rsgc 1.1.0

Concurrent GC library for Rust
Documentation 
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cfg_if::cfg_if! {
    if #[cfg(any(target_os = "macos", target_os = "ios", target_os = "watchos", target_os = "tvos"))] {
        #[cfg(target_arch="aarch64")]
        pub type PlatformRegisters = libc::__darwin_arm_thread_state64;

        #[cfg(target_arch="x86_64")]
        pub type PlatformRegisters = libc::__darwin_x86_thread_state64_t;

        #[cfg(target_arch="x86")]
        pub type PlatformRegisters = libc::__darwin_x86_thread_state32_t;

        #[cfg(target_arch="arm")]
        pub type PlatformRegisters = libc::__darwin_arm_thread_state;

        pub fn registers_from_ucontext(ucontext: *mut libc::ucontext_t) -> *mut PlatformRegisters {
            unsafe {
                &mut (*(*ucontext).uc_mcontext).__ss as *mut PlatformRegisters
            }
        }

    } else if #[cfg(windows)] {
        pub type PlatformRegisters = winapi::um::winnt::CONTEXT;

        pub fn registers_from_ucontext(ucontext: *mut winapi::um::winnt::CONTEXT) -> *mut PlatformRegisters {
            ucontext
        }
    } else {
        pub struct PlatformRegisters {
            pub machine_context: libc::mcontext_t
        }

        pub fn registers_from_ucontext(ucontext: *mut libc::ucontext_t) -> *mut PlatformRegisters {
            unsafe {
                cfg_if::cfg_if! {
                    if #[cfg(target_os="openbsd")] {
                        ucontext.cast()
                    } else {
                        &mut (*ucontext).uc_mcontext as *mut libc::mcontext_t as *mut PlatformRegisters
                    }
                }

            }
        }
    }
}