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Optimize deque.

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This commit is contained in:
Bartosz Taudul 2017-11-15 20:20:02 +01:00
parent 1a99a57525
commit 5da8a7aa9b
1 changed files with 6 additions and 38 deletions
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44
client/concurrentqueue.h
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@ -2290,44 +2290,12 @@ private:
auto endIndex = (index & ~static_cast<index_t>(BLOCK_SIZE - 1)) + static_cast<index_t>(BLOCK_SIZE);
endIndex = details::circular_less_than<index_t>(firstIndex + static_cast<index_t>(actualCount), endIndex) ? firstIndex + static_cast<index_t>(actualCount) : endIndex;
auto block = localBlockIndex->entries[indexIndex].block;
if (MOODYCAMEL_NOEXCEPT_ASSIGN(T, T&&, details::deref_noexcept(itemFirst) = std::move((*(*block)[index])))) {
while (index != endIndex) {
auto& el = *((*block)[index]);
*itemFirst++ = std::move(el);
el.~T();
++index;
}
}
else {
MOODYCAMEL_TRY {
while (index != endIndex) {
auto& el = *((*block)[index]);
*itemFirst = std::move(el);
++itemFirst;
el.~T();
++index;
}
}
MOODYCAMEL_CATCH (...) {
// It's too late to revert the dequeue, but we can make sure that all
// the dequeued objects are properly destroyed and the block index
// (and empty count) are properly updated before we propagate the exception
do {
block = localBlockIndex->entries[indexIndex].block;
while (index != endIndex) {
(*block)[index++]->~T();
}
block->ConcurrentQueue::Block::template set_many_empty<explicit_context>(firstIndexInBlock, static_cast<size_t>(endIndex - firstIndexInBlock));
indexIndex = (indexIndex + 1) & (localBlockIndex->size - 1);
firstIndexInBlock = index;
endIndex = (index & ~static_cast<index_t>(BLOCK_SIZE - 1)) + static_cast<index_t>(BLOCK_SIZE);
endIndex = details::circular_less_than<index_t>(firstIndex + static_cast<index_t>(actualCount), endIndex) ? firstIndex + static_cast<index_t>(actualCount) : endIndex;
} while (index != firstIndex + actualCount);
MOODYCAMEL_RETHROW;
}
}
const auto sz = endIndex - index;
memcpy( itemFirst, (*block)[index], sizeof( T ) * sz );
index += sz;
itemFirst += sz;
block->ConcurrentQueue::Block::template set_many_empty<explicit_context>(firstIndexInBlock, static_cast<size_t>(endIndex - firstIndexInBlock));
indexIndex = (indexIndex + 1) & (localBlockIndex->size - 1);
} while (index != firstIndex + actualCount);