scheduling

问题 Looking through the scheduler source code (2.6.34, kernel/sched.c), I can see how the "pluggable" schedulers are used, and I believe I understand the interface to be implemented. What I don't understand yet is how to get my code built into the kernel. At the very least, pointers to other sites would be appreciated. Right now, I'm grepping for SCHED_FIFO, SCHED_RR, and SCHED_NORMAL in the kernel source tree, so really I'm looking for a more insightful way to look at it :-) EDIT: As some

问题 From reading on Stack Overflow I've seen that many of you don't recommend using Timer Task. Hmmm... but I already implemented this: I have this code: detectionHandlerTimer.schedule(myTimerTask, 60 * 1000, 60 * 1000); The thing is that work of myTimerTask lasts some time. I would like this behavior: wait 60 sec. do task for some time (e.g. 40 - 100 sec). task finished. wait 60 seconds. do task for some time (e.g. 40 - 100 sec). But the code above behaves like this wait 60 sec. do task for some

问题 Besides setting and exact time (i.e. midnight) versus setting a delay (i.e. 24 hours), what's the difference between using AlarmManager and ScheduledExecutorService to run a task periodically? In my case, I need to run a little bit of code to check for new data every night and create a new notification if there is new data. Thanks! 回答1: ScheduledExecutorService runs in your application process. If application process dies, none of the scheduled tasks will run. Hence the need for Service (so

问题 I\'m having a tough time understanding the difference between various methods of the com.google.gwt.core.client.Scheduler interface, specifically, the scheduleDeferred , scheduleFinally , and scheduleIncremental methods. I\'m hampered in my understanding, I think, by my unfamiliarity with the browser event processing loop, to which the Scheduler documentation refers. Would you please explain how these methods differ from each other, and how they work in relation to the browser event loop? 回答1

问题 I\'m trying to understand how Linux handles process scheduling and thread scheduling. I read that Linux can schedule both processes and threads. Does Linux have a thread scheduler AND a process scheduler? If yes, how do they cooperate? 回答1: The Linux kernel scheduler is actually scheduling tasks, and these are either threads or (single-threaded) processes. So a task (a task_struct inside the kernel), in the context of the scheduler, is the thing being scheduled, and can be some kernel thread

问题 When using the Spring 3.0 capability to annotate a scheduled task, I would like to set the fixedDelay as parameter from my configuration file, instead of hard-wiring it into my task class, like currently... @Scheduled(fixedDelay = 5000) public void readLog() { ... } Unfortunately it seems that with the means of the Spring Expression Language (SpEL) @Value returns a String object which in turn is not able to be auto-boxed to a long value as required by the fixedDelay parameter. 回答1: I guess

问题 I\'m working on an exercise on the textbook \"Operating System Concepts 7th Edition\", and I\'m a bit confused about how does fork() work. From my understanding, fork() creates a child process which runs concurrently with its parent. But then, how do we know exactly which process runs first? I meant the order of execution. Problem Write a C program using fork() system call that generates the Fibonacci sequence in the child process. The number of sequence will be provided in the command line.

问题 I\'m writing a scheduling program with a difficult programming problem. There are several events, each with multiple meeting times. I need to find an arrangement of meeting times such that each schedule contains any given event exactly once, using one of each event\'s multiple meeting times. Obviously I could use brute force, but that\'s rarely the best solution. I\'m guessing this is a relatively basic computer science problem, which I\'ll learn about once I am able to start taking computer

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 years ago . Is there some cron like library that would let me schedule some function to be ran at certain time (15:30 for example, not x hours from now etc)? If there isn\'t this kind of library how this should be implemented? Should I just set callback to be called every second and check the time and start jobs scheduled

问题 I would like to run a job through cron that will be executed every second Tuesday at given time of day. For every Tuesday is easy: 0 6 * * Tue But how to make it on \"every second Tuesday\" (or if you prefer - every second week)? I would not like to implement any logic in the script it self, but keep the definition only in cron. 回答1: How about this, it does keep it in the crontab even if it isn't exactly defined in the first five fields: 0 6 * * Tue expr `date +\%W` \% 2 > /dev/null ||