I have a multithreaded application that tries to INSERT a record in a table in multiple batches. Each thread processing one batch. At times I get Deadlock error, following is the trace. The table ...

I have a simple table CREATE TABLE test ( col INT, data TEXT, KEY (col) ); and a simple transaction START TRANSACTION; SELECT * FROM test WHERE col = 4 FOR UPDATE; -- If no results, genera...

Our client side code detects deadlocks, waits for an interval, then retries the request up to 5 times. The retry logic detects the deadlocks based on the error number 1205. My goal is to test both...

When I run Program 1 with command go run main.go it terminates with error all goroutines are asleep - deadlock! while the Program 2 keep waiting and does not terminate. We are not calling che...

Probably between 25 and 50% of the times I build my solution, I see this: "The operation you requested is taking longer than expected to complete. This dialog will close when the action completes....

I stumbled upon a problem with Virtual threads and ConcurrentHashMap. As the code below demonstrates, if you enter a lock within the computeIfAbsent, the VT may not awake, ever. It really depends h...

I'm really uncertain about the requirements POSIX places on the safety of fork in the presence of threads and signals. fork is listed as one of the async-signal-safe functions, but if there is a po...

So as I understand it, SQL deadlocks happen when a SPID is busy processing another query and it can't be bothered to run another one because it's so busy right now. The SQL Server "randomly" picks ...

Note: This question concerns C++11. The answer to the same question in C++17 (or later revisions) may have changed. For details: std::lock_guard or std::scoped_lock? When we want to lock mult...

My program appears to run in a deadlock sometimes when I hit Ctrl+C. I'm trying to catch the keyboard interrupt and gracefully stop all running threads, but I'm not quite there yet. I'm using a co...

I have a C# application which is inserting data into SQL Server (2008) table using stored procedure. I am using multi-threading to do this. The stored procedure is being called from inside the thre...

For one of my requirement I have to create N number of worker go routines, which will be monitored by one monitoring routine. monitoring routine has to end when all worker routines completes. My co...

I have an error log which reports a deadlock: Transaction (Process ID 55) was deadlocked on lock | communication buffer resources with another process and has been chosen as the deadlock victim....

When writing multi-threaded applications, one of the most common problems experienced are deadlocks. My questions to the community are: What is a deadlock? How do you detect them? Do you hand...

I came across the following in an MSDN Article: clientoption1 and clientoption2. Set options on this client connection. This is a bitmask that includes information about options usually con...

In his book, C++ Concurrency in Action, A. Williams introduces the concept of a lock hierarchy as a deadlock-avoidance mechanism. Below, I report a stripped down version of a HierarchicalMutex impl...

I have a mobile application and server based on Symfony which gives API for the mobile app. I have a situation, where users can like Post. When users like Post I add an entry in ManyToMany table t...

I see an error message related to transaction isolation levels. There are two tables involved, first one is updated frequently with transaction isolation level set to SERIALIZABLE, the second one h...

I have usually heard that it is a good idea to unlock any locks before calling event listeners to avoid deadlock. However, since the lock {} block is reentrant by the same thread in C#, is it OK to...

How could something equivalent to lock in C# be implemented in JavaScript? So, to explain what I'm thinking a simple use case is: User clicks button B. B raises an onclick event. If B is in even...

I have an application connected to a SQL Server 2014 database that combines several rows into one. There are no other connections to this database while the application is running. First, select a...

What is the difference between wait-die and wound-wait algorithms? It seems that both of these deadlock prevention techniques are doing the same thing: A Rollback of older process. What is the diff...

Ok, I'm totally lost on deadlock issue. I just don't know how to solve this. I have these three tables (I have removed not important columns): CREATE TABLE [dbo].[ManageServicesRequest] ( [Referen...

Will code like these ever produce a deadlock using a DashMap in Rust? // snippet_1 let a = DashMap::new(); let b = DashMap::new(); // thread1 for v in a.iter(){ xxx } for v in b.iter(){ xxx } /...

I am seeing a deadlock with MySQL 5.6 because of what seems like trying to lock the same row/s twice. From the snippet below, rows where id = (11, 12, 13, 14, 15) already have a lock. And when ano...