How to implement a lock?

Lock is a questionable idea in JS which is intended to be threadless and not needing concurrency protection. You’re looking to combine calls on deferred execution. The pattern I follow for this is the use of callbacks. Something like this: var functionLock = false; var functionCallbacks = []; var lockingFunction = function (callback) { if … Read more

SQL query to get the deadlocks in SQL SERVER 2008 [duplicate]

You can use a deadlock graph and gather the information you require from the log file. The only other way I could suggest is digging through the information by using EXEC SP_LOCK (Soon to be deprecated), EXEC SP_WHO2 or the sys.dm_tran_locks table. SELECT L.request_session_id AS SPID, DB_NAME(L.resource_database_id) AS DatabaseName, O.Name AS LockedObjectName, P.object_id AS LockedObjectId, … Read more

Zero SQL deadlock by design – any coding patterns?

Writing deadlock-proof code is really hard. Even when you access the tables in the same order you may still get deadlocks [1]. I wrote a post on my blog that elaborates through some approaches that will help you avoid and resolve deadlock situations. If you want to ensure two statements/transactions will never deadlock you may … Read more

all goroutines are asleep – deadlock

Your monitorWorker never dies. When all the workers finish, it continues to wait on cs. This deadlocks because nothing else will ever send on cs and therefore wg will never reach 0. A possible fix is to have the monitor close the channel when all workers finish. If the for loop is in main, it … Read more

Thread deadlock example in C# [closed]

static object object1 = new object(); static object object2 = new object(); public static void ObliviousFunction() { lock (object1) { Thread.Sleep(1000); // Wait for the blind to lead lock (object2) { } } } public static void BlindFunction() { lock (object2) { Thread.Sleep(1000); // Wait for oblivion lock (object1) { } } } static void … Read more