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When should we use mutex and when should we use semaphore
... when to use what -
Semaphore:
Use a semaphore when you (thread) want to sleep till some other thread tells you to wake up. Semaphore 'down' happens in one thread (producer) and semaphore 'up' (for same semaphore) happens in another thread (consumer)
e.g.: In producer-consumer problem, producer wa...
推荐系统算法初探 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...。
2. 推荐算法
算法是什么？我们可以把它简化为一个函数。函数接受若干个参数，输出一个返回值。
算法如上图，输入参数是用户和item的各种属性和特征，包括年龄、性别、地域、商品的类别、发布时间等等。经过推荐算...
How to write a cron that will run a script every day at midnight?
... # Run every minute at 0, 20, and 40 second intervals
* * * * * sleep 00; /usr/local/sbin/run_3times_per_minute.sh
* * * * * sleep 20; /usr/local/sbin/run_3times_per_minute.sh
* * * * * sleep 40; /usr/local/sbin/run_3times_per_minute.sh
To add a cron job, you can do on...
MySQL show status - active or total connections?
... 0 | NULL | show processlist |
| 5 | root | localhost:61704 | webapp | Sleep | 208 | | NULL |
| 6 | root | localhost:61705 | webapp | Sleep | 208 | | NULL |
| 7 | root | localhost:61706 | webapp | Sleep | 208 | | NULL |
+----+--...
Notifier 通知扩展：功能强大的Android通知管理工具，支持通知通道、意图、...
...例如拍摄相机照片。Android为此提供了 startActivityForResult 函数。启动的Activity返回的结果通过操作系统通过 onActivityResult 回调函数传递。调用此函数还表示新启动的Activity已结束。
App Inventor总是使用此函数创建新的Screen和回调函...
Can I set max_retries for requests.request?
...so enable a backoff strategy which makes requests to all http:// addresses sleep for a period of time before retrying (to a total of 5 times):
import requests
from urllib3.util.retry import Retry
from requests.adapters import HTTPAdapter
s = requests.Session()
retries = Retry(total=5,
...
再说WCF Data Contract KnownTypeAttribute - 更多技术 - 清泛网 - 专注IT技能提升
...为了DataContract类型定义的简约和独立性，我们不妨将这个函数摘出来，或许更有利于程序结构：
[ServiceContract]
[ServiceKnownType("GetKnownTypes", typeof(KnownTypesProvider))]
public interface IService1
{
......
}
static class KnownTypesProvider
{...
再说WCF Data Contract KnownTypeAttribute - 更多技术 - 清泛网 - 专注IT技能提升
...为了DataContract类型定义的简约和独立性，我们不妨将这个函数摘出来，或许更有利于程序结构：
[ServiceContract]
[ServiceKnownType("GetKnownTypes", typeof(KnownTypesProvider))]
public interface IService1
{
......
}
static class KnownTypesProvider
{...
再说WCF Data Contract KnownTypeAttribute - 更多技术 - 清泛网 - 专注IT技能提升
...为了DataContract类型定义的简约和独立性，我们不妨将这个函数摘出来，或许更有利于程序结构：
[ServiceContract]
[ServiceKnownType("GetKnownTypes", typeof(KnownTypesProvider))]
public interface IService1
{
......
}
static class KnownTypesProvider
{...
再说WCF Data Contract KnownTypeAttribute - 更多技术 - 清泛网 - 专注IT技能提升
...为了DataContract类型定义的简约和独立性，我们不妨将这个函数摘出来，或许更有利于程序结构：
[ServiceContract]
[ServiceKnownType("GetKnownTypes", typeof(KnownTypesProvider))]
public interface IService1
{
......
}
static class KnownTypesProvider
{...