OpenCL Kernel wait/delay
c,opencl,delay,wait,data-synchronization
The OpenCL spec is designed for data crunching. Not for wait/sleeps. Even if you may achieve it, you will be breaking a lot of the good design rules of OpenCL. In fact, many GPUs will crash or kill the execution if you try to sleep them. Please reconsider what you...
Libgdx how to stop for loop until actor action has finished/completed
Instead of blocking the loop, you could try setting a delay on each action for the calculated time it will take for the fadeIn to start running. Something like this: float delay = 0; for (int i = 0; i < cells.length; ++i) { SequenceAction sa = Actions.sequence(Actions.delay(delay), Actions.fadeIn(1f)); cell.addAction(sa);...
Wait until Animation is finished to follow (SWIFT)
ios,swift,animation,nstimer,wait
If you want to use the completion block at the end of the animation, you should call delay and options, too. UIView.animateWithDuration(0.3, delay: 0.0, options: UIViewAnimationOptions.CurveLinear, animations: { // put here the code you would like to animate self.IMGVIEWcat.center = CGPointMake(self.IMGVIEWcat.center.x + 2, self.IMGVIEWcat.center.y) }, completion: {(finished:Bool) in // the...
How do I run tasks in parallel and select the first result that satisfies a given condition in C#? [duplicate]
c#,.net,parallel-processing,task-parallel-library,wait
In TPL, task cancellation is cooperative, so you need to define some means of indicating to your other tasks that they should stop executing. The most common way to do this is through CancellationTokenSource, whose token can be checked for cancellation within your RunFuncX methods. static void Main() { InputDataType...
For protractor test, can we get waitElement object value without browser.wait() function?
javascript,asynchronous,protractor,wait
Just use then as browser.wait returns a promise which resolves or rejects depending on the condition passed to browser.wait: http://angular.github.io/protractor/#/api?view=webdriver.WebDriver.prototype.wait waitObject(element, 1000).then(function () { // The condition resolved truthy, element is present }, function () { // Timed out }); This way you can do different things depending on if...
Java - order of execution after wait
No . .there is no guarantee that a set of awoken threads will be executed in any particular order. (This may happen in order because of a particular implementation of JVM or the speed of the computer the program is run on, or many other load based variables. However, there...
Wait for AJAX with iOS
Simple mistake here. What you're assuming is happening, as I understand it, is that the page will load (and render) when you make calls to [NSData dataWithContentsOfURL:options:error:] etc. - This is not the case. These requests that you've listed only retrieve the HTML in a single request, they do no...
Summing up decimals returned within task
You should be able to use SyncLock to resolve your issue. SyncLock can only be used on reference types. All that's needed is to create a new object that is within the scope of the current instance and then let SyncLock lock on that object. Here's a short little console...
Using yield WaitForSeconds() in a function returning void
c#,unity3d,wait,void,yield-return
If I remember correctly, Unity's Invoke(func) is only willing to start a coroutine in Javascript, where the difference between a void and a coroutine is less strict. What I would do is use StartCoroutine(Smile()); and start Smile with another yield return new WaitForSeconds(0.2f);, or better yet have Smile take a...
Android threads can't get notify() to work properly using wait() and notify()
java,android,multithreading,wait,notify
Slightly modified code: public class MainActivity extends Activity { private TextView mText; private EditText mUserInput; private CounterThread mCounterThread; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main_2); mText = (TextView) findViewById(R.id.text); mUserInput = (EditText) findViewById(R.id.userInput); mCounterThread = new CounterThread(); mCounterThread.start(); } @Override public synchronized void onPause() { super.onPause();...
waiting for infinte time when timeout is given
Key to your question lies in java doc of wait which states as follows :- The specified amount of real time has elapsed, more or less. If timeout is zero, however, then real time is not taken into consideration and the thread simply waits until notified. So, it random return...
what will be the disadvantage if we will use notify immediately before wait
I think I got it, if we will notify first then it might be possible that all threads will woke up and try to access the synchronized function but as wait is not called so it is still locked. Lock will be released only by calling wait so it will...
can Multiple threads depend on a single manual Kill-event?
multithreading,recursion,wait,waitforsingleobject,waitformultipleobjects
As Hans suggested in the comment, the problem was in fact with the message pump being blocked. Always best to assign separate threads for tasks that might take long or might themselves need access to the message pump.
Threads in Cached Thread Pool never being removed
java,multithreading,caching,wait,executor
Your tasks most likely wait forever so I wouldn't expect them to die, no matter how long you wait. When you notify() and there isn't any threads waiting the notify is lost. Most likely you have notified three times before your three tasks have a chance to start.
How to create an anonymous pipe between 2 child processes and know their pids (while not using files/named pipes)?
From the Bash man pages: ! Expands to the process ID of the most recently executed back- ground (asynchronous) command. You are not running a background command, you are running process substitution to read to file descriptor 3. The following works, but I'm not sure if it is what you...
Stuck on wait() after fork()
It is an error for a process to call wait() when it has no uncollected children (wait() will return -1 and set errno to ECHILD in that case), so the fact that wait() hangs indicates that there is a child process that has not been collected. Once that child process...
How do you kill zombie process using wait()
c,linux,virtualbox,wait,zombie-process
How do you know (and) where to put the "wait()" statement to kill zombie processes? If your parent spawns only a small, fixed number of children; does not care when or whether they stop, resume, or finish; and itself exits quickly, then you do not need to use wait()...
VBA: Does 'Wait 1' wait 1 second?
After some various testing with system load and idle while running the macro. I've come to this. Thw 'Wait' function waits the entered time, even if windows was under full / close to full load (95% CPU usage, 3.4 RAM used out of 4 GB) and the entered time is...
program stuck on wait()
It may have to do something with this line: exitstatus==true; Did you, by any chance meant: existatus = true; gcc reports something like this for it anyway (-Wall): warning: statement has no effect [-Wunused-value] exitstatus==true; That's a pretty nice example showing why enabling warnings is a good practice ... There's...
What does Protractor browser.wait return if the condition never becomes true?
There are two ways to do this: First you can use the third argument of browser.wait to a string that will be sent as an error message. Like so: browser.driver.wait(function(){ return //condition }, timeout, 'Error message string') .then(function(){ callback(); }); Or secondly using a second argument to the .then like...
jquery check or wait for the variable has value and then continue
Straight Forward: var someVar = false; $('.someEl').animate({'marginLeft': 100}, 500, function () { // animating complete someVar = true; someFunction(); }); function someFunction () { // watch someVar to be true and then run the code in this function } With kind of a watch: var someVar = false; $('.someEl').animate({'marginLeft': 100},...
Swift How to wait for callback to finish before exiting function?
swift,callback,wait,apple-watch
Could you have syncRequest() take a closure that gets called with the results when ready? Change the definition to something like: func syncRequest(callback:(KKWatchSyncResponse?)->Void) { ... } Then at the end of your createRequest() call, you could call the callback on syncResponseDict, since now it's been populated with your data... callback(syncResponseDict)....
Java make GUI wait for a timer
java,multithreading,swing,timer,wait
Take the code from after you call waitForTwoSeconds and place within the actionPerformed method... public void doThings() { area.setText("Start, "); // Want program to wait for two seconds waitForTwoSeconds(); } public void waitForTwoSeconds() { timer = new Timer(2000, new ActionListener() { @Override public void actionPerformed(ActionEvent e) { area.append("Finished Waiting, ");...
Shell Job Control: Track status of background with WNOHANG wait
It's for implementing notifications like the following for background jobs: $ cmd_1 & $ cmd_2 $ cmd_3 [1]+ Done cmd_1 $ (Something like sleep 5 is a good cmd_1 to try this out with.) In the above, it's assumed that the backgrounded cmd_1 job finishes while cmd_3 is being typed...
make java multithread wait until input given
java,multithreading,input,wait
You can use CyclicBarrier from java.util.concurrent package static CyclicBarrier b = new CyclicBarrier(nConnections); public void run() { // make the database connection b.await(); //threads will stop here untill nConnections are opened ... ...
Wait the end of a predicate Prolog
Yes, of course, there is a solution. You are getting a list of results so you need to filter them by specific predicate or just take last one because you sort them in increasing order. Prolog generates these solutions one by one. Sometimes we would like to have all the...
Java: coding basic multithreading
java,multithreading,wait,notify
Kennedy's answer gives the solution to the question you asked about the exception, but the bigger problem is that you are using wait()/notify() with only one thread. The thread that is supposed to call playback() is the one that executes ticking(), so it will pause for a quarter beat. I'd...
Where do Zombie processes go after their parent dies?
c,linux,linux-kernel,wait,zombie-process
According to man 2 wait: A child that terminates, but has not been waited for becomes a "zombie". The kernel maintains a minimal set of information about the zombie process (PID, termination status, resource usage information) in order to allow the parent to later perform a wait to obtain information...
How make the script wait/sleep in a simple way in unity
c#,unity3d,monodevelop,sleep,wait
The first answer provided is missing the new keyboard will cause some error. You are close. You are missing the return followed by the new keyword. And the number of seconds to wait for should have 'f' at the end. It should look like this: yield return new WaitForSeconds (3f);...
How to use WebDriverWait.until without a By locator?
java,selenium,xpath,selenium-webdriver,wait
Rather than retrieving the webelement using the method findDataAutomationId, you can directly find the webeelement, and then click on it as shown below: public void clickOnDataAutomationId(String dataautomationid) { WebDriverWait wait = new WebDriverWait(driver, 10); WebElement element = wait.until(ExpectedConditions.visibilityOfElementLocated(By.xpath("//*[contains(@data-automation-id, '" + dataautomationid + "')]"))); element.click(); } OR, if the data-automation-id is...
PhantomJS javascript wait until function complete
javascript,asynchronous,phantomjs,wait
page.open() is an inherently asynchronous function. The only reliable way to do this is to use callbacks in the PhantomJS script: var address = address; function changeAmount(callback) { var page = require('webpage').create(); page.open (address, function(){ //parse json, set amount to something (usually 4) var amount = 4; callback(amount); }); }...
Why can't I use notifyAll() to wake up a waiting thread?
As @MadProgrammer mentioned, you are not synchronizing on the same lock. A lock is, well, not sure how else to describe it. It's a lock. To lock and wait in Java, you pick an object to represent the "lock". If 2 threads synchronize on 2 different objects, it's like the...
java.util.concurrent.locks.Condition awaitUninterruptibly()
java,multithreading,concurrency,wait
From the code: public final void awaitUninterruptibly() { Node node = addConditionWaiter(); int savedState = fullyRelease(node); boolean interrupted = false; while (!isOnSyncQueue(node)) { LockSupport.park(this); if (Thread.interrupted()) interrupted = true; } if (acquireQueued(node, savedState) || interrupted) selfInterrupt(); } So the waiting is done in a loop, which would remove the need...
Running wait() on a Thread instance from within main() in Java
java,multithreading,wait,synchronized
The explanation about how the thread finishing sends a notifyAll is relevant and correct, +1 from me. I'll try to add some information about why this is relevant. When you call synchronized(t) { t.wait(10000);} in the main thread, it is the main thread that does the waiting. t is the...
Is there standard implementation for thread block/resume in java SE?
have a a look at the classes in java.util.conucurrent ... CountDownLatch might be a solution for your problem if i understand your problem correctly.
Make a PyWinAuto Program wait for a popup with Python
python,popup,automation,wait,pywinauto
The only case I can imagine is that app.Phazer.Static2 is matched with another control sometimes. app.Phazer.Static2 is equivalent to app.Phazer.ChildWindow(best_match='Static2'). Best match algorithm used in pywinauto can capture another static text with similar name. Comparison operator == does't raise any exception, so you may get incorrect static text, it will...
How to wait until my batch file is finished
c#,windows,batch-file,cmd,wait
The start command has arguments that can make it WAIT for the started program to complete. Edit the arguments as show below to pass '/wait': ProcStartInfo.Arguments = "/c start /wait batch.bat "; I would also suggest that you want your batch file to exit the cmd envirionment so place an...
Java multi-threaded Server notify() IllegalMonitorStateException
You have to call notify in synchrnonized block synchronized(lock) { player p2 = new player(id,socket); Players.add(p2); id++; lock.notify(); } ...
Which wait is more preferred in selenium Webdriver using Java? (Implicit or Explicit)
To answer which wait to use will be very specific beacuse the answer may change depending on the Web-element you are focusing , Platform and many more. But what i can suggest you to use explicit wait in your situation as you specified that you are using multiple browsers and...
Check if file written by process A is ready to be read by process B
javascript,linux,shell,wait,lsof
I lack the ability to comment, so an answer this shall be. Regardless, what it sounds like is a problem with asynchronous execution- the java program calls the bash script, which is handled as a separate program by the OS and thus runs concurrently with the java program. For everything...
android waiting on something
Welcome to the wonderful world of asynchronous events. In order to do what you want, the approach is not to "wait" (because everything would then freeze), but to "listen". When something takes long in Android, such as the Text To Speech, you have to listen for a event. If you...
WaitForSingleObject on signalled thread gives WAIT_FAILED, why?
multithreading,mfc,thread-safety,wait
Fixed it! Used GetLastError() and it turned out the handle for WaitForSingleObject(m_hDoIt_Thread, 0); was invalid. The reason for that is By default an MFC thread frees its thread handle and deletes the thread object when it exits. That leaves you with an invalid thread pointer and handle, so this way...
Waiting for a selector in a loop with CasperJS
javascript,phantomjs,wait,casperjs,headless-browser
The problem is that all then* and wait* calls are asynchronous step functions. That is why you can't use a loop around them. The normal way this is solved is by using a recursive function: This is a re-imagined version of your function: casper.waitContinuouslyUntilSelector = function(checkRow, finalSelector, then, onTimeout, timeout,...
Program gets halted: wait() and notify()
java,multithreading,wait,synchronized,notify
The problem here is simply that both threads go straight into wait. Thread 1 gets so, prints value then waits. Thread 2 then gets so, prints value then waits. So both are sleeping away, since nobody is there to notify them. So, a simple fix would be to do so.notify(),...
Webdriver Ignores Wait - Firefox, Python
python,firefox,selenium-webdriver,webdriver,wait
No, implicitly_wait() would not stop/halt the execution at moment you call it. It is called once per session and sets the implicit timeout used while selenium is finding an element or executing a command, quote from the documentation: implicitly_wait(time_to_wait) Sets a sticky timeout to implicitly wait for an element to...
Wait a few seconds in Swing
Use Swing Timer instead of Java Timer and Thread.sleep. Please have a look at How to Use Swing Timers Timer timer = new Timer(5000, new ActionListener() { @Override public void actionPerformed(ActionEvent arg0) { secondMethod(); } }); timer.setRepeats(false); timer.start() ...
How do I time out a REGQUERY command in Powershell?
Thanks! That was exactly what I needed. I set the count to 1 ping, and it's MUCH faster than 42 second timeouts. Here is the code for anyone this might help... $File = Import-Csv 'c:\temp\powershell\regcomplist.txt' $Results="" $text="Machine Name,Regkey Value, Runtime" $fileout = "C:\Temp\powershell\regquery.csv" Write-host $text Out-File -FilePath $fileout -InputObject $text...
Pi run command and wait
If I understand your problem, what you want is to play the MP3 every time the state changes from True to False, but instead your code is playing it over and over as long as the state stays False. As a side note, if ( GPIO.input(22) == False ): violates...
Run Serial inside Paralell Bash
linux,bash,while-loop,parallel-processing,wait
You are not showing us how the lines you read from the file are being consumed. If I understand your question correctly, you want to run script1 on two lines of filename, each in parallel, and then serially run script2 when both are done? while read first; do echo "$first"...
Checking for the status of a job on the webserver R
I had a similar problem a few years ago. I decided to ask the Windows Task Manager (yes, I have sinned) to run a specific script on a regular basis. Your script could be along the lines of isok <- FALSE i <- 1 while (isok == FALSE) { record.start...
Java executors: How to notify a single waiting thread within the executer?
java,multithreading,wait,notify,executor
Object.notifyAll notifies all threads waiting on this Object's monitor. Object.notify notifies one (random) thread waiting on the monitor. Is this what you were looking for?
Wait Inside While Loop to Periodically Check Status
Try spinning up a task to avoid the main thread all together. Try something like this: private CancellationTokenSource tokenSource; private string RequestID; ApiResponse response; private void form1_Load(object sender, EventArgs e) { freeUI(); } private void do_stuff() { RequestID = api.SendRequest(info); DateTime fiveMinutesFromNow = GetFiveMinutesFromNow(); response = null; while (response !=...
How to automate delayed screen capture/paste procedure using PowerPoint VBA?
screenshot,wait,copy-paste,powerpoint-vba,powerpoint-2010
There should be a line gap while pasting acivepresentation Sub PrintScreen() keybd_event VK_MENU, 0, 0, 0 keybd_event VK_SNAPSHOT, 0, 0, 0 keybd_event VK_SNAPSHOT, 0, KEYEVENTF_KEYUP, keybd_event VK_MENU, 0, KEYEVENTF_KEYUP, 0 ActivePresentation.Slides.Add 1, ppLayoutBlank ActivePresentation.Slides(1).Shapes.Paste End Sub ...
Stop and Continue Looping of For Loop In Java
I have arraylist of size 2500 and i need for loop to iterate 500 times and then wait and call a function and again continue looping and stop after 500 and so on Create a temporary List to add each item into. Use a for loop and check the...
how to decide the looping condition for wait() in Java
java,multithreading,wait,notify
Here, maybe this few lines will push you in the right direction, as a follow up to my previous comments. class LastPrintedMonitor { public boolean wasLastEven = false; } class PrinterOdd implements Runnable { LastPrintedMonitor monitor; public PrinterOdd(LastPrintedMonitor monitor) { this.monitor = monitor; } @Override public void run() { for...
VBS - How to pause a script until user presses a key?
You don't have a lot of choices. If you have a console script, and I'm assuming you do, you can read input from the user but it only registers when you press [ENTER]. So you could pause until the enter key is pressed. For example: WScript.Echo "Press [ENTER] to continue..."...
bash shell: Avoid alias to interpret $!
Use a function, not an alias, and you avoid this altogether. my_rsync() { # BTW, this is horrible quoting; run your code through http://shellcheck.net/. # Also, all-caps variable names are bad form except for specific reserved classes. rsync -av ${PATH_EXCLUDE_DEV} ${PATH_SYS_DEV}/ ${PATH_SYS_SANDBOX}/ &>/dev/null cd - } ...in this formulation, no...
Java wait - synchronized in/outside while loop
First of all, the correct way of using ArrayBlockingQueue or really any BlockingQueue for Producer/Consumer problems is shown in the documentation of that interface, slightly adjusted for your example: Producer try { while (true) { queue.put(1); } } catch (InterruptedException ex) { // something want's us to stop. } Consumer...
How to make a browser console wait in a javascript
javascript,browser,console,wait
using setTimeout, which executes only once after the delay provided setTimeout(function(){ console.log('gets printed only once after 3 seconds') //logic },3000); using setInterval , which executes repeatedly after the delay provided setInterval(function(){ console.log('get printed on every 3 second ') },3000); clearTimeout is used to clear them up !!!...
Can I make a Dart function “wait” for a set amount of time or input?
Here's an example of how to do this using the new async/await feature. Note the async declaration at the start of method bodies, and the await statement before the call to pause() and showText(). Future pause(Duration d) => new Future.delayed(d); Future waitFor(int c) => document.body.onKeyDown.firstWhere((e) => e.keyCode == c); Future...
make many process wait before the main process
@ECHO OFF SETLOCAL :: first method - use flag files (qtest.bat substituted for robocopy) :: make a tempfile :maketemp SET "tempfile=%temp%\%random%" IF EXIST "%tempfile%*" (GOTO maketemp) ELSE (ECHO.>"%tempfile%a") COPY NUL "%tempfile%b">nul&START "" qtestd "%tempfile%b" f:\data1 d:\backup\ COPY NUL "%tempfile%c">nul&START "" qtestd "%tempfile%c" g:\data2 d:\backup\ COPY NUL "%tempfile%d">nul&START "" qtestd "%tempfile%d"...
Android calling a network operation continuously?
I would use a Timer/TimerTask in your case. The Timer runs on a differnt thread, and you schedule it a fixed interval of time. E.g. class MyTimerTask extends TimerTask { public void run() { HTTPConnection httpConnection = new HTTPConnection(); httpConnection.extendSession(userId); } } and onCreate Timer timer = new Timer(); timer.scheduleAtFixedRate(new...
Nodejs Childexec execute command for each line in file but wait for the first command to exit before running the next
node.js,wait,exit,readline,child-process
You are looking for sequential loop. That is, execute a next step after previous is finished. The difficulty comes, as Node.js is asynchronous, and there is very little sequential functionality out of the box. There are two options. Recursive callbacks var fs = require('fs'), sleep = require('sleep'), exec = require('child_process').exec,...
How to wait for a child until it reaches CPU time timeout in c/c++?
You can change change the CPU limit of the child, and it will get killed if it exceeds that limit. if (pid == 0) { struct rlimit cpu_lim = {10,10}; //limit to 10 seconds if (setrlimit(RLIMIT_CPU , &cpu_lim) == -1) { perror("setrlimit"); return; } ... With this approach you don't...
wait action not working
wait only applies to other actions. If you want to apply your impulse after a wait you need to add that into a block as an action. once you have your wait action, and your applyImpulse action then we put these together into one sequence. Make sense? //add sprite to...
wait and wait on time differences?
They probably mean Object.wait(long timeout) vs Object.wait(), read java.lang.Object API for details
How to wait for a duration before a sequence is run?
Try: let otherWait = SKAction.waitForDuration(1) let otherSequence = SKAction.sequence([otherWait, SKAction.repeatActionForever(sequence)]) runAction(otherSequence) ...
Wait and Notify in Java threads for a given interval
java,multithreading,thread-safety,wait,notify
Start a wait at the sendMulticast event for X seconds Just use version of wait() which takes timeout argument. Note, that you should manually update timeout value after every successfull wait() call (that is, which return event). Notify at receiveEventsCallback() after all the recieved events has been added to...
Wait for a URL to download all the contents of a webpage
javascript,phantomjs,settimeout,wait
Ok, you problem is to load Content after some timeout. If you are looking for DOM element, you have to use known to you WaitFor function. But if you just want to get page content after timeout, it is so much easier. So lets start. var page = require("webpage").create(); var...
java.lang.IllegalMonitorStateException whilst calling wait from synchronized block
java,multithreading,wait,notify
You should do commonLock.wait(10000) commonLock.notify() You get an exception because you're waiting and notifying on "this". And you didn't synchronize on "this". You might consider using notifyAll() instead of notify(): If you plan to have multiple Waiter threads, keep in mind that notify() will only wake up one Waiter thread...
Wait until the Ajax function is done
javascript,jquery,ajax,function,wait
That's because checksign doesn't return the promise you need to chain on a done function. You don't need the $.when wrapper for one single promise either function next() { checksign().done(function(data) { if (uf == 1) { $("#usrdiv").css("display", "none"); $("#pswdiv").css("display", "inline"); } }); } function checksign() { return $.ajax({ url: "checkuser.php",...
Delay() issue in C
Don't expect too much accuracy from application-level sleep() - like implementation. Usually their timers can easily miss 10-s of milliseconds. In accordance to documentation this Sleep() parameter is in milliseconds. So it is easy just to not notice such pauses. Especially having not so accurate implementation. My recommendation is...
Git pull until there is something to pull
You can pipe git output to awk/grep to look for the message that would have been printed if there's a non empty pull, and then use notify-send to flash a notification message on your desktop. Also I'd recommend not doing git pull with the script, instead do a git fetch...
Java how to delay a program execution
Instead of waiting, you could use a file system watcher to watch a directory and take action when a specific event has been fired. This would allow your applications to not wait unnecessarily or else not to take action too early, which is what happens when you provide a fixed...
block events when waiting for process to exit
One solution is to disable all windows of your first application, as long as the child process is running. In addition, you can set the main window of your application as the owner of the window opened by the child application (should the child application display any windows). If you...
Wait until process in remote server finishes using Fabric
python,server,wait,fabric,remote-server
One way to do this is to change the way you're calling remote_function, and use Fabric execute instead. from fabric.api import execute local_function_1() execute(remote_function) local_function_2() execute should block until the tasks complete. For more info, see Intelligently executing tasks with execute....
Console wait until left mouse button down
Perhaps you have the Quick Edit mode enabled in your app (Properties->Options->Edit Options). Then if you click the cursor enters in selection mode and the app seems to stop until you click again. I've made some checks... It seems that if you enter in Quick Edit mode (and you don't...
Who waits for a shell background process?
The shell gets a SIGCHLD when its child process exits; thus, it can immediately call wait4() in the signal handler to reap it. If you run strace bash, you'll see something like the following: --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=13708, si_status=0, si_utime=0, si_stime=0} --- wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], WNOHANG,...
How to replace synchronized, wait, notify by semaphores? (Producer-Consumer)
java,wait,semaphore,synchronized,notify
Think of a semaphore as a lock that can allow multiple threads to access a shared resource. Whatever number you initialize the semaphore to will allow that many threads to access the resource simultaneously. In Producer-Consumer, the resource is a shared buffer between the two threads. You want to make...
Using CountDownLatch & Object.wait inside recursive block hangs
java,recursion,concurrency,wait,countdownlatch
The main message about wait and notify that I got from JCIP was that I'd probably use them wrongly, so better to avoid using them directly unless strictly necessary. As such, I think that you should reconsider the use of these methods. In this case, I think that you can...
how to make batch wait for multiple subprocesses
You can achieve this by starting your un-rar processes without /WAIT and check whether they're finished using tasklist: @ECHO OFF SET WINRAR="C:\Program Files (x86)\WinRAR" start "" %WINRAR%\WinRAR.exe a -u -m5 "Group 1.rar" "Group 1" "Group 1" start "" %WINRAR%\WinRAR.exe a -u -m5 "Group 2.rar" "Group 2" "Group 2" start ""...
Waiting without Sleeping? (C#)
Use Task.Delay: Task.Delay(1000).ContinueWith((t) => Console.WriteLine("I'm done")); or await Task.Delay(1000); Console.WriteLine("I'm done"); For the older frameworks you can use the following: var timer = new System.Timers.Timer(1000); timer.Elapsed += delegate { Console.WriteLine("I'm done"); }; timer.AutoReset = false; timer.Start(); Example according to the description in the question: class SimpleClass { public bool Flag...
std::condition_variable - Wait for several threads to notify observer
c++,multithreading,wait,condition-variable
You try to use condition variables in a way they are not meant to be used - in this case, you assume that you can count notifications. You can't. You may lose notifications by that, and you are counting spurious wake-ups that are allowed by the standard. Instead, you should...
sikuli (python) script starting at xx hour of the day, wait(“image.png”,highnumber) not working?
There are more ways to Rome, so there is not 1 good answer but there are more. If you would like to make a simple loop that does something at a given time you could simply use: import time image1 = ("image1.png") alarm = '17:37:00' while (True): # Look what...
How to fork and create a specific number of children that perform the same task?
You need to move the call to parentProcess() outside the loop: for (i = 0; i < num_forks; i++) { child_pid = fork(); if (child_pid < 0) { perror("fork\n"); } else if (child_pid == 0) { childProcess(i, goal); } } parentProcess(); Otherwise, the parent waits for each child in turn...
Wait inside loop bash
linux,bash,for-loop,while-loop,wait
Normally you'd use sem, xargs or parallel to parallelize a loop, but all these tools optimize throughput by always having 2 (or N) jobs running in parallel, and starting new ones as old ones finish. To instead run pairs of jobs and wait for both to finish before considering starting...
Wait for an Event - Better solution than polling?
You can use TaskCompletionSource to abstract the event as a Task. You can refer this question for how to do that. You don't even need to refer the answers; question itself shows how. Once you get the Task you don't have to poll anymore. You can do all sort of...
Proper way to use fork() and wait()
Isn't the fact that not using wait() will cause a resource waste until the parent will terminate? When a child process is running, there's no wastage of resource; it's still doing its task. The resource waste that your citation talks about is only when a child dies but it's...
Can't set timeout for Qt's waitForConnected
From the Qt documentation for QAbstractSocket: Waits until the socket is connected, up to msecs milliseconds. If the connection has been established, this function returns true; otherwise it returns false. You said the method returns false after about 3 seconds. It could be a normal behaviour. See this code: #include...
Using chrono of C++11 with _USE_32BIT_TIME_T on
c++,c++11,visual-studio-2013,wait,chrono
Apparently there is a bug with Visual Studio: http://connect.microsoft.com/VisualStudio/feedbackdetail/view/972033/std-chrono-and-use-32bit-time-t-dont-work-togther I ended up using boost instead of standard C++11 libraries....
How can a loop be completed by two thread? say loop from count=1 to count=4 by ist thread and count =5 to 8 by 2nd thread?
java,multithreading,wait,notify
To achieve that you can create two threads, and make one waiting for the other, you can read about joining a thread here: http://docs.oracle.com/javase/tutorial/essential/concurrency/join.html I was thinking in something like: public class Counter extends Thread { private final int countFrom; private final int countTo; private final Counter counterToWaitFor; public Counter(final...
How to use a 'wait' command inside any loop?
It depends on where do you have the loop. If you run the loop in main thread, you can't "simply insert a delay" into it, because it will block execution, and Java doesn't have anything like C#'s async&await to "easily" solve this. So, the easiest way to do this is:...
Child process does not print anything
I spot two issues in your code. Where did you allocate memory for host? without that, its undefined behaviour. strncpy() is very unreliable. use of strcpy() is preferred. Change your code to allocate memory before copying. path=strchr(url, '/'); n=strlen(url)-strlen(path); host = calloc (n, sizeof (char)); //memory allocation strcpy(host,url); //use strcpy...