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the E n q u e u e method calls Re s i z e while still holding m_e n q Lo c k That method then acquires m_deq Loc k and performs the resizing while holding both When it unlocks, the queue is back in a consistent state There is a small benign race here that could lead to resizing when not strictly necessary: after seeing that the queue was full, any number of threads could dequeue elements before the enqueuer gets around to actu ally calling R e s i z e In such a case, the array would grow although there is technically now space available To avoid this, we could recheck the full condition again after acquiring m_deq Loc k But this is a minor optimization and adds complexity to the code base, so its value is questionable This was brought up because it's an interesting example of the kinds of tradeoffs you will encounter in the real world, particularly for low-level data structures
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Linked Lists We've already seen a linked list used in a context with fine-grained locking But what if we want to provide access to arbitrary elements within such a list This could be useful for adding and removing elements at particular locations To do these kinds of things using fine-grained locks, we'll need to somehow lock individual nodes For simplicity's sake, our example linked list will be a singly linked list and has a very simplistic surface area Adds and removes from the head are allowed, and adds to the tail are allowed, all of which are 0(1 ) operations; inserts and removes are also permitted, typi cally requiring the use of O(N) find operations, as is standard with linked lists This can be used to create a simple dequeue, among other things Access to non-head and non-tail nodes works by searching for a partic ular value in the list We have three relevant methods: T ry l n s e rtAft e r , Tryl n s e rt Before, and TryRemove, all implemented using a standard T ry F i n dAndPe rform method that encapsulates the tricky race free traversal logic and invokes a delegate when the sought after value has been found (More useful interfaces are conceivable and necessary for more complicated use cases, such as maintaining a list in sorted order This could be accom modated with a variant of T ry F i n dA n d P e rform that used a predicate dele gate that found an arbitrary position in the list, but may also require exposing the internal list nodes publicly for efficiency reasons) In order to implement searching, we will use so-called hand over hand locking
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p u b l i c c l a s s F i neG r a i n e d L i n k ed L i s t < T > { c l a s s Node { i n t e r n a l T m_va l j i n t e r n a l Nod e m_next j
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p rivate Node m_h e a d j p rivate N o d e m_t a i l j p u b l i c F i n eG r a i ned L i n k ed L i st ( ) { m_h e a d m_t a i l
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new Node ( ) j
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p u b l i c void Ad dHead ( T obj ) { Node n = new Node ( ) j n m_va l = obj j w h i l e ( t ru e ) { Node h = m_head j lock ( h ) { if ( m_head ! = h ) cont i n u e j n m_next h m_next brea k j
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} p u b l i c T RemoveHead ( ) { T va l j wh i l e ( t r u e ) { Node h = m_head j loc k ( h ) { if ( m_head ! = h ) cont i n u e j if ( h m_next = = n u l l ) t h row n ew E x c eption ( n empty n ) j
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