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Difference between wait() and sleep()
... is being waited on whereas a sleep cannot. Also a wait (and notify) must happen in a block synchronized on the monitor object whereas sleep does not:
Object mon = ...;
synchronized (mon) {
mon.wait();
}
At this point the currently executing thread waits and releases the monitor. Another thr...
Why do you have to link the math library in C?
...re than GCC conservatism: "it's always worked like that". I only wish they applied the same reasoning to their compiler extensions.
– anon
Jun 23 '09 at 17:59
...
What reason is there to use null instead of undefined in JavaScript?
...vars to null. Then I'm (pretty) sure that undefined means that a disaster happened. Just imho.
– Pete Wilson
Jul 7 '11 at 1:14
...
How far can memory leaks go?
...erating systems free all resources held by processes when they exit.
This applies to all resources the operating system maintains: memory, open files, network connections, window handles...
That said, if the program is running on an embedded system without an operating system, or with a very simpl...
How can I do something like a FlowLayout in Android?
...yout_width="match_parent"
android:layout_height="wrap_content"
app:flexWrap="wrap">
<!-- contents go here -->
</com.google.android.flexbox.FlexboxLayout>
For build instructions, see the github repo.
More about this - https://android-developers.googleblog.com/2017/02/...
Java - sending HTTP parameters via POST method easily
...conn.setRequestMethod( "POST" );
conn.setRequestProperty( "Content-Type", "application/x-www-form-urlencoded");
conn.setRequestProperty( "charset", "utf-8");
conn.setRequestProperty( "Content-Length", Integer.toString( postDataLength ));
conn.setUseCaches( false );
try( DataOutputStream wr = new Da...
MFC学习总结 (90个技巧) dlg 上建立View - C/C++ - 清泛网 - 专注C++内核技术
...VERIFY(m_wndAboutButton.Create(_T("MyAbout"),
"" WS_VISIBLE,rc,this,ID_APP_ABOUT));
"// TODO: Remove this if you don't want tool tips or a resizeable toolbar
"m_wndToolBar.SetBarStyle(m_wndToolBar.GetBarStyle() |
"CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC);
再在RecalcLayout函数里...
Is APC compatible with PHP 5.4 or PHP 5.5?
...
It appears that the bug "may" have been fixed in the latest revision to the trunk. I've got it working now with PHP 5.4.0.
svn co http://svn.php.net/repository/pecl/apc/trunk/ apc-trunk
cd apc-trunk
phpize
./configure
make
...
How to debug Lock wait timeout exceeded on MySQL?
...ks a table, then sleeps while it waits for something non-MySQL-related to happen."
After re-re-reviewing the show engine innodb status log (once I'd tracked down the client responsible for the lock), I noticed the stuck thread in question was listed at the very bottom of the transaction list, benea...
What is the difference between a thread and a fiber?
...ht-weight, cooperative threads. Both are separate execution paths for your application.
With threads: the current execution path may be interrupted or preempted at any time (note: this statement is a generalization and may not always hold true depending on OS/threading package/etc.). This means tha...