Rust bindings

[luizirber]

Hi, thanks for the great library!

I started two crates for wrapping the C FFI for using in Rust, one is the unsafe low-level bindings (bitmagic-sys) and another a safe/high-level/closer to Rust usage, based on the API of fixedbitset (bitmagic), but I intend to expose more methods over time.

Overall it is already working, after I commented out a line in cmake. The big problem I'm having is that if I run tests with more than 1 thread, the C++ exception emulation with longjmp/setjmp creates memory corruption. I'm looking into that to see what is going on...

I didn't register the crates in crates.io because I wanted to check if you first to see if that's OK, and I would also like to try to use the crate a bit more before registering anyway.

[tlk00]

longjmp crash is an unfortunate bad news for threading programs..
I experimented with Java/JNI integration and it worked for me.

Did you figure out why it is happening in your case?
setjmp-longjmp is supposed to be happening within one thread, per-thread (if things work as planned)

[tlk00]

Oh, never mind, i see what is going on

static jmp_buf ex_buf__;

is one shared point for all threads, thus needs to be communicated via TLS.
It is indeed seems to be a bug.

[luizirber]

Oh, never mind, i see what is going on

static jmp_buf ex_buf__;

making it

• thread_local jmp_buf ex_buf__; fixes my problem, but that requires C++11.
• __thread jmp_buf ex_buf__; also works, but depends on GCC or Clang.
• __declspec(thread) jmp_buf ex_buf__; seems to be the Windows idiom

(all options from https://en.wikipedia.org/wiki/Thread-local_storage#C_and_C++)

[tlk00]

Yep, that is what i had in mind.
Please feel free to submit a patch (or let me know I would do it).

Thank you again for bringing it to attention!

[tlk00]

Fix propagated, closing.