deadlock

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.lang.Thread)0x28 pool-3-thread-2 waiting in a monitor (java.lang.Thread)0x27 pool-3-thread-3 waiting

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 concurrent.futures.ThreadPoolExecutor . To find the location of the deadlock, I'm using the this receipe from ActiveState. Now, here's the full stacktrace: # ThreadID: 4856 File: "c:\users\niklas\appdata\local\programs\python\python36\lib\threading.py", line 884, in _bootstrap self._bootstrap_inner() File: "c:\users\niklas\appdata\local\programs\python\python36\lib\threading.py", line 916, in _bootstrap

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(); session.beginTransaction(); Matrixtr onematrixtr = new Matrixtr(); onematrixtr.setDimension

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 another transaction tried to acquire a lock on these, MySQL failed the transaction detecting a deadlock. Is my reading of this correct? If so, is there anything in MySQL 5.6 to get over this? FWIW, the same code in 5.5 worked just fine (for several hundreds of iterations). ------------------------ LATEST DETECTED DEADLOCK ------------------------ 2013-07-25 11:46:05 13a515000 *** (1) TRANSACTION:

We have a (currently InnoDB) table which contains roughly 500,000 rows. This represents a queue of tasks to run. It is stored in a MySQL database. An a continual basis, at least once per second but sometimes more frequently, we select data from it and subsequently update some rows. Once per day, we prune old rows from the table. We started getting deadlocks on the table and this brought our task processing to a standstill. These deadlocks were caused during the nightly prune run. The combination of DELETE, SELECT, and UPDATE meant that essentially nothing productive could happen. I

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 and getting enough data? Monitoring of SQL Azure is more limited than SQL Server, but the tools are

I am having an issue with some process wrapping, and it's only occurring in Windows XP. This code works perfectly in Windows 7. I'm really stumped as to why the streams are empty in XP. I've also tried using the String[] version of Process.Exec() and it made no difference. I am using the following class to read from the process' STDOUT and STDERR (an instance for each stream): import java.util.*; import java.io.*; public class ThreadedStreamReader extends Thread{ InputStream in; Queue messageQueue; public ThreadedStreamReader(InputStream s, Queue q) { in = s; messageQueue = q; } public void

I am using SQL Server 2008 Enterprise. I met with issue which says line 9 of stored procedure foo is meeting with dead lock issue. My question is how to find exactly the 9th line of the stored procedure? My confusion is because of coding format issue, how to locate 9th line correctly. thanks in advance, George It's the 9th line from the CREATE PROCEDURE statement. A SQL statement is often multiline so "line 9" will refer to the first line of the statement (eg INSERT or UPDATE) However, if you have comments above the CREATE PROCEDURE or blank lines before it then you can't rely on this... so