deadlock

问题 I got simple program as below: import threading import time import signal WITH_DEADLOCK = 0 lock = threading.Lock() def interruptHandler(signo, frame): print str(frame), 'received', signo lock.acquire() try: time.sleep(3) finally: if WITH_DEADLOCK: print str(frame), 'release' lock.release() signal.signal(signal.SIGINT, interruptHandler) for x in xrange(60): print time.strftime("%H:%M:%S"), 'main thread is working' time.sleep(1) So, if you start that program and even Ctrl+C is pressed twice

问题 Am I right in saying that a deadlock is supposed to happen in the following case: Object P calls a synch method of object A , that calls a synch method of object B , that calls a synch method of object A . Sorry if it looks stupid of me, most probably it is. But that's why I'm asking. Thanks! 回答1: By the information you give - no, a deadlock can't occur: First, you don't mention multiple threads. A single thread can't cause a deadlock. But let's assume you have multiple threads. So, if any

问题 It's been several days that I got deadlock issues on a Java application with Glassfish - EJB3 with Mysql InnoDB Config: Mysql InnoDB: Ver 14.12 Distrib 5.0.51a, for debian-linux-gnu (i486) using readline 5.2 Application server: Glassfish v2.1 Persistence with EJB3 - JPA - Hibernate To make it simple I have - a SOA system with servlet that handle subscriptions of users to services, logon, logoff, payments and registration etc... - a quartz job system (cron triggers) that handle the daily

问题 I'm getting a deadlock in my C++ program, which used std::thread, std::mutex, std::condition_variable, etc. There's nothing in itself strange about that, until I look at the stacks for each of the threads in my process: 8532 0 Main Thread Main Thread msvcr120.dll!Concurrency::details::ExternalContextBase::Block Normal ntdll.dll!_ZwWaitForSingleObject@12() KernelBase.dll!_WaitForSingleObjectEx@12() kernel32.dll!_WaitForSingleObjectExImplementation@12() msvcr120.dll!Concurrency::details:

问题 I have a java process loading a lot of data from a bunch of .csv files into a Neo4j database using the BatchInserter . I was using: OpenJDK 7 Ubuntu 12.04 Neo4j 2.0 M3 After loading the first 164 GB (according to ls -lh ) the folder size stopped increasing but the process kept running, no memory was released, and CPU was still at 100% (all according to htop ). The loading process is single threaded, only the JVM is using more than 1 thread - I guess by the ParallelGC . I'm not sure how to

问题 We have a WCF service that reads and writes documents on a network file storage (shared folder). Occasionally we see a situation where threads start to get stuck in the Win32Native code. Once a thread gets blocked, all the consequent calls are blocked as well. The interesting thing is that the issue does not go away after the windows service is restarted. Very first thread that tries to work with the document storage blocks and the issue repeats. Only after the server is rebooted, the service

问题 Ok, since there are currently no answer's I don't feel too bad doing this. While I'm still interested in what is actually happening behind the scenes to cause this problem, my most urgent questions are those specified in update 2. Those being, What are the differences between a JoinableQueue and a Manager().Queue() (and when should you use one over the other?). And importantly, is it safe to replace one for the other, in this example? In the following code, I have a simple process pool. Each

问题 I user sun jdk 1.5 ThreadPoolExecutor( 24, 24,60,TimeUnit.SECONDS, new LinkedBlockingQueue()). soemtime I use jdb tool to find the status of all threads in thread pool are " waiting in a monitor", the code is : String key = getKey(dt.getPrefix(), id); synchronized (key.intern()) { -----> Is there a problem in "synchronized (key.intern()) " ? I get following informatnio using jdb tool, the status of 24 threads is "waiting in a monitor", it means 24 threads are deadlock at "key.intern()". (java

问题 I have a very simple computation which produces letter matrices finds probably all the words in the matrix. The letters in the word are adjacent cells. for (int i = 0; i < 500; i++) { System.out.println(i); Matrix matrix = new Matrix(4); matrix.scanWordsRandomly(9); matrix.printMatrix(); System.out.println(matrix.getSollSize()); matrix.write_to_db(); } Here is the persisting code. public void write_to_db() { Session session = null; try { session = HibernateUtil.getSessionFactory().openSession

问题 I have a Windows Azure role that consists of two instances. Once in a while a transaction will fail with an SqlException with the following text Transaction (Process ID N) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction. Now I've Googled for a while and read this post about identifying deadlocks using SQL Server logs. The problem is... How do I do it in SQL Azure? What tools do I use to access the internals of SQL Azure