I am completely new to C and I just wanted to see if someone can help me with making a C function available to ccall. As a MWE I have // example.c file #include <stddef.h> void radix_sort(char **strings) { const size_t len = sizeof(strings) / sizeof(char *); strings[0] = strings[len]; return; }…

Got a bit further by installing this http://mingw-w64.org/doku.php/download and making CLion use the binaries in the installed directories!

You seem to be having trouble creating a .dll more than accessing it with Julia. Your fastest path to solving this may be a forum devoted to the C varient/compiler that you are using. I’m not overly familiar with the gcc compiler/linker but here is some info for you: Producing a .dll as against …

After many trial and error I figured out a way to do this reliably now. I will blog about it soon so I don’t forget myself.

So I can defined a function charstarstar that converts Julia’s representation of the String vector as C’s represenation by computing the start of the pointer location. Now it’s a just a question of efficiency, which I will soon. Thanks for the help and illuminating examples! x = ["ba","cd"] charsta…

[image] xiaodai: is not a valid Win32 Application This normally happens when a dll has dependencies that are not in the path that Julia knows of. Some versions of MinGW add a dependency to a mingw’s internal lib (don’t recall which) like the cygwin1.dll introduced when compiling with gcc in C…

charstarstar.(1:2) will create new vector. So your radix_sort will sort something unnamed and temporary. When I show address arithmetic in Julia I didn’t mean that it has to happen there. I would rather try to prepare some example (Christmas present :wink: ) for you: We could sort 100 millions of …

[image] Liso: charstarstar.(1:2) will create new vector. So your radix_sort will sort something unnamed and temporary. yeah i realised after sorting in c but in Julia the string didn’t change. The radixsort implementation doesnt use charstarstar.

[image] Liso: const Clib = “strqsort” # tempname() # make a temporary file good example … const Clib = "./strqsort" worked better for me on Linux

[image] Liso: @btime str_qsort(svec1) should the above be @btime str_qsort($svec1) instead? As svec1 gets modified after first run. Also str_qsort should be called str_qsort!. Also on my computer that sort takes 48 seconds but FastGroupBy’s radixsort! only took 19~29 seconds. const M=100_000…

[image] xiaodai: should the above be @btime str_qsort($svec1) instead? As svec1 gets modified after first run. Also str_qsort should be called str_qsort!. Also on my computer that sort takes 48 seconds but FastGroupBy’s radixsort! only took 19~29 seconds. Thanks! :slight_smile: I didn’t know …

How to make a C function compiled by myself available to `ccall`?

General Usage

xiaodai December 30, 2017, 2:28am 39

Just wrote a simple guide for Windows users

https://www.codementor.io/zhuojiadai/making-compiling-c-functions-for-use-in-julia-on-windows-f9lwa5i43

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How to make a C function compiled by myself available to `ccall`?

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