deadlock

问题 I have multiple threads that start jobs using a synchronous job launcher. I get the following exception when job instances are created concurrently: Exception in thread "pool-1-thread-1" org.springframework.dao.DataAccessResourceFailureException: Could not obtain last_insert_id(); nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction at org.springframework.jdbc.support.incrementer

问题 i have two programs working on the same file i want the first program to check regularly on the file, and if any changes are made operate on the file and empty it. the other program writes to the file. the problem occurs when the second program tries to write on the file because it's used from the first one is there an (if there's any implemented C# program would be even better) algorithm to handle this? 回答1: To check if file has changed you might first of all check its timestamp. In pseudo

问题 I have a window on thread A, which at some point (as a result of a message being received on its wndproc) triggers an action on thread B, and then waits for the action to complete (using some sort of sync mechanism). Thread B then calls MoveWindow() , to move a child window within thread A's window (a standard textbox, for example). At this point the program goes into a state of deadlock for some reason. If MoveWindow() is being called from thread A, everything works. Any ideas why? 回答1: What

问题 I try to write a program like a compiler. In this case I must simulate these codes of SQLPL (this one can be just for example). For example in command prompt I want to do these: c:\> sqlplus .... Enter User-Name:(here we must enter username) xxxx Enter password:(same up)yyyyy ... sql>(now I want to send my sql command to shell)prompt "rima"; "rima" [<-output] sql> prompt "xxxx" sql> exit very simple. I try to use this code: ProcessStartInfo psi = new ProcessStartInfo( @"sqlplus"); psi

问题 There is a program (which I cannot modify) that creates two output files. I am trying to write a Python wrapper that invokes this program, reads both output streams simultaneously, combines the output, and prints to stdout (to facilitate streaming). How can I do this without deadlocking? The following proof of concept below works fine, but when I apply this approach to the actual program it deadlocks. Proof of concept : this is a dummy program, bogus.py , that creates two output files like

问题 I'm having trouble within a block of code that I believe is related to a mouse click event but I cannot seem to capture the exact event within my code. I've used the C# debugger to step through my code and after the end of one of my events the code simply locks up. The purpose of my post is to ask if there is any software that will watch my process and let me know the events that are firing off after I hit the F11 key and the code freezes up. I've tried SysInternals' procmon.exe but that isn

问题 I have two concurrent transactions executing this bit of code (simplified for illustration purposes): @Transactional public void deleteAccounts() { List<User> users = em.createQuery("select u from User", User.class) .setLockMode(LockModeType.PESSIMISTIC_WRITE) .getResultList(); for (User user : users) { em.remove(user); } } My understanding is that one of the transactions, say transaction A, should execute the SELECT first, lock all the rows it needs and then go on with the DELETEs while the

问题 I'm working on Postgres 9.2. There are 2 UPDATEs, each in their own transactions. One looks like: UPDATE foo SET a=1 WHERE b IN (1,2,3,4); The other is similar: UPDATE foo SET a=2 WHERE b IN (1,2,3,4); These could possibly run at the same time and in reality have 500+ in the 'IN' expression. I'm sometimes seeing deadlocks. Is is true that that order of items in the 'IN' expression may not actually influence the true lock ordering? 回答1: Yes. I think the main issue here is that IN checks for

问题 I'm using a common base class has_threads to manage any type that should be allowed to instantiate a boost::thread . Instances of has_threads each own a set of thread s (to support waitAll and interruptAll functions, which I do not include below), and should automatically invoke removeThread when a thread terminates to maintain this set 's integrity. In my program, I have just one of these. Threads are created on an interval every 10s, and each performs a database lookup. When the lookup is

问题 I have the following Java Program which one starts in about 50% of all launch attempts. The rest of the time it seams to deadlock in the background without displaying any GUI. I traced the problem to the setText method of the JTextArea Object. Using another Class like JButton works with setText but JTextArea deadlocks. Can anyone explain to me why this is happening and what is wrong with the following code: public class TestDeadlock extends JPanel { private JTextArea text; TestDeadlock(){