deadlock

问题 i am going through oracle docs for deadlock.. i found this code public class Deadlock { static class Friend { private final String name; public Friend(String name) { this.name = name; } public String getName() { return this.name; } public synchronized void bow(Friend bower) { System.out.format("%s: %s" + " has bowed to me!%n", this.name, bower.getName()); bower.bowBack(this); } public synchronized void bowBack(Friend bower) { System.out.format("%s: %s" + " has bowed back to me!%n", this.name,

问题 When Oracle detects a deadlock, a trace file like this is written: *** SESSION ID:(56.27081) 2012-05-14 08:16:28.013 DEADLOCK DETECTED ( ORA-00060 ) [Transaction Deadlock] The following deadlock is not an ORACLE error. It is a deadlock due to user error in the design of an application or from issuing incorrect ad-hoc SQL. The following information may aid in determining the deadlock: Deadlock graph: ---------Blocker(s)-------- ---------Waiter(s)--------- Resource Name process session holds

问题 Can anybody give a simple Deadlock sample code in c# ? And please tell the simplest way to find deadlock in your C# code sample. (May be the tool which will detect the dead lock in the given sample code.) NOTE: I have VS 2008 回答1: one common way is if you have nested locks that aren't acquired in the same order. Thread 1 could acquire lock A and thread 2 could acquire lock B and they would deadlock. var a = new object(); var b = new object(); lock(a) { lock(b) { } } // other thread lock (b) {

问题 Can anybody give a simple Deadlock sample code in c# ? And please tell the simplest way to find deadlock in your C# code sample. (May be the tool which will detect the dead lock in the given sample code.) NOTE: I have VS 2008 回答1: one common way is if you have nested locks that aren't acquired in the same order. Thread 1 could acquire lock A and thread 2 could acquire lock B and they would deadlock. var a = new object(); var b = new object(); lock(a) { lock(b) { } } // other thread lock (b) {

问题 I am struggling to explain "deadlock" in threads in easy words, so please help. What could be the best example of "deadlock" (say, in Java), and how it does happen in steps and how to prevent it? But without getting into details too deep. I know that's like asking two opposite things, but still. If you have any previous concurrent programming training experience -- it would be superb! 回答1: Jack and Jill happens to want to make a sandwich at the same time. Both need a slice of bread, so they

问题 I received the following deadlock log via "SHOW INNODB STATUS". Can someone care to explain why the transaction was aborted? It seems that Transaction 2 is holding the lock, but is also stuck requesting the same lock (except for the "waiting" part), which leads to a deadlock when Transaction 1 requires it as well. ===================================== 091205 6:25:01 INNODB MONITOR OUTPUT ===================================== Per second averages calculated from the last 39 seconds ----------

问题 I'm trying to provide communication between a C# app and a Java app on windows using named pipes with the method described by v01ver in this question: How to open a Windows named pipe from Java? I'm running into a problem on the Java side because I have a reader thread constantly waiting for input on the pipe and when I try to write to the pipe from my main thread it gets stuck forever. final RandomAccessFile pipe; try { pipe = new RandomAccessFile("\\\\.\\pipe\\mypipe", "rw"); } catch

问题 We have a single table which does not have references to any other tables. ┬────────────┬─────────────┬───────────────┬───────────────╮ │id_A(bigint)│id_B(bigint) │val_1(varchar) │val_2(varchar) │ ╪════════════╪═════════════╪═══════════════╪═══════════════╡ The primary key of the table is a composite of id_A and id_B. Reads and writes of this table are highly concurrent and the table has millions of rows. We have several stored procedures which do mass updates and deletes. Those stored

问题 I came across a deadlock scenario which can be summarized as the StaticDeadlock class shown below. This simple program will freeze at o.getClass() . Here's my speculation of what happened, but can someone explain it better? 1) the program enters StaticDeadlock static block 2) thread starts 3) main thread is put in wait for thread to finish, hence can't finish the static block 4) inside thread it access StaticDeadlock.o but StaticDeadlock's static block is not finished yet. Hence the program

问题 Is it technically possible for a thread in Java to deadlock itself? I was asked this at an interview a while back and responded that it wasn't possible but the interviewer told me that it is. Unfortunately I wasn't able to get his method on how to achieve this deadlock. This got me thinking and the only situation that I can think of is where you can have this happen is where you have an RMI server process which contained a method that calls itself. The line of code that calls the method is