deadlock

问题 Is there way to tell Pervasive PSQL to ignore locked records during an standard SQL Update Statement? I have an update statement that needs to run daily on a Pervasive PSQL 11 SP3 database (that updates thousands of records). This update statement is sent via odbc. After each (of multiple) tries, the update fails after about 5 mintues with: S1000 General Error I suspected that maybe some of "the record to be updated" were locked. So I rebooted the server and ran the update statement again.

问题 I have the following construct: A base-class which does some loading tasks asynchronously and a inherited class which only converts the result of the base-class into a special data-type (it's just a generic version with some extensions, but those are not of importance). I initially call the inherited class' Process-method: public TOut Process(object parameters) { return (TOut) StartProcessor(parameters).Result; } This method calls the following method of the base: protected async Task<object>

问题 The following is my code that opens a transaction and inserts a row to the table, meanwhile I open another connection and query the same table. The program hangs up at Line (*). //TestTable is empty. using (connection1 == new SqlConnection(OpConsoleLib.std.CONNECTIONSTRING)) { connection1.Open(); SqlCommand cmd = new SqlCommand("Insert into TestTable values('hello')", connection1); cmd.Transaction = connection1.BeginTransaction(); cmd.ExecuteNonQuery() using (SqlConnection connection2 = new

问题 It is a homework assignment. I have two files which were already given. The Client class and the SharedValues Interface . Here is the description: I need to write a class (resource handler) which contains static interfaces and manage "n" number of resource allocation and its scheduling for "k" number of clients. there must be only two operations for the clients. Reading and writing with no deadlock and no starvation . If one resource is allocated for writing then other clients can't have it

问题 I got information from SHOW ENGINE INNODB STATUS *** (1) TRANSACTION: TRANSACTION 0 2799914, ACTIVE 1 sec, process no 4106, OS thread id 139808903796480 inserting mysql tables in use 1, locked 1 LOCK WAIT 10 lock struct(s), heap size 1216, 7 row lock(s), undo log entries 3 MySQL thread id 4284, query id 2889649 localhost 127.0.0.1 test update INSERT INTO shipping ..... *** (1) WAITING FOR THIS LOCK TO BE GRANTED: RECORD LOCKS space id 0 page no 436366 n bits 88 index `PRIMARY` of table

问题 I mitigate the low success rate of a particular operation by running multiple threads and waiting for the first one to return with a valid answer. I've created a minimal example below: THREADS = [] if !defined?(THREADS) def threadtest THREADS.clear queue, mutex, result = Queue.new, Mutex.new, nil 10.times do |i| THREADS << Thread.new do counted = (10e6 + rand(10e6)).to_i.times { } # randomize computation time num = rand(8) # succeed only 1/8 of the time #mutex.synchronize do # even if wrapped

问题 I'm in the process of learning a more complex SQL Server 2008 techniques so I apologize in advance if I ask a too obvious question. I have the following table created as such: CREATE TABLE [dbo].[t_Log_2] ( [id] INT NOT NULL IDENTITY(1,1) PRIMARY KEY, [oid] INT, [idtm] DATETIME2, [odtm] DATETIME2, [type] TINYINT, [state] TINYINT, [huid] UNIQUEIDENTIFIER, [cnm] NVARCHAR(256), [cmdl] NVARCHAR(256), [batt] TINYINT, [dvtp0] SMALLINT, [dvtp1] SMALLINT ); CREATE INDEX idx_idt ON [dbo].[t_Log_2](

问题 I have one channel and the receiver is main. I spawn multiple goroutines that each send a string over the channel. Now, this causes a deadlock because I didn't close the channel properly using the close function. The thing is, I have no idea how many goroutines will be created, so there's no way to know when to close the channel. I've tried using WaitGroup, the problem is, I've read that I can't use Add in the goroutine and that I should use wg.Add(1) in the main process/goroutine, I've tried

问题 I am using a robust mutex together with a condition. This works most of the time, but infrequently, I get deadlocks. I could not reduce this to a small, reproducible example, and I consider it very likely that it is a problem in my code, however, I noticed something that looks suspicious: When the code deadlocks, one thread is in pthread_cond_broadcast: #0 __lll_lock_wait () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:135 #1 0x00007f4ab2892970 in pthread_cond_broadcast@@GLIBC_2.3.2 ()

问题 I've been bashing my head against this for a few days now and cannot for the life of me figure out what is going on. I'm pretty green with Core Data, but I know it well enough to avoid deadlock scenarios. However for this project I decided to try and incorporate AFIncrementalStore. I built a sample project to test the APIClient in order to map keys/values appropriately without messing with my actual project. It worked flawlessly. Now I'm using it in my actual project and things are finicky.