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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "generationholder.h"
#include <cassert>
namespace vespalib {
GenerationHeldBase::~GenerationHeldBase() = default;
GenerationHolder::GenerationHolder()
: _hold1List(),
_hold2List(),
_heldBytes(0)
{ }
GenerationHolder::~GenerationHolder()
{
assert(_hold1List.empty());
assert(_hold2List.empty());
assert(getHeldBytes() == 0);
}
void
GenerationHolder::hold(GenerationHeldBase::UP data)
{
_hold1List.push_back(std::move(data));
_heldBytes.store(getHeldBytes() + _hold1List.back()->byte_size(), std::memory_order_relaxed);
}
void
GenerationHolder::transferHoldListsSlow(generation_t generation)
{
HoldList::iterator it(_hold1List.begin());
HoldList::iterator ite(_hold1List.end());
HoldList &hold2List = _hold2List;
for (; it != ite; ++it) {
assert((*it)->_generation == 0u);
(*it)->_generation = generation;
hold2List.push_back(std::move(*it));
}
_hold1List.clear();
}
void
GenerationHolder::trimHoldListsSlow(generation_t usedGen)
{
for (;;) {
if (_hold2List.empty())
break;
GenerationHeldBase &first = *_hold2List.front();
if (static_cast<sgeneration_t>(first._generation - usedGen) >= 0)
break;
_heldBytes.store(getHeldBytes() - first.byte_size(), std::memory_order_relaxed);
_hold2List.erase(_hold2List.begin());
}
}
void
GenerationHolder::clearHoldLists()
{
_hold1List.clear();
_hold2List.clear();
_heldBytes = 0;
}
}
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