pthread_cleanup_push analog
lazarus / 66-Unix

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DevilDevil · 2020-06-02 17:25

I am developing a memory manager. The core is in C (Clang), and the
API binding will be in the final language. Now it’s Delphi/FreePascal,
then there will be headers for C/C++ companion compilers.

There is one important feature. At some moment, my function is called
from an arbitrary thread created by someone in some language. At this
moment, I need to register the callback thread to complete in order to
properly clean it.

On Windows, I do this with fiber. I googled POSIX, they say there is
pthread_cleanup_push.

But firstly, we do not have this macro in the headers. Secondly,
apparently, he is obliged to work in tandem with pthread_cleanup_pop,
i.e. is temporary: https://godbolt.org/z/FB564h

All I found are two functions:
https://www.man7.org/linux/man-
pages/man3/pthread_setcancelstate.3.html
https://www.man7.org/linux/man-pages/man3/pthread_setcanceltype.3.html

But nowhere is it visible how you can specify a callback
Please tell me what to do

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marcov · 2020-06-02 20:35

Look at the headers of the multiple supported *nixes.

Manpages are often simplified.

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DevilDevil · 2020-06-02 21:08

Quote from: marcov on June 02, 2020, 10:35:50 pmLook at the headers of
the multiple supported *nixes.

It is too difficult for me:
https://code.woboq.org/gcc/include/pthread.h.html#574

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DevilDevil · 2020-06-04 09:06

I heard that FPC can finalize threadvar.
I need similar functionality. But in the source I did not find the
corresponding code. Can we attract FPC developers?

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PascalDragon · 2020-06-04 09:21

All threadvar related functionality for pthreads is located inside
rtl/unix/cthreads.pp.