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Check whether or not the current thread is the main thread
... block();
}
else
{
dispatch_async(dispatch_get_main_queue(), block);
}
}
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The SQL OVER() clause - when and why is it useful?
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1 Mark Male 5000
2 John Male 4500
3 Pavan Male 5000
4 Pam ...
Copy file or directories recursively in Python
Python seems to have functions for copying files (e.g. shutil.copy ) and functions for copying directories (e.g. shutil.copytree ) but I haven't found any function that handles both. Sure, it's trivial to check whether you want to copy a file or a directory, but it seems like a strange omission.
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OceanBase使用libeasy原理源码分析：客户端 - 数据库(内核) - 清泛网 - 专...
...表元素就是easy_hash_list_t类型
easy_hash_list_t send_queue_hash;
// 用于串入发送队列链表的节点
easy_list_t send_queue_list;
// 当session的包返回时处理响应的回调函数，对于OceanBase 0.4的mergeserver来说，实际上...
Execute the setInterval function without delay the first time
...etInterval(function hello() {
console.log('world');
return hello;
}(), 5000);
There's obviously any number of ways of doing this, but that's the most concise way I can think of.
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Cron job every three days
Is it possible to run a cronjob every three days? Or maybe 10 times/month.
11 Answers
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In Swift how to call method with parameters on GCD main thread?
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Modern versions of Swift use DispatchQueue.main.async to dispatch to the main thread:
DispatchQueue.main.async {
// your code here
}
To dispatch after on the main queue, use:
DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
// your code here
}
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Wait until file is unlocked in .NET
...stFile));
You can also define the retry count, and the wait time between retries.
NOTE: Unfortunately, the underlying Win32 error (ERROR_SHARING_VIOLATION) is not exposed with .NET, so I have added a small hack function (IsSharingViolation) based on reflection mechanisms to check this.
/// &...
What does %~dp0 mean, and how does it work?
I find %~dp0 very useful, and I use it a lot to make my batch files more portable.
7 Answers
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Python __call__ special method practical example
...lass Worker(object):
def __init__(self, *args, **kwargs):
self.queue = queue.Queue()
self.args = args
self.kwargs = kwargs
def add_task(self, task):
self.queue.put(task)
def __call__(self):
while True:
next_action = self.queue.get()
...