deadlock

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . When the Java application is hanging, you don't even know the use case that is leading to this and want to investigate, I understand

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . When the Java application is hanging, you don't even know the use case that is leading to this and want to investigate, I understand

问题 What I know is: ReadLock and WriteLock affect each other somehow WriteLock is just like synchronized ReadLock seems cannot work alone 回答1: readLock.lock(); This means that if any other thread is writing (i.e. holds a write lock) then stop here until no other thread is writing. Once the lock is granted no other thread will be allowed to write (i.e. take a write lock) until the lock is released. writeLock.lock(); This means that if any other thread is reading or writing , stop here and wait

问题 What I know is: ReadLock and WriteLock affect each other somehow WriteLock is just like synchronized ReadLock seems cannot work alone 回答1: readLock.lock(); This means that if any other thread is writing (i.e. holds a write lock) then stop here until no other thread is writing. Once the lock is granted no other thread will be allowed to write (i.e. take a write lock) until the lock is released. writeLock.lock(); This means that if any other thread is reading or writing , stop here and wait

问题 How can I programmatically detect that a deadlock has occurred in a Java program? 回答1: You can do this programmatically using the ThreadMXBean that ships with the JDK: ThreadMXBean bean = ManagementFactory.getThreadMXBean(); long[] threadIds = bean.findDeadlockedThreads(); // Returns null if no threads are deadlocked. if (threadIds != null) { ThreadInfo[] infos = bean.getThreadInfo(threadIds); for (ThreadInfo info : infos) { StackTraceElement[] stack = info.getStackTrace(); // Log or store

问题 We're seeing some pernicious, but rare, deadlock conditions in the Stack Overflow SQL Server 2005 database. I attached the profiler, set up a trace profile using this excellent article on troubleshooting deadlocks, and captured a bunch of examples. The weird thing is that the deadlocking write is always the same : UPDATE [dbo].[Posts] SET [AnswerCount] = @p1, [LastActivityDate] = @p2, [LastActivityUserId] = @p3 WHERE [Id] = @p0 The other deadlocking statement varies, but it's usually some

问题 We're seeing some pernicious, but rare, deadlock conditions in the Stack Overflow SQL Server 2005 database. I attached the profiler, set up a trace profile using this excellent article on troubleshooting deadlocks, and captured a bunch of examples. The weird thing is that the deadlocking write is always the same : UPDATE [dbo].[Posts] SET [AnswerCount] = @p1, [LastActivityDate] = @p2, [LastActivityUserId] = @p3 WHERE [Id] = @p0 The other deadlocking statement varies, but it's usually some

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 4 years ago . I recently got this questions asked in an interview. I answered that deadlock occurs if the interleaving goes wrong, but the interviewer insisted that a program that will always go into deadlock regardless of interleaving can be written . Can we write such a program ? Can you

问题 I have a MySQL table with about 5,000,000 rows that are being constantly updated in small ways by parallel Perl processes connecting via DBI. The table has about 10 columns and several indexes. One fairly common operation gives rise to the following error sometimes: DBD::mysql::st execute failed: Deadlock found when trying to get lock; try restarting transaction at Db.pm line 276. The SQL statement that triggers the error is something like this: UPDATE file_table SET a_lock = 'process-1234'

问题 Is it real that the TerminateProcess function in Windows could hang because the threads inside the process were stuck in a deadlock? Example: Process A is running under Process B's control, now Process A gets into a deadlock and Process B detects this and decides to 'Kill' process A using TerminateProcess. Would it be successful in killing the hung Process A? 回答1: Yes, all kernel objects held by the process will be released, including locks. The main problem with TerminateProcess is that the