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View Code? Open in Web Editor NEWA light-weight C++ toolkit for building concurrent, lock-free, message-passing programs.
License: MIT License
A light-weight C++ toolkit for building concurrent, lock-free, message-passing programs.
License: MIT License
QwSpscUnorderedResultQueue::push()
currently uses the following algorithm:
void push(Node *node)
{
Node *top = atomicLifoTop_.load(std::memory_order_relaxed); // (*)
node->next = top;
atomicLifoTop_.store(node, std::memory_order_release);
}
The bug is that somewhere after (*)
and prior to atomicLifoTop_.store()
, the pop()
function may execute:
node_ptr_type result = atomicLifoTop_.exchange(0, std::memory_order_acquire);
This would leave atomicLifoTop_->next
pointing to a node that is no longer on the stack.
The fix is to use compare_exchange
instead of store
, to handle the above condition as a special case. (This fix will work because QwSpscUnorderedResultQueue is single-producer single-consumer, so it is not possible for other threads to interfere.)
void push(Node *node)
{
Node *top = atomicLifoTop_.load(std::memory_order_relaxed);
node->next = top;
if (atomicLifoTop_.compare_exchange_strong(top, node,
/*success:*/ std::memory_order_release,
/*failure:*/ std::memory_order_release) == false) {
assert(top == 0);
node->next = 0;
atomicLifoTop_.store(node, std::memory_order_relaxed);
}
}
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