locking

问题 I'm looking for a solution that allows multiple threads to read the shared resource (concurrency permitted) but then locks these reading threads once a thread enters a mutating block, to achieve best of both world. I've looked up this reference but it seems the solution is to lock both reading and writing threads. class Foo { List<string> sharedResource; public void reading() // multiple reading threads allowed, concurrency ok, lock this only if a thread enters the mutating block below. { }

问题 I'm facing a deadlock, my code structure is similar to this: private delegate void UpdateControlDelegate(string value); public void UpdateControl(string value) { if (txtAddress.InvokeRequired) { txtAddress.Invoke(new UpdateControlDelegate(UpdateControl), value); } else { txtAddress.Text = value; // This is in GroupBox1 txtValue.Text = value; // This is in GroupBox2 } } class ThreadHandler { List<string> _list = new List<string>(); object _criticalSection = new object(); public ThreadHandler()

问题 According to the official docs from here: the lock compatibility matrix: X IX S IS X Conflict Conflict Conflict Conflict IX Conflict Compatible Conflict Compatible S Conflict Conflict Compatible Compatible IS Conflict Compatible Compatible Compatible The docs also say: Thus, intention locks do not block anything except full table requests (for example, LOCK TABLES ... WRITE). The main purpose of IX and IS locks is to show that someone is locking a row, or going to lock a row in the table. If

问题 I want to lock a partition, write a few files using TFileStream and then unlock it. I found how to lock and unlock but I don't know how to write. So far my code is: Const FSCTL_LOCK_VOLUME = $00090018; FSCTL_UNLOCK_VOLUME = $0009001C; var HLockedVol: THandle; implementation {$R *.dfm} function LockDrive(Drive: AnsiChar): Boolean; var OldMode: UINT; BytesReturned: Cardinal; begin Result := False; OldMode := SetErrorMode(SEM_FAILCRITICALERRORS); try HLockedVol := CreateFile(PChar(Format('\\.\%s

问题 We are currently using Hazelcast 3.1.5. I have a simple distributed locking mechanism that is supposed to provide thread safety across multiple JVM nodes. Code is pretty simple. private static HazelcastInstance hInst = getHazelcastInstance(); private IMap<String, Integer> mapOfLocks = null; ... ... mapOfLocks = hInst.getMap("mapOfLocks"); if (mapOfLocks.get(name) == null) { mapOfLocks.put(name,1); mapOfLocks.lock(name); } else { mapOfLocks.put(name,mapOfLocks.get(name)+1); } ... <STUFF

问题 I can't seem to solve this one, even with all the forum posts. I just need to lock an entire row of a table (Table1) if the word "Locked" appears in one of the columns. Sub Accounts_Row_Fixed() ' ' Accounts_Row_Fixed Macro ' Dim rng As Range Set rng = Sheet2.Range("Table1[Accounts Row Fixed]") ActiveSheet.Unprotect "JP" rng.Select ActiveCell.FormulaR1C1 = "=IF([@Claim]=""Settled"",""Locked"","""")" Dim cel As Range, drng As Range Set drng = Range("Table1[Accounts Row Fixed]") For Each cel In

问题 I can't seem to solve this one, even with all the forum posts. I just need to lock an entire row of a table (Table1) if the word "Locked" appears in one of the columns. Sub Accounts_Row_Fixed() ' ' Accounts_Row_Fixed Macro ' Dim rng As Range Set rng = Sheet2.Range("Table1[Accounts Row Fixed]") ActiveSheet.Unprotect "JP" rng.Select ActiveCell.FormulaR1C1 = "=IF([@Claim]=""Settled"",""Locked"","""")" Dim cel As Range, drng As Range Set drng = Range("Table1[Accounts Row Fixed]") For Each cel In

问题 I am using C# lock to block code execution. It is not working if we use dynamic string input in Lock. public class ParameterClass { public string A = string.Empty; public Int64 B = 0; } class Program { static void Main(string[] args) { ParameterClass parm = new ParameterClass { A = "Test", B = 1 }; Thread thread = new Thread(ThreadFun); thread.Start(parm); System.Threading.Thread.Sleep(2000); parm = new ParameterClass { A = "Test", B = 1 }; ThreadFun(parm); } public static void ThreadFun

问题 Need help to lock reading(select) row At second 1 : Terminal A START TRANSACTION; SELECT * FROM tbl_processor WHERE id=1 FOR UPDATE; /*Or using this statement : SELECT * FROM tbl_processor WHERE id=1 LOCK IN READ MODE; */ UPDATE tbl_processor SET content='Updated content'; #Original content was content='Original content' SELECT SLEEP(10); #Just to sleep for testing purpose COMMIT; At second 2 : Terminal B; SELECT * FROM tbl_processor WHERE id=1; #This will return result immediately with

问题 The method GetItemSearchResponse will be called by multiple console application. But I wanted to call this method one by one. So I applied mutex. So that this method will be locked for other threads. public class AWSItemSearchClient : IDisposable { // the name of the global mutex; private const string MutexName = "FAA9569-7DFE-4D6D-874D-19123FB16CBC-8739827-[SystemSpecicString]"; private Mutex _globalMutex; private bool _owned = false; //This method call should be synchronized public