Recent questions tagged locking

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locking - Why Do Locks Require Instances In C#?

What is the purpose of using an object instance for each lock object? Is the CLR storing an instance of an ... first served queue and so on? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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locking - How to implement cross process lock in android?

I'm writing a library project for multiple APPs to use. And for some reason, I must make a function ... implement cross-process lock? thanks~ See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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locking - Python: Lock directory

AFAIK this code can be used to lock a directory: class LockDirectory(object): def __init__(self, directory): assert ... , Mac or other unix. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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locking - Overhead of using locks instead of atomic intrinsics

Does anyone know of published benchmarks of the overhead of locking instead of relying on certainly atomic operations ... to find reliable data. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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locking - Python Conditional "With" Lock Design

I am trying to do some shared locking using with statements def someMethod(self, hasLock = False): with self. ... I just acquire/release myself? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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locking - How to implement cross process lock in android?

I'm writing a library project for multiple APPs to use. And for some reason, I must make a function ... implement cross-process lock? thanks~ See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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locking - How to deliberately lock a MySQL row such that even SELECT will return an error?

I'm trying to use MySQL row locking to basically emulate a MuteEx on a row. Lets say that my table has 2 ... accurate at the time of a SELECT. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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locking - python multiprocessing lock issue

I want to add a list of dicts together with python multiprocessing module. Here is a simplified version of my code: ... way to do such things? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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locking - MPI with C: Passive RMA synchronization

as I found no answer for my question so far and am on the edge of going crazy about the problem, I just ... RMA, I would be very grateful See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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locking - python multiprocessing lock issue

I want to add a list of dicts together with python multiprocessing module. Here is a simplified version of my code: ... way to do such things? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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304 views

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locking - MPI with C: Passive RMA synchronization

as I found no answer for my question so far and am on the edge of going crazy about the problem, I just ... RMA, I would be very grateful See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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locking - Linux Kernel Preemption during spin_lock and mutex_lock

When a process in the kernel space is holding a spin_lock, the process cannot be preempted due to any of the following ... as 1, 2 and 3. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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locking - In Java, what is the difference between a monitor and a lock

Using the synchronized keyword method, using the javap command to view the bytecode, it is found that monitor is ... the lock and the monitor? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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locking - Python: Lock a file

I have a Python app running on Linux. It is called every minute from cron. It checks a directory for ... rather than throwing an exception. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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locking - How do I lock read/write to MySQL tables so that I can select and then insert without other programs reading/writing to the database?

I am running many instances of a webcrawler in parallel. Each crawler selects a domain from a table, inserts that url and ... LIMIT 1 ), now() ) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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365 views

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locking - accept() with sockets shared between multiple processes (based on Apache preforking)

I'm working on some Python code modeled on Apache's MPM prefork server. I am more an applications programmer ... the Apache description at all. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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502 views

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locking - Select unlocked row in Postgresql

Is there a way to select rows in Postgresql that aren't locked? I have a multi-threaded app that will ... thread the the transactions overlap. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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locking - How to unlock environment in R?

Playing with Binding and Environment Adjustments in R , we have this 3 functions: lockEnvironment(env) locks env ... the function doesn't exist See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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513 views

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locking - PHP flock() alternative

PHP's documentation page for flock() indicates that it's not safe to use under IIS. If I can't rely on ... could safely achieve the same thing? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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locking - Lock Android Device to Run Only One App

I was wondering if anyone had a relatively simple solution for us. We created an app to be used by our clients ... apps. Thank you in advance! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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locking - Ignoring locked row in a MySQL query

I have one table that is read at the same time by different threads. Each thread must select 100 rows, execute ... a select statement in MySQL ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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locking - Avoiding concurrency problems with MAX+1 integer in SQL Server 2008... making own IDENTITY value

I need to increment an integer in a SQL Server 2008 column. Sounds like I should use an IDENTITY ... incrementing order numbers PER customer? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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locking - mysql insert race condition

How do you stop race conditions in MySQL? the problem at hand is caused by a simple algorithm: select a ... high-concurrency databases to me. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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477 views

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locking - Re-assign/override hotkey (Win + L) to lock windows

Is it possible to re-assign the Win+L hotkey to another executable/shortcut? Use-case - I would like to ... can be assigned to this executable. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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locking - Git 'fatal: Unable to write new index file'

I've seen many of the other threads about this and they don't help. I have a very simple repo - two ... the remote yet. Everything is local. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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locking - best way to obtain a lock in php

I'm trying to update a variable in APC, and will be many processes trying to do that. APC doesn't provide ... seems to be a blocking lock. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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483 views

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locking - Mandatory file lock on linux

On Linux I can dd a file on my hard drive and delete it in Nautilus while the dd is still going on. Can ... mandatory file lock to protect R/W? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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locking - Opposite of Object.freeze or Object.seal in JavaScript

What is the opposite of Object.freeze or Object.seal? Is there a function that has a name such as detach? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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