Questions tagged [cextension]
12 questions
8
votes
2 answers
How is writing a C interface easier in Ruby than Perl?
According to the official ruby About page it's easier to extend Ruby with C than Perl. I'm not a (perl) XS guy, but I find it dirt simple to write something quick and simple with Inline::C, so why is it easier in Ruby?
Writing C extensions in Ruby…
Evan Carroll
- 78,363
- 46
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7
votes
3 answers
How to avoid gcc warning in Python C extension when using Py_BEGIN_ALLOW_THREADS
The simplest way to manipulate the GIL in Python C extensions is to use the macros provided:
my_awesome_C_function()
{
blah;
Py_BEGIN_ALLOW_THREADS
// do stuff that doesn't need the GIL
if (should_i_call_back) {
…
Ned Batchelder
- 364,293
- 75
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- 662
3
votes
1 answer
Updating C extension for Ruby 1.9
I'm updating a fairly old C extension bound to a ruby gem that I didn't write. Currently, when I execute the script that will use the C extension, I get this error:
symbol lookup error: /path/to/lib.so: undefined symbol: rb_str2cstr
There was also…
Eugene
- 4,829
- 1
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3
votes
1 answer
Dynamically build and return a Python list in a C Python extension
I'm writing a Python extension in C, and I'm trying to figure out how to dynamically build and return a Python list using my extension. I know how to build a list of predetermined size using Py_BuildValue. Is there a way to create a list with…
fuad
- 4,265
- 9
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2
votes
2 answers
Storing data in a ruby C extension - terrible idea or not?
My team is working on an MMO server in Ruby, and we opted to start moving computationally intensive operations into a C extension. As part of that effort, we moved the actual data storage into C (using Data_Get_Struct and all that). So, for example,…
Mike Laurence
- 447
- 3
- 13
2
votes
1 answer
Can't get C extension CMySQLConnection in Python
I'm using Windows and Pycharm to connect to MySQL.
The codebase requires me to pass a CMySQLConnection to a function, but when I check what I'm creating, it's a MySQLConnection instead (no C).
This exact same code worked on a different machine (that…
Daniel
- 31
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1
vote
1 answer
Python CExtension gives ModuleNotFoundError
I am using Python 3 with Anaconda Spyder on CentOS 7. I am trying to get the Python CExtension working by following this video.
https://www.youtube.com/watch?v=a65JdvOaygM
I have all of my files in /home/peter/pythonCExtensions which is in the…
OtagoHarbour
- 3,969
- 6
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- 81
1
vote
0 answers
Python - Compiling C Extensions at Runtime
I have a C program written to do some heavy numerical work, and have been thinking about the best way to implement a Python interface to the code.
The difficulty is that my C application must be recompiled in order to change some parameters,…
Geoff Ryan
- 353
- 1
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- 7
0
votes
0 answers
How can I enable my C extension on VScode
I’ve downloaded .C file in my VSCode and I’ve installed it but it refused open
I was expecting it to open but it to run but it’s showing platform package installation failed every time I install it and try to run a program
0
votes
0 answers
Problems importing Pandas
I installed pandas via anaconda and it seemed to work. However, when I want to import pandas I get the following error:
C extension: hashtable not built.
If you want to import pandas from the source directory, you may need to run
'python setup.py…
Leni
- 1
- 2
0
votes
1 answer
Python cassandra-driver: The C extension needed to use libev was not found
I have Cassandra python driver version 2.5.1 installed with all required dependencies that is libev4, libev-dev, gcc, python-dev. However I am getting following error while importing LibevConnection
"The C extension needed to use libev was not…
samarth
- 3,866
- 7
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0
votes
1 answer
How to invoke this function?
Below sample i saw in Apple document, confused about how to call qsort_b fucntion? What are the parameters need to pass as const void *l & const void *r.
char *myCharacters[3] = { "TomJohn", "George", "Charles Condomine" };
qsort_b(myCharacters, 3,…
Anand Tugaon
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- 1