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What is the best way to ensure only one instance of a Bash script is running? [duplicate]
...ile, it will surely die, but processes fork()+exec()-ed from it (like your sleep did) inherit copies of open file descriptors along with flock() locks. Killing the script while sleep is sleeping won't unlock, because sleep process is still holding the lock. For lockable script it's important, becaus...
What's a good rate limiting algorithm?
...minInterval - elapsed
if leftToWait>0:
time.sleep(leftToWait)
ret = func(*args,**kargs)
lastTimeCalled[0] = time.clock()
return ret
return rateLimitedFunction
return decorate
@RateLimited(2) # 2 per second at most
def P...
What is the Swift equivalent of respondsToSelector?
... NSObject
{
func work() { }
func eat(food: AnyObject) { }
func sleep(hours: Int, minutes: Int) { }
}
let worker = Worker()
let canWork = worker.respondsToSelector(Selector("work")) // true
let canEat = worker.respondsToSelector(Selector("eat:")) // true
let canSleep = worker.respo...
Java executors: how to be notified, without blocking, when a task completes?
...d message: " + msg);
}
}
class ExampleService {
String work() {
sleep(7000, TimeUnit.MILLISECONDS); /* Pretend to be busy... */
char[] str = new char[5];
ThreadLocalRandom current = ThreadLocalRandom.current();
for (int idx = 0; idx < str.length; ++idx)
str[idx] = (ch...
How do I abort/cancel TPL Tasks?
... {
// do some heavy work here
Thread.Sleep(100);
if (ct.IsCancellationRequested)
{
// another thread decided to cancel
Console.WriteLine("task canceled");
break;
...
Command line progress bar in Java
..." " + x;
System.out.write(data.getBytes());
Thread.sleep(100);
}
}
}
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Custom thread pool in Java 8 parallel stream
...ommon.parallelism", "20");
s.parallel().forEach(i -> {
try { Thread.sleep(100); } catch (Exception ignore) {}
System.out.print((System.currentTimeMillis() - start) + " ");
});
The output is:
215 216 216 216 216 216 216 216 315 316 316 316 316 316 316 316 415 416 416 416
So you can...
xtreme toolkit pro——CXTPReportControl控件教程 - C/C++ - 清泛网 - 专注C/C++及内核技术
...dReportCtrl;
（3）将控件和变量联系起来，在对话框初始化函数OnInitDialog()中添加如下代码：
m_wndReportCtrlList.SubclassDlgItem(IDC_REPORTCTRL_LIST,this);
4. 设置控件的外观：
//初始化报表的外观
m_wndReportCtrl.AllowEdit(FALSE);
//m_wndReportCtrl.E...
推荐系统算法初探 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...。
2. 推荐算法
算法是什么？我们可以把它简化为一个函数。函数接受若干个参数，输出一个返回值。
算法如上图，输入参数是用户和item的各种属性和特征，包括年龄、性别、地域、商品的类别、发布时间等等。经过推荐算...
Capture keyboardinterrupt in Python without try-except
...ter, anyway.) That'd be very wasteful; try something like while True: time.sleep(60 * 60 * 24) (sleeping for a day at a time is an entirely arbitrary figure).
– Chris Morgan
Oct 6 '11 at 12:04
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