Add function for manually writing marker file

[OoJJBoO]

Add likwid_writeMarkerFile function to address the issue described in #583.

[TomTheBear]

Looks good, thanks for your work on the comments.

I found a small error in the F90 interface. The function in likwid_f90_interface.c has to have an underscore in the end: likwid_writemarkerfile_.

[OoJJBoO]

Updated. Looking at the other functions in the same file, I guess I should probably also use the way of passing in the string argument's length and copying it first before passing it to the likwid_writeMarkerFile function, right? Didn't notice that earlier for some reason.

[TomTheBear]

Yes, you should copy the string before providing it to the C functions.

[OoJJBoO]

Okay, I changed it. I also added the missing register macro in the Lua bindings.

[TomTheBear]

Sorry that I didn't check more thoroughly. I'm on a business trip (SC23) and read your code in between meetings. Next week I have more time to go through your changes.

[OoJJBoO]

No worries, take your time :)

[TomTheBear]

I looked at your code again and I realized that the new functions/macros do not follow the current naming scheme:

• likwid_writeMarkerFile -> likwid_markerWriteFile
• LIKWID_WRITE_MARKER_FILE -> LIKWID_MARKER_WRITE or LIKWID_MARKER_WRITE_FILE
• likwid_writemarkerfile_ -> likwid_markerwritefile_
• lua_likwid_writeMarkerFile -> lua_likwid_markerWriteFile

[OoJJBoO]

Ah, I see, you're right. I'll update them soon

[OoJJBoO]

I think my last commit should have updated all function names accordingly.

[TomTheBear]

Thanks, that should be all functions for the CPU MarkerAPI.

I should probably add similar functions for the Nvidia MarkerAPI and the ROCm MarkerAPI.