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use types::{CallbackPtr, c_char, c_int, c_void, Value};

extern "C" {
    pub fn ruby_init();
    pub fn rb_block_proc() -> Value;
    pub fn rb_raise(exception: Value, message: *const c_char);
    pub fn rb_require(name: *const c_char) -> Value;
    pub fn rb_thread_call_without_gvl(func: CallbackPtr,
                                      args: *const c_void,
                                      unblock_func: CallbackPtr,
                                      unblock_args: *const c_void)
                                      -> *mut c_void;
    pub fn rb_thread_call_without_gvl2(func: CallbackPtr,
                                       args: *const c_void,
                                       unblock_func: CallbackPtr,
                                       unblock_args: *const c_void)
                                       -> *mut c_void;
    pub fn rb_thread_call_with_gvl(func: CallbackPtr, args: *const c_void) -> *mut c_void;
    pub fn rb_protect(func: CallbackPtr, args: *const c_void, state: *mut c_int) -> Value;
}