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What is the difference between user and kernel modes in operating systems?
...inology).
Entered with the svc instruction (SuperVisor Call), previously known as swi before unified assembly, which is the instruction used to make Linux system calls. Hello world ARMv8 example:
hello.S
.text
.global _start
_start:
/* write */
mov x0, 1
ldr x1, =msg
ldr x2, =len
...
How can I reference a commit in an issue comment on GitHub?
...it with git log, it will show up on the lines with commit <SHA>. And if that doesn't work, it could be you did not do the git push origin master. Also, there is a bug in github, there must be at least one character after the <SHA> or it doesn't get detected. It can just be a newline or a...
How to check that an element is in a std::set?
...
this is specific for sets and maps. vectors, lists etc. don't have a find member function.
– wilhelmtell
Nov 9 '09 at 13:53
...
Windows下如何判断Win32 or x64？ - C/C++ - 清泛网 - 专注C/C++及内核技术
...不。在 Windows SDK 的 minwindef.h 下第 37 行有如下定义：
#ifndef WIN32
#define WIN32
#endif
即是说，只要包含了 Windows.h，那么 WIN32 常量是肯定定义了的，所以不能用于判断平台环境。但是如果在预处理定义里删掉 WIN32，又不包含 Wi...
GCC dump preprocessor defines
...touch foo.h; cpp -dM foo.h
will show all the predefined macros.
If you use -dM without the -E option,
-dM is interpreted as a synonym for -fdump-rtl-mach.
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windows异常处理 __try __except - C/C++ - 清泛网 - 专注C/C++及内核技术
...t exception_access_violation_filter(LPEXCEPTION_POINTERS p_exinfo)
{
if(p_exinfo->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION)
{
messagebox("access vialation exceptionn");
return EXCEPTION_EXECUTE_HANDLER ; //告诉except处理这个异常
}
el...
What is __declspec and when do I need to use it?
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This is a Microsoft specific extension to the C++ language which allows you to attribute a type or function with storage class information.
Documentation
__declspec (C++)
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PHP Get Site URL Protocol - http vs https
... current site url protocol but I don't have SSL and don't know how to test if it works under https. Can you tell me if this is correct?
...
How to apply a function to two columns of Pandas dataframe
...sing apply on the dataframe, which I am calling with axis = 1.
Note the difference is that instead of trying to pass two values to the function f, rewrite the function to accept a pandas Series object, and then index the Series to get the values needed.
In [49]: df
Out[49]:
0 ...
How to add a custom loglevel to Python's logging facility
...ebug level to be printed -- regardless of what the log level is set to. So if you make a new level number of 9, if you call setLevel(50), the lower level messages will erroneously be printed.
To prevent that from happening, you need another line inside the "debugv" function to check if the logg...