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How to use shared memory with Linux in C
...te: %s\n", shmem);
} else {
printf("Parent read: %s\n", shmem);
sleep(1);
printf("After 1s, parent read: %s\n", shmem);
}
}
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What is the difference between a thread and a fiber?
...by the kernel, although a kernel thread can voluntarily release the CPU by sleeping if it wants. A kernel thread has the advantage that it can use blocking I/O and let the kernel worry about scheduling. It's main disadvantage is that thread switching is relatively slow since it requires trapping i...
C++ Lock-free Hazard Pointer（冒险指针） - C/C++ - 清泛网 - 专注C/C++及内核技术
...障和线程本地存储优化。如果仔细观察，可以发现 Acquire 函数中使用顺序一致性内部屏障 pointer->target_ = ...，x86 平台上会翻译为 mfence 指令，与 lock add 指令相比也不遑多让。在读多写少的前提下，可以将读写两边的屏障替换为非...
How to open, read, and write from serial port in C?
...cking
write (fd, "hello!\n", 7); // send 7 character greeting
usleep ((7 + 25) * 100); // sleep enough to transmit the 7 plus
// receive 25: approx 100 uS per char transmit
char buf [100];
int n = read (fd, buf, sizeof buf); // read up t...
async/await - when to return a Task vs void?
...id AsyncMethod2(int num)
{
await Task.Factory.StartNew(() => Thread.Sleep(num));
}
Yes, use async and await here, they make sure your method still works correctly if an exception is thrown.
for more information see: http://msdn.microsoft.com/en-us/magazine/jj991977.aspx
...
Add subdomain to localhost URL
...er (to work around the permissions).
– Lindsay-Needs-Sleep
Apr 4 '19 at 6:36
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Quick-and-dirty way to ensure only one instance of a shell script is running at a time
...m -f ${LOCKFILE}; exit" INT TERM EXIT
echo $$ > ${LOCKFILE}
# do stuff
sleep 1000
rm -f ${LOCKFILE}
The trick here is the kill -0 which doesn't deliver any signal but just checks if a process with the given PID exists. Also the call to trap will ensure that the lockfile is removed even when ...
What is the need of JSF, when UI can be achieved with JavaScript libraries such as jQuery and Angula
... thing with powerful control over HTML.
– Plain_Dude_Sleeping_Alone
Jul 19 '15 at 21:29
add a...
$(document).ready equivalent without jQuery
...('DOMContentLoaded', function() {
console.log('document is ready. I can sleep now');
});
Concerned about stone age browsers:
Go to the jQuery source code and use the ready function. In that case you are not parsing+executing the whole library you're are doing only a very small part of it.
...
App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎 ...
...整格式的 SQLite 数据库文件上传到应用程序的资产中，此函数就会将其复制到位。
注意：如果您导入的数据库尚未包含完整格式的“android_metadata”表，则 DatabaseCreated 事件将在首次打开数据库时触发。“android_metadata”表是 Androi...