deadlock

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 synchronized actions throwing Exception } //implicitly calls finally{lock.unlock();} So it would not be a

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 its critical region and an up just after leaving it, mutual exclusion is guaranteed. I understand there

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 status while uploading data. Anyone have any good idea how to resolve this problem ? As it says: you take

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 It is possible but it might not be the best thing to do. Unit tests aren't really suitable for testing concurrency behaviour, unfortunately there aren't many test-methods that are

During the ASP.NET execution of my app, it seems SQL 2008 Express holds some lock, and I get Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding Maybe some of my query is not optimized. Visual Studio crashes with: Microsoft Visual Studio may be unstable now. It is recommended that you save all files and exit. I need to see what query is blocking my tables, but I have the Express version. How can I do? Thanks You can query against the sys.dm_tran_locks dynamic view to obtain this information. Go here on MSDN to lean more. exec sp_lock

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(TransactionScopeOption.RequiresNew, New TransactionOptions() With {.IsolationLevel = IsolationLevel

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 would like to know are there any way to dump the call stack of python code after I paused the program?

The Sql Server 2008 R2 instance in question is a heavy load OLTP production server. The deadlock issue came up a few days back and is still unresolved. We received the Xml deadlock report that listed the stored procedures involved in the deadlock and some other details. I'll try to list down the facts from this xml first: Two stored procedures are involved in the deadlock, say SP1 and SP2. According to the report SP1 was running in Isolation level "Serializable" and SP2 was running in "ReadCommitted" . We have investigated the following: Are we setting IsolationLevel of SP1 to "Serializable"

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 a separate critical section in my host. This means that Python will hold the GIL (potentially from