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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespamalloc/malloc/common.h>
#include <algorithm>
namespace vespamalloc {
class AFListBase
{
public:
typedef Atomic::TaggedPtr HeadPtr;
AFListBase() : _next(NULL) { }
void setNext(AFListBase * csl) { _next = csl; }
static void init();
static void enableThreadSupport() { _link->enableThreadSupport(); }
static void linkInList(HeadPtr & head, AFListBase * list);
static void linkIn(HeadPtr & head, AFListBase * csl, AFListBase * tail) {
_link->linkIn(head, csl, tail);
}
protected:
AFListBase * getNext() { return _next; }
static AFListBase * linkOut(HeadPtr & head) { return _link->linkOut(head); }
private:
class LinkI
{
public:
virtual ~LinkI();
virtual void enableThreadSupport() { }
virtual void linkIn(HeadPtr & head, AFListBase * csl, AFListBase * tail) = 0;
virtual AFListBase * linkOut(HeadPtr & head) = 0;
};
class AtomicLink : public LinkI
{
private:
virtual void linkIn(HeadPtr & head, AFListBase * csl, AFListBase * tail);
virtual AFListBase * linkOut(HeadPtr & head);
};
class LockedLink : public LinkI
{
public:
virtual void enableThreadSupport() { _mutex.init(); }
private:
virtual void linkIn(HeadPtr & head, AFListBase * csl, AFListBase * tail);
virtual AFListBase * linkOut(HeadPtr & head);
Mutex _mutex;
};
static char _atomicLinkSpace[sizeof(AtomicLink)];
static char _lockedLinkSpace[sizeof(LockedLink)];
static LinkI *_link;
AFListBase *_next;
};
template <typename MemBlockPtrT>
class AFList : public AFListBase
{
public:
typedef size_t CountT;
enum { NumBlocks = 126 };
AFList() : _count(0) { }
CountT count() const { return _count; }
void add(MemBlockPtrT & ptr) {
ptr.free();
PARANOID_CHECK2( if (full()) { *(int*)0=0; });
_memBlockList[_count++] = ptr;
}
void sub(MemBlockPtrT & mem) {
if (empty()) {
return;
}
mem = _memBlockList[--_count];
}
bool empty() const { return (_count == 0); }
bool full() const { return (_count == NumBlocks); }
size_t fill(void * mem, SizeClassT sc, size_t blocksPerChunk = NumBlocks);
AFList * getNext() { return static_cast<AFList *>(AFListBase::getNext()); }
static AFList * linkOut(HeadPtr & head) {
return static_cast<AFList *>(AFListBase::linkOut(head));
}
private:
CountT _count;
MemBlockPtrT _memBlockList[NumBlocks];
};
template <typename MemBlockPtrT>
size_t AFList<MemBlockPtrT>::fill(void * mem, SizeClassT sc, size_t blocksPerChunk)
{
size_t sz = MemBlockPtrT::classSize(sc);
int retval(std::max(0, int(blocksPerChunk-_count)));
char * first = (char *) mem;
for(int i=0; i < retval; i++) {
_memBlockList[_count] = MemBlockPtrT(first + i*sz, MemBlockPtrT::unAdjustSize(sz));
_memBlockList[_count].free();
_count++;
}
return retval;
}
}
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