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/*
* Copyright (C) 2017-2020 Intel Corporation
*
* SPDX-License-Identifier: MIT
*
*/
#pragma once
#include "shared/source/helpers/debug_helpers.h"
#include <atomic>
#include <memory>
#include <type_traits>
namespace NEO {
template <typename CT = int32_t>
class RefCounter {
public:
RefCounter()
: val(0) {
}
CT peek() const {
CT curr = val.load();
DEBUG_BREAK_IF(curr < 0);
return curr;
}
void inc() {
CT curr = ++val;
DEBUG_BREAK_IF(curr < 1);
UNUSED_VARIABLE(curr);
}
bool dec() {
CT curr = --val;
DEBUG_BREAK_IF(curr < 0);
return (curr == 0);
}
CT decAndReturnCurrent() {
return --val;
}
bool peekIsZero() const {
return (val == 0);
}
protected:
std::atomic<CT> val;
};
template <typename DerivedClass>
class ReferenceTrackedObject;
template <typename DataType>
class unique_ptr_if_unused : public std::unique_ptr<DataType, void (*)(DataType *)> {
using DeleterFuncType = void (*)(DataType *);
public:
unique_ptr_if_unused()
: std::unique_ptr<DataType, DeleterFuncType>(nullptr, dontDelete) {
}
unique_ptr_if_unused(DataType *ptr, bool unused, DeleterFuncType customDeleter = nullptr)
: std::unique_ptr<DataType, DeleterFuncType>(ptr, unused ? chooseDeleter(ptr, customDeleter) : dontDelete) {
}
bool isUnused() const {
return (this->get_deleter() != dontDelete);
}
private:
static DeleterFuncType chooseDeleter(DataType *inPtr, DeleterFuncType customDeleter) {
DeleterFuncType deleter = customDeleter;
if (customDeleter == nullptr) {
deleter = getObjDeleter(inPtr);
}
if (deleter == nullptr) {
deleter = &doDelete;
}
return deleter;
}
template <typename DT = DataType>
static typename std::enable_if<std::is_base_of<ReferenceTrackedObject<DataType>, DT>::value, DeleterFuncType>::type getObjDeleter(DataType *inPtr) {
if (inPtr != nullptr) {
return inPtr->getCustomDeleter();
}
return nullptr;
}
template <typename DT = DataType>
static typename std::enable_if<!std::is_base_of<ReferenceTrackedObject<DataType>, DT>::value, DeleterFuncType>::type getObjDeleter(DataType *inPtr) {
return nullptr;
}
static void doDelete(DataType *ptr) {
delete ptr;
}
static void dontDelete(DataType *ptr) {
;
}
};
// This class is needed for having both internal and external (api)
// reference counters
// Note : we need both counters because an OCL app can release an OCL object
// while this object is still needed/valid (e.g. events with callbacks),
// so we need to have a way of tracking internal usage of these object.
// At the same time, we can't use one refcount for both internal and external
// (retain/release api) usage because an OCL application can query object's
// refcount (this refcount should not be contaminated by our internal usage models)
// Note : internal refcount accumulates also api refcounts (i.e. incrementing/decrementing
// api refcount will increment/decrement internal refcount as well) - so, object
// deletion is based on single/atomic decision "if(--internalRefcount == 0)"
template <typename DerivedClass>
class ReferenceTrackedObject {
public:
virtual ~ReferenceTrackedObject();
int32_t getRefInternalCount() const {
return refInternal.peek();
}
void incRefInternal() {
refInternal.inc();
}
unique_ptr_if_unused<DerivedClass> decRefInternal() {
auto customDeleter = tryGetCustomDeleter();
auto current = refInternal.decAndReturnCurrent();
bool unused = (current == 0);
UNRECOVERABLE_IF(current < 0);
return unique_ptr_if_unused<DerivedClass>(static_cast<DerivedClass *>(this), unused, customDeleter);
}
int32_t getRefApiCount() const {
return refApi.peek();
}
void incRefApi() {
refApi.inc();
refInternal.inc();
}
unique_ptr_if_unused<DerivedClass> decRefApi() {
refApi.dec();
return decRefInternal();
}
using DeleterFuncType = void (*)(DerivedClass *);
DeleterFuncType getCustomDeleter() const {
return nullptr;
}
bool peekHasZeroRefcounts() const {
return refInternal.peekIsZero();
}
private:
DeleterFuncType tryGetCustomDeleter() const {
const DerivedClass *asDerivedObj = static_cast<const DerivedClass *>(this);
return asDerivedObj->getCustomDeleter();
}
RefCounter<> refInternal;
RefCounter<> refApi;
};
template <typename DerivedClass>
inline ReferenceTrackedObject<DerivedClass>::~ReferenceTrackedObject() {
DEBUG_BREAK_IF(refInternal.peek() > 1);
}
} // namespace NEO
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