locking

Please, can anybody explain how to use and create an unique_lock in c++? It should be used both to get mutual exclusion to any procedure of the monitor and to be able to perform wait() on the condition variable...I'm not understanding from the documentation how I am supposed to create it. Is necessary a mutex? Here is a pseudo-code: /* compile with g++, flags -std=c++0x -lpthread */ #include <condition_variable> #include <mutex> #include <thread> #include <iostream> #include <string.h> #include <unistd.h> class monitorTh { private: std::mutex m; std::condition_variable waitP; std::condition

I have a script that was generated in SQL Server 2008, but I need to execute it against a SQL Server 2005 database. What would an equivalent statement for the following be in SQL Server 2005? ALTER TABLE dbo.Event SET (LOCK_ESCALATION = TABLE) LOCK_ESCALATION = TABLE is the default behavior in SQL Server 2008 & is the ONLY behaviour in SQL Server 2005. You can safely drop the statement without any change in functionality. There is no equivalent option: it's new in SQL Server 2008 . You'll need to change the "Script For version" to SQL Server 2005, Michael Freidgeim @gbn wrote " You'll need to

I have a Lambda function that’s triggered by a PUT to an S3 bucket. I want to limit this Lambda function so that it’s only running one instance at a time – I don’t want two instances running concurrently. I’ve had a look through the Lambda configuration and docs, but I can’t see anything obvious. I can about writing my own locking system, but it would be nice if this was already a solved problem. How can I limit the number of concurrent invocations of a Lambda? AWS Lambda now supports concurrency limits on individual functions: https://aws.amazon.com/about-aws/whats-new/2017/11/set-concurrency

I'm wondering if this construction will cause an error: lock(sync) { // something lock(sync) { //something lock(sync) { //something } } } I've run this code, and it seems fine, but maybe in some circumstances an error may be thrown? lock is a wrapper for Monitor.Enter and Monitor.Exit : The lock keyword calls Enter at the start of the block and Exit at the end of the block. From the former's documentation: From the documentation for Monitor.Enter : It is legal for the same thread to invoke Enter more than once without it blocking; however, an equal number of Exit calls must be invoked before

I am working an app where lock option is included.My app starts with passcode screen.If I enter correct code then it navigates to next screen.If I dont use the app for long time it goes to sleep mode.When the user wants to run the app now, the passcode screen should appear and the user has to enter the code again.Is it possible?Is there any tutorial for this?Please dont mind to post the related code if you have done it.Thanks in advance. Kanan Vora Yes ofcourse it is possible. You must open the screen in a method called applicationDidBecomeActive in your Application Delegate. This method is

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Performing an ETL-task in pure Python, I would like to collect error metrics as well as metadata for each of the raw input files considered (error metrics are computed from error codes provided in the data section of the files while metadata is stored in headers). Here's pseudo-code for the whole procedure: import pandas as pd import dask from dask import delayed from dask import dataframe as dd META_DATA = {} # shared resource ERRORS = {} # shared resource def read_file(file_name): global META_DATA, ERRORS # step 1: process headers headers