So I call a “loop handler” script which does various checks before executing the loop script it is told to execute or telling the loop to stop, depending on the state of the loop, of course (which is determined by the various checks the “loop handler” script does). I am now trying to switch on/off these endless loops from an admin CP. Here’s more precisely what I’m trying to do: I have endless loops (php scripts) communicating with a remote server (we need to have them send data to this server every 60 seconds or so). I don’t know how to check UNIX line endings, to tell you the truth.Ībout the cron, it sounds very interesting but I’m not sure it would be useful on this project. If the case was video encoding, you’d have 50 video encoders going simultaneously, eating up all your precious CPU.ĮxecInBackground('./sleep.php') //also tried with full pathĪgain, nothing gets written on write.php. The advantage of this method is that you won’t have fifty tasks running simultaneously because fifty people happened to access that particular webpage. This would be ideal with a high amount of traffics and a server cluster setup. If the server runs out of tasks to do, the server would just sleep. You can also do it another way using a server modal where you have a server running all the time that takes requests for tasks and completes queued tasks until there is nothing left to do. Otherwise, if there’s stuff to do in the queue and nothing is currently being processed, it would perform a task from the queue. If there’s nothing to do, the cronjob task will just quit. The cronjob task, when it runs, checks if there’s anything in the queue that needs to be done and whether a task is already running. If you want a task done, you put an entry in a queue you store somewhere, such as in your database. Regarding kyberfabrikken’s suggestion, you would do it by having a cronjob task that runs at a specified interval. You might also need to make sure that the script is using UNIX line endings. Of course, if you do that kind of 'wait until something. For example, if you use PHP language, you should call. Second, sleep.php needs to be chmodded 0755. The best approach is to have some mechanism to actively detect the thing becoming true (rather than passively polling for it having become true) this could be any kind of wait-handle, or maybe a Task with Wait, or maybe an event that you can subscribe to to unstick yourself. Programming languages have their way of making the program stop for some seconds or milliseconds. So the process must be created first, this is because at low level it is very complicated to manage processes that are created within a coroutine.You need the shebang line at the top of your file: If using a process within coroutines, the process should be created in the main process space first and then used within a coroutine, not the other way round, the example below shows how this can be done. Otherwise if the parent does not wait, the child processes will end up becoming zombie processes and wasting system resources. When child processes are started from the parent, the parent process must always call Coroutine System functions wait() or waitPid() so that resources can be freed up when those processes are done. Definition and Usage The sleep () function delays execution of the current script for a specified number of seconds. You can also use OpenSwoole\Process::wait but take note that pcntl_wait should NOT be used within a coroutine context, it will not work correctly and will block the current process. The coroutine resumes when the wait finishes. Using this method will allow the coroutine to yield while waiting for another process to complete, not blocking the current process space. Let’s see the code snippet below, showcasing the use of Implicit wait. Wait for outside process to complete before continuing. driver.manage().timeouts().implicitlyWait(Time Interval to wait for, TimeUnit.SECONDS) The default time for Implicit wait is zero and it keeps polling for the required element after every 500 milliseconds.
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