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Why 0 is true but false is 1 in the shell?
...orks have a similar convention - functions that succeed return 0 and and those that fail give back an error code describing the particular failure case.
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TCP 的那些事儿（上） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...个假的时钟绑在一起，这个时钟会在每4微秒对ISN做加一操作，直到超过2^32，又从0开始。这样，一个ISN的周期大约是4.55个小时。因为，我们假设我们的TCP Segment在网络上的存活时间不会超过Maximum Segment Lifetime（缩写为MSL – Wik...
App Inventor 2 DynamicComponents 拓展：动态创建AI2组件对象 · App Inventor 2 中文网
... 中创建组件，你需要事先在 Screen 中设置布局才能执行此操作。
将已创建组件的 ID 更改为新 ID。旧 ID 必须存在，新 ID 必须不存在。
替换 ID 时，它会...
windows service vs scheduled task
What are the cons and pros of windows services vs scheduled tasks for running a program repeatedly (e.g. every two minutes)?
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Fragment or Support Fragment?
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So what's the purpose of the android.app.Fragment then? If you can add this to your answer here with a bit more explanation, I would be fully satisfied. Thanks!
– jonstaff
Jul 10 '13 at 12:47
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iPhone App Minus App Store?
...I have personally tested using the AccelerometerGraph sample app on iPhone OS 3.0.
Create Self-Signed Certificate
First you'll need to create a self signed certificate and patch your iPhone SDK to allow the use of this certificate:
Launch Keychain Access.app. With no items selected, from the Key...
When to use AtomicReference in Java?
...reference, for which monitor-based synchronization is not appropriate. Suppose you want to check to see if a specific field only if the state of the object remains as you last checked:
AtomicReference<Object> cache = new AtomicReference<Object>();
Object cachedValue = new Object();
cac...
Running multiple AsyncTasks at the same time — not possible?
... the stuff from doInBackground(). The issue is initially (in early Android OS versions) the pool size was just 1, meaning no parallel computations for a bunch of AsyncTasks. But later they fixed that and now the size is 5, so at most 5 AsyncTasks can run simultaneously. Unfortunately I don't remembe...
How do I choose between Semaphore and SemaphoreSlim?
... system-wide. This would mean that a SemaphoreSlim could not be used for cross-process synchronization.
The MSDN documentation also indicates that SemSlim should be used when "wait times are expected to be very short". That would usually dovetail nicely with the idea that the slim version is more l...
Why use Ruby instead of Smalltalk? [closed]
... Smalltalk did substantially address the insularity.
The class library of most of the main smalltalk implementations (VisualWorks, VisualAge etc.) was large and had reputation for a fairly steep learning curve. Most key functionality in Smalltalk is hidden away somewhere in the class library, even ...