大约有 236 项符合查询结果（耗时：0.0098秒） [XML]
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...
Is volatile expensive?
...R-133 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 eff...
GDB corrupted stack frame - How to debug?
...ff the stack. In 32-bit x86 code you just do:
(gdb) set $pc = *(void **)$esp
(gdb) set $esp = $esp + 4
With 64-bit x86 code you need
(gdb) set $pc = *(void **)$rsp
(gdb) set $rsp = $rsp + 8
Then, you should be able to do a bt and figure out where the code really is.
The other 1% of the time,...
Fastest hash for non-cryptographic uses?
... if you have the benefit/luxury of a newer Intel cpu, there is a crc32c assembly command that is...probably really fast (though isn't the traditional crc32 value). See also xxhash code.google.com/p/xxhash
– rogerdpack
Dec 2 '13 at 20:34
...
String literals: Where do they go?
...rt literals, I could see the compiler generating code such as movb $65, 8(%esp); movb $66, 9(%esp); movb $0, 10(%esp) for the string "AB", but the vast majority of the time, it will be in a non-code segment such as .data or .rodata or the like (depending on whether or not the target supports read-on...
How can one see content of stack with GDB?
...o
To read the memory at given addresses you should take a look at x
x/x $esp for hex x/d $esp for signed x/u $esp for unsigned etc. x uses the format syntax, you could also take a look at the current instruction via x/i $eip etc.
...
Is errno thread-safe?
...0: 55 push ebp
1: 89 e5 mov ebp,esp
3: 83 e4 f0 and esp,0xfffffff0
6: e8 fc ff ff ff call 7 <main+0x7> ; get address of errno in EAX
b: c7 00 00 00 00 00 mov DWORD PTR [eax],0x0 ; store 0 in errno
11: b8 00...
HTML-parser on Node.js [closed]
... processing HTML without overhead of creating DOM.
– esp
Apr 20 '13 at 18:19
@esp Thanks, Before I thought it was non-...
App Inventor 2 IoT 参考文档 · App Inventor 2 中文网
...题：经典蓝牙(SPP)，低功耗蓝牙(BLE)，WIFI，物联网，MQTT，ESP32，Ardruino等相关硬件控制方法。
【BLE中文文档】App Inventor 2 低功耗蓝牙 BlueToothLE 拓展
【科普】低功耗蓝牙(BLE) 和 经典蓝牙(SPP) 的区别
【BLE通用教程】App Inventor ...
BLE通信数据不能超过20字节？ - 创客硬件开发 - 清泛IT社区，为创新赋能！
...没问题，用AI2就截断了，只有20字符。
答复：
1-在 ESP32 代码中，我放置了这一行：BLEDevice::setMTU(192);
2- 在应用程序中，我将调用 Request MTU 放在 .Connected 块上，请求相同的 192 字节；
就我而言，当我必须发送< 23字节的...