicCounter> {
static inline void Acquire(TAtomicCounter* t) noexcept {
t->Inc();
}
static inline void Release(TAtomicCounter* t) noexcept {
t->Dec();
}
};
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