locking

So I have a class with a few methods which all use locking in order to prevent weird things happening when someone uses an instance of my class with multiple threads accessing it: public class SomeRandomClass { private object locker = new object(); public void MethodA() { lock (locker) { // Does something MethodB(); } } public void MethodB() { lock (locker) { // Does something else } } } As we can see, MethodB() is automatically accessed by MethodA() , but that won't work since MethodA() has currently locked the locker object. I want to make MethodB() accessible publicly, so you can call it

I am just now starting to dig into Teradata's locking features and Google is fairly convoluted with explanations on this. Hopefully, I can get a very simple and streamlined answer from SE. After encountering numerous issues with identity columns in Teradata, I've decided to create a mechanism that mimics Oracle's sequence. To do this, I am creating a table with two fields, one that holds a table name and the other that stores its last-used sequence. I am going to then create a stored procedure that takes a table name. Within the procedure, it will perform the following options: Select the last

We are currently using SVN in the checkout-modify-merge mechanism and instead I want to re-configure the SVN server so that we change this to lock-modify-unlock mechanism. We use Tortoise SVN client and I saw that it is possible to individually change the property of single files to enforce the "needs-lock" property but this is too laborious and instead I am looking at some way through which we can change something on the svn server side that causes all the files to apply the "needs-lock" property. Thanks for the help ! Albin Sunnanbo Read Automatically add svn:needs-lock Since you use

My code: System.Resources.ResourceManager resourceManager = GetResourceManager(); string str = resourceManager.GetString("delete", new CultureInfo(1033)); In current project compiled under .NET 2.0 everything works as excepted. Variable str contains resource string for LCID 1033 - Delete , this is ok. We are now upgrading to .NET 4.0, recompiled project under target framework .NET 4.0. Now compiled as .NET 4.0 assemblies, it throws exception System.ArgumentNullException with message Value cannot be null. .Stack trace: at System.Threading.Monitor.Enter(Object obj) at System.Resources

1: I was trying this and it was working fine: start transaction; select * from orders where id = 21548 LOCK IN SHARE MODE; update orders set amount = 1500 where id = 21548; commit; According to the definition of LOCK IN SHARE MODE , it locks the table with IS lock and lock the selected rows with S lock. When a row is locked with S lock.How can it be modified without releasing lock? It needs X lock to modify it.Right? Or is it valid only for different connection transaction? 2: //session1 start transaction; select * from orders where id = 21548 FOR UPDATE; Keep this session1 same and try this

Python's fcnt module provides a method called [flock][1] to proved file locking. It's description reads: Perform the lock operation op on file descriptor fd (file objects providing a fileno() method are accepted as well). See the Unix manual flock(2) for details. (On some systems, this function is emulated using fcntl().) Looking up the linux man page for flock, it only refers to cross process locking, for example: A call to flock() may block if an incompatible lock is held by another process. To make a non-blocking request, include LOCK_NB (by ORing) with any of the above operations. So my

When I run the following code in from Python's multiprocessing module page : from multiprocessing import Process, Lock def f(l, i): l.acquire() print 'hello world', i l.release() if __name__ == '__main__': lock = Lock() for num in range(10): Process(target=f, args=(lock, num)).start() Sometimes I get unordered output such as: hello world 0 hello world 1 hello world 2 hello world 4 hello world 3 hello world 6 hello world 5 hello world 7 hello world 8 hello world 9 Note that 4 is printed before 3 and 6 is printed before 5. Why? Because the whole point of multiprocessing is parallelism . Your