locking

问题 how to create password to windows folder using c# shall I set password to folders when it is created. 回答1: You can't set a password on a folder in either FAT32 or NTFS, however you can set up so that only certain user accounts can access it using the DirectorySecurity class. There's some sample code in that link. 回答2: Something like this cannot be done using C#. The only real reliable way of achieving something like this is to write a kernal-mode File System Filter Driver. If you install the

问题 I'm using OpenJPA and I have a lock problem. I already understand what's an OptimisticLockException and when it's thrown. But how can I deal with it ? Below*, you can find a small paragraph about the optimistic lock exceptions. In a nutshell, how I can totally disable the lock manager ? In my persistent.xml, I have the following xml code but it does not work. Why ? ... <properties> <property name="openjpa.LockManager" value="none" /> </properties> ... *According to the wikibooks about the

问题 I've added code to a Python package (brian2) that places an exclusive lock on a file to prevent a race condition. However, because this code includes calls to fcntl , it does not work on Windows. Is there a way for me to place exclusive locks on files in Windows without installing a new package, like pywin32 ? (I don't want to add a dependency to brian2 .) 回答1: Since msvcrt is part of the standard library, I assume you have it. The msvcrt (MicroSoft Visual C Run Time) module only implements a

问题 I've added code to a Python package (brian2) that places an exclusive lock on a file to prevent a race condition. However, because this code includes calls to fcntl , it does not work on Windows. Is there a way for me to place exclusive locks on files in Windows without installing a new package, like pywin32 ? (I don't want to add a dependency to brian2 .) 回答1: Since msvcrt is part of the standard library, I assume you have it. The msvcrt (MicroSoft Visual C Run Time) module only implements a

问题 I'm using Neo4j graph DB and viewing the data on the browser. So whenever I run a code, i need to change database location field in neo4j-server.properties file. When i try to access DB with browser on I'm getting the following error: Exception in thread "main" java.lang.IllegalStateException: Unable to lock store [<DB path>], this is usually a result of some other Neo4j kernel running using the same store. Is it possible to view the database without locking the store? 回答1: There is another

问题 Does the c# lock keyword use a 'yielding', 'spin-locking' or hybrid approach to handle contention? So far my searches on the .net lock statement hasn't turned up an answer. I will post if I do find any more. So far all I could find is When should one use a spinlock ... with a nicely worded accepted answer by Mecki. But I am looking for some definitive answer or documentation regarding .net/c# if anyone has one. 回答1: Following code: lock (_syncRoot) { // Do stuff } Is translated by the

问题 Does the c# lock keyword use a 'yielding', 'spin-locking' or hybrid approach to handle contention? So far my searches on the .net lock statement hasn't turned up an answer. I will post if I do find any more. So far all I could find is When should one use a spinlock ... with a nicely worded accepted answer by Mecki. But I am looking for some definitive answer or documentation regarding .net/c# if anyone has one. 回答1: Following code: lock (_syncRoot) { // Do stuff } Is translated by the

问题 Does the c# lock keyword use a 'yielding', 'spin-locking' or hybrid approach to handle contention? So far my searches on the .net lock statement hasn't turned up an answer. I will post if I do find any more. So far all I could find is When should one use a spinlock ... with a nicely worded accepted answer by Mecki. But I am looking for some definitive answer or documentation regarding .net/c# if anyone has one. 回答1: Following code: lock (_syncRoot) { // Do stuff } Is translated by the

问题 Does the c# lock keyword use a 'yielding', 'spin-locking' or hybrid approach to handle contention? So far my searches on the .net lock statement hasn't turned up an answer. I will post if I do find any more. So far all I could find is When should one use a spinlock ... with a nicely worded accepted answer by Mecki. But I am looking for some definitive answer or documentation regarding .net/c# if anyone has one. 回答1: Following code: lock (_syncRoot) { // Do stuff } Is translated by the

问题 Is there a way of fixing the size of a vector and still changing the contents? I have tried making a const vector const std::vector<int> vec(10); but that prevents me from changing the values. vec[3] = 3; gives a compiler error: assignment of read-only location. I have also tried with a const reference to a non-const vector std::vector<int> vec(10); const std::vector<int>& vecref(vec); which gives the same compiler error. I want to be able to fix the vector size either on declaration or after