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What is the _REENTRANT flag?


What is the _REENTRANT flag?

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What is the _REENTRANT flag?
Tag : cpp , By : Goeran
Date : January 02 2021, 06:48 AM


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Is it required for me to add a _REENTRANT macro during compile time to make my errno thread safe?


Tag : c , By : user183289
Date : March 29 2020, 07:55 AM
I wish this helpful for you In practice, _REENTRANT is legacy junk from a time when threads were considered an extension hacked on top of existing implementations, and the default behavior of the standard library was not thread-safe. It should not be needed on modern implementations, and it was never standard. (Note that it's also a misnomer, since reentrant and thread-safe have radically different meanings.)
In theory, POSIX requires you to query and use the following configuration options via getconf if you're compiling a threaded program:

"for (bool flag = true; flag; flag = false) { ... }" - is this normal?


Tag : chash , By : Mark
Date : March 29 2020, 07:55 AM
like below fixes the issue I had previously assumed you were looking at original source code, but from your comments it sounds like you're looking at Reflector's reconstituted C# based on the MSIL. It's important to understand that this does not necessarily bear a close resemblance to the original code as written.
At the MSIL level, there is no such thing as a for loop or a while loop. There are just conditional branch instructions. (See here: http://weblogs.asp.net/kennykerr/archive/2004/09/23/introduction-to-msil-part-6-common-language-constructs.aspx ) Any tool trying to reconstitute C# must make a number of guesses for how the code was originally structured. It seems probable that this wasn't originally written as a for loop, but that Reflector detected that the IL could have been generated by a for loop, and its heuristics made a bad guess that it should be a for loop and not something else.

Carry Flag, Auxiliary Flag and Overflow Flag in Assembly


Tag : assembly , By : user185144
Date : March 29 2020, 07:55 AM
will help you Carry Flag is a flag set when:
a) two unsigned numbers were added and the result is larger than "capacity" of register where it is saved. Ex: we wanna add two 8 bit numbers and save result in 8 bit register. In your example: 255 + 9 = 264 which is more that 8 bit register can store. So the value "8" will be saved there (264 & 255 = 8) and CF flag will be set.

How to determine when zero flag, sign flag, overflow flag and carry flag are set?


Tag : assembly , By : fukas78
Date : March 29 2020, 07:55 AM
may help you .
The answer here is 252 not a negative number. So why is the sign flag set?

UDUNITS-2 ---> clang: error: no such file or directory: '_REENTRANT'


Tag : xcode , By : Killercode
Date : March 29 2020, 07:55 AM
Hope this helps I am trying to install UDUNITS-2 package for the graphical visual browser: ncview. Can anyone help me understand the following error message: , The problem was solved by implementing the code:
brew install -s ncview
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