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App Inventor 2 物联网入门的两个方向：BLE直连硬件 vs MQTT云端通信，你的...
...按下开关，延时几乎不可感知。
MQTT方案：硬件端需用ESP8266/ESP32连接WiFi，订阅"home/light/command"主题；手机App同样连接同一MQTT服务器（如公共Broker或自建EMQX），向该主题发布消息。灯的状态变化通过"home/light/status&quo...
GDB corrupted stack frame - How to debug?
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Those bogus adresses (0x00000002 and the like) are actually PC values, not SP values. Now, when you get this kind of SEGV, with a bogus (very small) PC address, 99% of the time it's due to calling through a bogus function pointer. Note that virtual calls in C++ are implemented ...
Set a default parameter value for a JavaScript function
...and then you can call it as a = defaultFor(a, 42);
– Camilo Martin
Sep 2 '12 at 5:56
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How do I pass a variable by reference?
...he reference that you had to the outside variable.
– Cam Jackson
Sep 8 '11 at 23:50
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What is the closest thing Windows has to fork()?
I guess the question says it all.
13 Answers
13
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Is volatile expensive?
...Cookbook for Compiler Writers about the implementation of volatile, especially section "Interactions with Atomic Instructions" I assume that reading a volatile variable without updating it needs a LoadLoad or a LoadStore barrier. Further down the page I see that LoadLoad and LoadStore are effective...
jQuery .ready in a dynamically inserted iframe
We are using jQuery thickbox to dynamically display an iframe when someone clicks on a picture. In this iframe, we are using galleria a javascript library to display multiple pictures.
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Using jquery to get all checked checkboxes with a certain class name
I know I can get all checked checkboxes on a page using this:
16 Answers
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How to obtain a Thread id in Python?
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Using the logging module you can automatically add the current thread identifier in each log entry.
Just use one of these LogRecord mapping keys in your logger format string:
%(thread)d : Thread ID (if available).
%(threadName)s : Thread name (if available).
a...
Explain the concept of a stack frame in a nutshell
... stack is composed of 1 or many several stack frames. Each stack frame corresponds to a call to a function or procedure which has not yet terminated with a return.
To use a stack frame, a thread keeps two pointers, one is called the Stack Pointer (SP), and the other is called the Frame Pointer (FP...