deadlock

Windows phone HttpClient PostAsync hang with no response

由 可紊 提交于 2019-12-07 10:06:02
问题 I am having problem in calling the HttpClient post method from WP application.The PostAsync always hangs and does not give any response.The same code works when i try it from WPF application. Here is what I am doing: Server Web API code public class GameController : ApiController { [HttpPost] public GameDto CreateGame(GameDto gameDto) { try { GameManager bl = new GameManager(); gameDto = bl.CreateGame(gameDto); return gameDto; } catch (Exception) { throw; } } } Client WP8 code calling from

Query is locking tables, can't kill that process

由 こ雲淡風輕ζ 提交于 2019-12-07 08:28:47
问题 I have a query locking tables in MySQL (using InnoDB): UPDATE table SET status = 2 WHERE status = 3 This query caused a deadlock on the table and can't bypass it. I tried to do: show processlist then kill the process id but i can't seems to kill it I tried: kill 9588 9588 is the process id. Then I do show processlist I still see the same query on the list. How can I force killing this process and then why would this query cause a dead lock? how can I fix it? 回答1: When you run a MySQL instance

IPhone SendDelegateMessage failed to return after waiting 10 Secs

由 China☆狼群 提交于 2019-12-07 07:33:52
问题 I keep getting the following message from my iPhone 3.0 when trying to convert a large NSData object into base64Encoding for http transmission : void SendDelegateMessage(NSInvocation*): delegate failed to return after waiting 10 seconds. main run loop mode: kCFRunLoopDefaultMode If you were not using the touch screen for this entire interval (which can prolong this wait), please file a bug. I am using synchronous request and touch screen will be frozen with only UIProgressView displaying

Why not using a try with lock in java?

由 心已入冬 提交于 2019-12-07 05:47:45
问题 I've read this topic, and this blog article about try with resources locks, as the question popped in my head. But actually, what I'd rather like would be a try with lock , I mean without lock instantiation. It would release us from the verbose lock.lock(); try { //Do some synchronized actions throwing Exception } finally { //unlock even if Exception is thrown lock.unlock(); } Would rather look like : ? implements Unlockable lock ; ... try(lock) //implicitly calls lock.lock() { //Do some

How to debug deadlock with python?

由 天大地大妈咪最大 提交于 2019-12-07 04:17:13
问题 I am developing a multi-threading application, which is deadlocking. I am using Visual C++ Express 2008 to trace the program. Once the deadlock occurs, I just pause the program and trace. I found that when deadlock occurs, there will be two threads called python from my C++ extension. All of them use Queue in python code, so I guess the deadlock might caused by Queue. But however, once the extension goes into python code, I can't see nothing but asm code and binary from the VC++ debugger. I

If mutual exclusion is guaranteed, say with semaphores, is a program deadlock-free?

由 蹲街弑〆低调 提交于 2019-12-07 04:11:11
问题 I define mutual exclusion and deadlock as below, respectively: The mutual exclusion condition exists if at every moment, each shared resource is either assigned to exactly one process, or available. A set of processes is deadlocked if each process in the set is waiting for an event that only another process in the set can cause. Say, binary semaphores are used, ensuring that only one of them can enter its critical region at the same time. Since each process does a down just before entering

Deadlock with entity framework & LINQ

由 江枫思渺然 提交于 2019-12-07 02:32:06
问题 I have a asp.net/mvc 3/entity framework 4.1 web application which access a class library to get look up table data. When I hit the website for the first time and try to load two different pages simultaneously the app pool hangs. No dead lock or any activity in the database. I used windbg/vs2010 debugger to look for thread locks. Two threads are locking at System.Component.TypeDescriptor . The execution gets stuck at lookuptable.ToList Code : Using transaction As New TransactionScope

Python embedding with threads — avoiding deadlocks?

由 ≯℡__Kan透↙ 提交于 2019-12-07 02:19:45
问题 Is there any way to embed python, allow callbacks from python to C++, allowing the Pythhon code to spawn threads, and avoiding deadlocks? The problem is this: To call into Python, I need to hold the GIL. Typically, I do this by getting the main thread state when I first create the interpreter, and then using PyEval_RestoreThread() to take the GIL and swap in the thread state before I call into Python. When called from Python, I may need to access some protected resources that are protected by

Testing for a deadlock with nUnit

由 送分小仙女□ 提交于 2019-12-07 02:04:04
问题 I'm new to unit testing and nUnit (2.48). I'd like to write a test method where the failure case is that it deadlocks. Is this possible? Obviously nUnit doesn't know by default how long the method should take to execute, so would I have to write code to do the work on a separate thread and then abort it and throw and exception if it took longer than some time I define? Is there a better way to do this? Thank you 回答1: It is possible but it might not be the best thing to do. Unit tests aren't

Why single SQL delete statement will cause deadlock?

由 妖精的绣舞 提交于 2019-12-06 16:32:53
I am using SQL Server 2008 Enterprise. I am wondering why even a single delete statement of this stored procedure will cause deadlock if executed by multiple threads at the same time? For the delete statement, Param1 is a column of table FooTable, Param1 is a foreign key of another table (refers to another primary key clustered index column of the other table). There is no index on Param1 itself for table FooTable. FooTable has another column which is used as clustered primary key, but not Param1 column. create PROCEDURE [dbo].[FooProc] ( @Param1 int ,@Param2 int ,@Param3 int ) AS DELETE
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