binding.py 文件源码

def init_static_locks(cls):
        with cls._lock_init_lock:
            cls._ensure_ffi_initialized()

            if not cls._lock_cb_handle:
                wrapper = ffi_callback(
                    "void(int, int, const char *, int)",
                    name="Cryptography_locking_cb",
                )
                cls._lock_cb_handle = wrapper(cls._lock_cb)

            # Use Python's implementation if available, importing _ssl triggers
            # the setup for this.
            __import__("_ssl")

            if cls.lib.CRYPTO_get_locking_callback() != cls.ffi.NULL:
                return

            # If nothing else has setup a locking callback already, we set up
            # our own
            num_locks = cls.lib.CRYPTO_num_locks()
            cls._locks = [threading.Lock() for n in range(num_locks)]

            cls.lib.CRYPTO_set_locking_callback(cls._lock_cb_handle)