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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++ ...
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...
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...
AI2 Keep Awake
...ry life. This function gradually turns everything off (display, CPU, WiFi, etc.) when no app is being used. With the extension described here, you can ensure that the CPU is not turned off and the app remains active for a long period of time. A lot of useful background information can be found i...
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;
...
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
...
MySQL integer field is returned as string in PHP
...rn $data;
}
Example usage:
$dbconn = mysqli_connect('localhost','user','passwd','tablename');
$rs = mysqli_query($dbconn, "SELECT * FROM Matches");
$matches = cast_query_results($rs);
// $matches is now a assoc array of rows properly casted to ints/floats/strings
...
How does a debugger work?
...rface Access SDK.
If you are debugging a managed environment (.NET, Java, etc.) the process will typically look similar, but the details are different, as the virtual machine environment provides the debug API rather than the underlying OS.
...