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How efficient is locking an unlocked mutex? What is the cost of a mutex?
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This depends on what you actually call "mutex", OS mode and etc.
At minimum it's a cost of an interlocked memory operation. It's a relatively heavy operation (compared to other primitive assembler commands).
However, that can be very much higher. If what you call "mutex" a kernel ob...
How many concurrent requests does a single Flask process receive?
...pends on the nature of your app, its environment, the hardware it runs on, etc. More details can be found on Gunicorn's design page and notes on how gevent works on its intro page.
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开源MQTT网关：EMQX vs Mosquitto - 创客硬件开发 - 清泛IT社区，为创新赋能！
...底层传输协议 QUIC 的支持，以解决复杂网络环境下的通信问题，提升整体吞吐量和移动连接的稳定性。此外，EMQX 也扩展支持 MQTT-SN、CoAP、LwM2M、STOMP 以及其他协议扩展。安全性安全性对于物联网设备连接以及设备之间、设备与...
When to use PNG or JPG in iPhone development?
...fect" (e.g. small icons) or as a part of a composited transparent overlay, etc.
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How does the ARM architecture differ from x86? [closed]
...se */
while on ARM shortest form might look like (without error checking etc.)
top:
ldrb r2, [r0, #1]! /* load a byte from address in r0 into r2, increment r0 after */
ldrb r3, [r1, #1]! /* load a byte from address in r1 into r3, increment r1 after */
subs r2, r3, r2 /* subtract r2 from r3 and...
Lock-free multi-threading is for real threading experts
... Most of the classic lock-free structures (lists, queues, concurrent maps, etc) had no spinning even for shared mutable structures, and practical existing implementations of the same in, for example, Java follow the same pattern (I'm not as familiar with what's available in native-compiled C or C++ ...
How are 3D games so efficient? [closed]
...on. Radiosity will also take into account more effects of bouncing lights, etc. but it is computationally expensive - it's a ray tracing technique.
This is just one example. There are hundreds of algorithms for real time computer graphics and they are essentially based on good approximations and ty...
中文网（自研/维护）拓展 · App Inventor 2 中文网
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方法
RandomNumCode(length)
返回一个指定位数随机数字码。
SendSms(phoneNumber,signName,templateCode,templateParam)
发送短信。参数：手机号，签名名称，模板CODE，模板参数JSON
ClientSocketAI2Ext
Simple Cl...
How to organize a node app that uses sequelize?
...dels/2"]; // 1 to n paths can be specified here
orm.connect(db, user, passwd, options); // initialize the sequelize connection and models
Then you can access the models and sequelize like so:
var orm = require('sequelize-connect');
var sequelize = orm.sequelize;
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How to write a cron that will run a script every day at midnight?
.../cron.d/myapp-cron
# use /bin/bash to run commands, no matter what /etc/passwd says
SHELL=/bin/bash
# Execute a nightly (11:00pm) cron job to scrub application records
00 23 * * * someuser /opt/myapp/bin/scrubrecords.php
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