deadlock

问题 We have problems with deadlock situations in our application. I have read a lot about blocking, locking and deadlocks the last few days to try to get an understanding about the problem in order to solve it. Now when I read the error log information about the deadlocks I can't understand how this situation can exist. Look at this (I have renamed the table names but the important one is the one called OurTable in the log message): deadlock-list deadlock victim=process1e2ac02c8 process-list

问题 I am sometimes receiving the following exception when attempting to deserialise an object using protobuf.net. I'm surprised as I never have more than a single thread deserialising the same object at the same time and the protobuf.net source does not seem to use any static objects for deserialising. The exception does suggest a solution but I am unsure as to how to implement so would welcome an example. Base Exception Type: System.TimeoutException: Timeout while inspecting metadata; this may

问题 I am using sonarqube 4.5.4 with mysql database. I got this exception when running analysis on my projects : INFO o.d.m.sonar.runner.RunSonarVisitor - ### Error updating database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction 2016-02-23 04:05:40.091Z INFO o.d.m.sonar.runner.RunSonarVisitor - ### The error may involve org.sonar.core.user.RoleMapper.insertGroupRole-Inline 2016-02-23 04:05:40.091Z INFO

问题 I am using sonarqube 4.5.4 with mysql database. I got this exception when running analysis on my projects : INFO o.d.m.sonar.runner.RunSonarVisitor - ### Error updating database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction 2016-02-23 04:05:40.091Z INFO o.d.m.sonar.runner.RunSonarVisitor - ### The error may involve org.sonar.core.user.RoleMapper.insertGroupRole-Inline 2016-02-23 04:05:40.091Z INFO

问题 Immagine that I have Class First with several synchronised methods. When a thread locks the class First , does it lock per method or per class? For example does deadlock happen for the following code? public class DeadLockQuestion { public static class First{ public synchronized void a(){ } public synchronized void b(){ } public synchronized void c(){ } public synchronized void d(){ } public synchronized void e(){ } } public static void main(String... args){ First f = new First(); //This code

问题 I'm trying to create a class that has synchronous methods and calls some other library methods which are asynchronous. For that reason I use Task.Result to wait for the async operation to finish. My methods are called by WPF app in synchronous way. This leads to a deadlock. I know that the best way is to make all my methods asynchronous but my situation requires them to be synchronous. From the other hand they use other library which is asynchronous. My question is: How can I avoid the

问题 I'm trying to print numbers 1-20 with two threads: Even thread - Print only even numbers. Odd thread - print only odd numbers. I also have a lock object for synchronization. My application is stuck. Can you tell me what is the problem? My code: public class runIt { public static void main(String[] args) { Odd odd = new Odd("odd thread"); Even even = new Even("even thread"); odd._t.start(); even._t.start(); try{ odd._t.join(); even._t.join(); } catch (InterruptedException e){ System.out

问题 I have a table in SQL Server that looks something like: Col1 Id -Int and Key Col2 ProductId int Col3 ProductDesc Varchar Within my Silverlight app, I have two grids showing data from this table - seperated out by the ProductId - In other words, I have all the product A's in one grid and all the Product B's in the other grid. When I select any item in either gird, I write it out to the table. If I deselect an item from the gird, I delete the row from the talble. Because of Silverlight's use of

问题 I'm trying to use autofac DI in my application. I created a wrapper class to abstract away all the autofac dlls: FrameworkDependencyResolver : Logger, IFrameworkDependencyResolver In this class I hold the container builder, and register all my dependencies in the application root. After registering my types I build it and hold the container: Icontainer _container; ContainerBuilder _builder public FrameworkDependencyResolver() { _builder = new ContainerBuilder(); } Deep in my application i

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