synchronization

问题 There are several ways to handle synchronization in Vulkan. This is how I understand it: Fences are GPU to CPU syncs. Semaphores are GPU to GPU syncs, they are used to sync queue submissions (on the same or different queues). Events are more general, reset and checked on both CPU and GPU. Barriers are used for synchronization inside a command buffer. In my case I have two command buffers. And I want the second command buffer to execute after the first one. submitInfo.pCommandBuffers =

问题 I have a problem in my project. To describe this issue I have wrote simplified code snippet: function waitFor(fnReady, fnCallback) { var check = function() { if (fnReady()) { fnCallback(); } else { setTimeout(check, 100); // wait another 100ms, and try again } }; check(); } var result = 0; var flag = true; function ajaxRequest() { setTimeout( function() { flag = false; console.log('ping'); },3000 ); } function ajaxRequestHandler() { setTimeout( function() { flag = true; console.log('pong'); }

问题 This question already has answers here : Thread-safe setting of a variable (Java)? (5 answers) Closed 3 years ago . Suppose I have two threads updating an object, and one thread reading from that object with no synchronization. Obviously, this is run condition. However, I am wondering if the variable itself can only partially written. public class CommonObject extends Object { static int memberVar=-1; } public class Input1Thread extends Thread { public void run() { while(true) CommonObject

问题 I have 1417 days of sale data from 2012-01-01 to present (2015-11-20). I can't figure out how to have a single-year (Jan 1 - Dec 31) axis and each year's sales on the same, one year-long window, even when using ggplot's color = as.factor(Year) option. Total sales are type int head(df$Total.Sales) [1] 495 699 911 846 824 949 and I have used the lubridate package to pull Year out of the original Day variable. df$Day <- as.Date(as.numeric(df$Day), origin="1899-12-30") df$Year <- year(df$Day) But

问题 Let's say I have this class: class Zoo { protected String bearName; protected Double trainerSalary; protected Integer monkeyCount; } Can one thread write to these fields, and another one read them, without requiring synchronized access to the Zoo object? Note: these values can be treated separate from one another, so it doesn't matter that the trainerSalary is changed while the monkeyCount is read. EDIT : Just to clarify, the fields are mutable ; only their referenced objects are immutable .

问题 I'm busy with a webdoc that I'm partially creating on hype , the video are hosted on vimeo (so I need to use the vimeo api for some tasks like seekto) but my difficulties should be limited to js. the objective is to display a given image at a given time interval of the video . With my code below, I do get the string "test", "success" and "confirmed success" at the right time in my div id=popimgbox, and I can seek back and forth in the video and still get the right "answear", if I may say so.

问题 My questions pertain to the use of a single OpenGL 4.5 context without any direct memory mapping or explicit synchronisation (hypothetically), with both rendering shaders (invoked with glDrawArrays() ) and compute shaders (invoked with glDispatchCompute() ). Question 1.1: Are all changes to rendering state – such as with glUseProgram() , glEnable() / glDisable() , glStencilFunc() , glStencilOp() , glClearColor() , glStencilMask() , glClearStencil() , glBlendFunc() , glColorMask() , etc. –

问题 I have an objectMapping for my entity User RKObjectMapping* userMapping = [RKObjectMapping mappingForClass:[User class]]; [userMapping mapKeyPath:@"first_name" toAttribute:@"firstName"]; [userMapping mapKeyPath:@"last_name" toAttribute:@"lastName"]; [manager.mappingProvider setMapping:userMapping forKeyPath:@"users"]; [manager.mappingProvider setSerializationMapping:[userMapping inverseMapping] forClass:[User class]]; And I want to save his profile when the application goes background: -

问题 I have a class proposing translations utilities. The translations themselves should be reloaded every 30 minutes. I use Spring Timer support for that. Basically, my class looks like : public interface Translator { public void loadTranslations(); public String getTranslation(String key); } loadTranslations() can be pretty long to run, so while it is running the old translations are still available. This is done by loading the translations in a local Map and just changing the reference when all

问题 I have already setup syncing with Microsoft Sync Framework, and now I need to add fields to a table. How do I re-provision the databases? The setup is exceedingly simple: Two SQL Express 2008 servers The scope includes the entire database Using Microsoft Sync Framework 2.0 Synchronizing by direct access. Using the standard new SqlSyncProvider Do I make the structural changes at both ends? Or do I only change one server and let Sync Framework somehow propagate the change? Do I need to delete