locking

问题 My app is saving images into a folder. Simultaneously another piece of software watches over this folder and prints pasted images. Problem I've encountered is that printing app can send on printer half rendered image or doesn't react to saved images at all. I'm using javax.imageio.ImageIO.write(RenderedImage im, String formatName, File output) to save BufferedImage into png format. If locking required please provide a code example with explicit locks. If not explain why. I've tested on

问题 In Artifactory, when user login incorrect 5 times, it only lock 1 second, how can I increase this duration? Thanks. 回答1: You can make this user locked until the Admin release it. This can be done by going to the Artifactory UI --> Admin --> Security Configuration --> User Locking --> And check the "Lock User After Exceeding Max Failed Login Attempts" checkbox. I don't know if you can increase the time of the "temporary" lock. 回答2: By default, Artifactory comes with a built-in embedded Derby

问题 I wont to move UIElements in ScrollViewer. I have somthink like this: <ScrollViewer x:Name="scroll"> <Canvas x:Name="sheet" Width="480" Height="10000"> <Rectangle Canvas.Left="51" Canvas.Top="116" Height="114" Width="337"/> </Canvas> </ScrollViewer> I move the rectangle using ManipulationDelta event. However when I do it the scrollViewer scrolls as well. How to lock scrolling of ScrollViewer? that code doesn't help at all. ScrollBarVisibility.Disabled; I've lost 3 days to find solution and I

问题 I read an answer on this site says the spin-lock reduce the overhead with context switches, and after that I read an textbook statement related to this: Spin-lock makes a busy waiting program not be interrupted. My question is on the title. Since the book uses while-loop to indicate the implementation of the spin part of a spin-lock, the following is my reasoning trying to explain myself with this consideration. This sounds like if there is a program with a busy waiting while loop then all

问题 Lets say there are 3 users A,B,C hitting to the db and runs a update query at the same point of time(Not even a milisecond diff). Example Scenario : Lets say we have a ref_Product_qty table which stores the product id and quantiy available in the warehouse. Now we have a "Add to Cart" button on our site. When thousand of user will hit this button at the same time there is a sure possibility of overlapping and we have this query running behind. if (qty > 0) { UPDATE ref_Product_qry SET qty =

问题 I have a Google Spreadsheet script function onFormSubmit(e) that is called by a trigger whenever someone submits my form. Within the function I create a temporary copy of a template document and search and replace in it based on the submitted form values. Then that temporary copy is converted to a pdf and emailed to several email addresses, and then deleted. Now I've read that locking may be an issue here, and so I decided to get a LockService.getScriptLock() , and wrap my script in a lock

问题 Wow, I wish I'd known about this page https://github.com/zaphoyd/websocketpp/blob/experimental/examples/broadcast_server/broadcast_server.cpp written by my c++ hero https://stackoverflow.com/users/1047661/zaphoyd before I started my c++ websocket adventure. Tons of lessons there. If I'm reading it correctly (that's a stretch lol), it looks like connections and message sends & receipts are all handled in a single thread (can't wait til he "multi-threads" that or whatever it's called since he

问题 I have a class that contains a List(of T) used in a multithreaded application. I have three methods Get, Add and Remove where these access and modify the List(of T). I was using SyncLock to lock m_List any time I queried it for the desired object as well as when I added or removed objects. However I'm curious as to if there is a performance gain by simply locking m_List when I add an object or remove an object as opposed to when I'm searching for a desired object? Public Shared sub Add

问题 I want to free a structure with spin_lock is embedded. scenario is as follows: I have two functions f1 () { ***************** spin_lock_irqsave(&my_obj_ptr->my_lock, flags) .... .... ........................................ here f2 is called spin_lock_irqstore(&my_obj_ptr->my_lock, flags) ******************* kfree(my_obj_ptr) } and f2 has similar content with f1. when f2 is called my_lock is being used, f2 must busy waiting. however, when f2 is entering the critical section, my_obj_ptr is

问题 in my case, I just start other activity to remove lock screen. However, I saw any app to dismiss lock screen and that is really smooth. I think the way is different with me.. plz~ tell me how to dismiss lock screen~ and how do i use keyguard to do that? in advance, thank you!! 回答1: If you're talking about the keyguard, then you want to take a look at the KeyguardManager class. You can get an instance of it like this: KeyguardManager km = (KeyguardManager) context.getSystemService(Context