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App Inventor 2 中文网原创内容 · App Inventor 2 中文网
...ventor 2 使用 MaterialIcons 图标字体，快捷展示专业图标
【Sleep】App Inventor 2 模拟sleep函数
【列表过滤】App Inventor 2 过滤蓝牙设备列表
【代码简洁之道】App Inventor 2 任意(Any)代码块
【技巧】代码块导出图像，以及还原
【技巧...
How to prevent multiple instances of an Activity when it is launched with different Intents
...ate().getTime() - timeStart < 100) {
Thread.currentThread().sleep(25);
if (!lastLaunchTag.equals(LauncherActivity.lastLaunchTag)) {
break;
}
}
Thread.currentThread().sleep(25);
launch(intent);
} catch (InterruptedExce...
Why must wait() always be in synchronized block
...checks the state of the predicate at some point slightly BEFORE it goes to sleep, but it depends for correctness on the predicate being true WHEN it goes to sleep. There's a period of vulnerability between those two events, which can break the program.
The predicate that the producer and consumer ...
App Inventor 2 中文网原创内容 · App Inventor 2 中文网
...ventor 2 使用 MaterialIcons 图标字体，快捷展示专业图标
【Sleep】App Inventor 2 模拟sleep函数
【列表过滤】App Inventor 2 过滤蓝牙设备列表
【代码简洁之道】App Inventor 2 任意(Any)代码块
【技巧】代码块导出图像，以及还原
【技巧...
Why are Subjects not recommended in .NET Reactive Extensions?
...ach, or for simple cases, you could use something like Observable.Interval.Select(_ => <db fetch>). You may want to use DistinctUntilChanged() to prevent publishing updates when nothing has changed in the source data.
The source of data is some kind of asynchronous api that calls your callb...
Catch a thread's exception in the caller thread in Python
...hat_raises(do_raise):
for i in range(3):
print(i)
time.sleep(0.1)
if do_raise:
raise Exception()
for i in range(3):
print(i)
time.sleep(0.1)
with concurrent.futures.ThreadPoolExecutor(max_workers=2) as executor:
futures = []
futures.append...
How to get the return value from a thread in python?
...it as:
@threaded
def long_task(x):
import time
x = x + 5
time.sleep(5)
return x
# does not block, returns Thread object
y = long_task(10)
print y
# this blocks, waiting for the result
result = y.result_queue.get()
print result
The decorated function creates a new thread each tim...
Thread pooling in C++11
...e some kind of concurrent data structure, and each thread would presumably sleep on some kind of condition variable, which would be notified when there's work to do. Upon receiving the notification, one or several of the threads wake up, recover a task from the concurrent data structure, process it,...
Why is exception.printStackTrace() considered bad practice?
...ll perform a e.printStackTrace for the exception handling:
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
(The above is an actual try-catch auto-generated by Eclipse to handle an InterruptedException thrown by Thread.sl...
How to capture stdout output from a Python function call?
...e)
capturing.on_readline(on_read)
capturing.start()
print("hello 1")
time.sleep(1)
print("hello 2")
time.sleep(1)
print("hello 3")
capturing.stop()
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