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I I C reate a q u e u e t o cont a i n t h re a d s wa i t i n g for loc k s : Qu e u e < Wa i t Pa i r > waitG r a p h new Queue<WaitPa i r > ( ) j
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I I Add the c u r rent t h read to t h e l i s t of t h re a d s a l ready s e e n WaitPa i r c u rrent new WaitPa i r ( Thread C u rrentThrea d , t a rget Loc k ) j
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waitGraph E n q u e u e ( c u r rent ) j while ( t r ue ) { Thread own e r j I I If t h e l o c k i s ava i l a b l e , t h e r e i s no c y c l e E x i t if ( ! loc kOwne r s TryGetVa l ue ( c u r rent Lo c k , out own e r ret u r n j I I If t h e owner i s i n o u r wait - gra p h , t h e re i s a c y c l e II The wait g r a p h s t a r t s at t h e owne r forea c h ( Wa i t Pa i r p a i r i n waitGra p h ) { if ( pa i r Owner { II Dea d l o c k found ! The wait g r a p h s t a r t s at t h e f i r s t I I o c c u r r e n c e of ' owner ' i n t h e ' wa i t G r a p h ' q u e u e We II c a n p r i nt d i agnost i c s , t h row an e x c e p t i o n , etc t h row new E x c eption ( ) j } } I I If t h e own e r i s n ' t , there i s no c y c l e Exit o b j e c t ownerWa iti ngOn j if ( ! wa i t i n g F o r s T ryGetVa l u e ( owne r , out owne rWa i t i ngOn ret u r n j II Ot herwi s e , add the ent ry to t h e g r a p h , a n d p roc eed c u rrent new WaitPa i r ( owne r , own e rWa i t i ngOn ) j
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s t r u c t WaitPa i r { i n t e r n a l Thread Own e r j i n t e r n a l o b j e c t Loc k j i n t e r n a l Wa itPa i r ( T h read own e r , o b j e c t s l oc k ) { Own e r own e r j Loc k s l oc k j
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We begin by creating a queue containing a single Wa i t Pa i r entry This first pair tracks the current thread whose attempted acquisition of t a rget Loc k is triggering detection to kick in (Alternative algorithms involve start ing with all threads that hold locks and attempting to find any cycle The one shown only finds cycles that are rooted with a specific acquire This is slightly more efficient) We then enter a wh i l e loop We omit a slight opti mization for code brevity: if t a rget Loc k has no owner, there is no need to allocate any lists The initial pair is stored inside a variable c u r rent, which will always hold the most recent pair in the wait graph Once inside the while loop, we first see whether the current pair's lock has an owner If the lock is not held by another thread, there is no cycle and we return out of the method Otherwise, we check whether the owner is inside the wait graph If we've seen the thread previously, we have found a cycle and, therefore, can report a deadlock What we do is very specific to the scenario: we may print some diagnostics and wait anyway, commu nicate the information through a debugger, throw an exception, and so on Next, if we have not found a cycle, we continue We check what lock the owner is waiting to acquire If the owner isn't waiting, it's making forward progress under the lock, and we can safely exit knowing there are no dead locks Otherwise, we produce a new pair, set it as the current, and add it to the wait graph We then go back around the loop and continue until we find a deadlock or are convinced there aren't any In effect, we're building a graph like the one shown in Figure 1 1 2 The boxes indicate threads and the circles indicate locks; a line from a box to a circle means the thread is waiting for that lock, and a line from a circle to a box means that lock is owned by that particular thread
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