class_docstr: The main top-level class that you instantiate once, or once per module.
  
  Example usage:
  
      ffi = FFI()
      ffi.cdef("""
          int printf(const char *, ...);
      """)
  
      C = ffi.dlopen(None)   # standard library
      -or-
      C = ffi.verify()  # use a C compiler: verify the decl above is right
  
      C.printf("hello, %s!\n", ffi.new("char[]", "world"))
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code: def _get_cached_btype(self, type):
      assert self._lock.acquire(False) is False
      # call me with the lock!
      try:
          BType = self._cached_btypes[type]
      except KeyError:
          finishlist = []
          BType = type.get_cached_btype(self, finishlist)
          for type in finishlist:
              type.finish_backend_type(self, finishlist)
      return BType
  
imports: import sys, types
  from .lock import allocate_lock
  from .error import CDefError
  from .None import model
label_desc: Use image node_id 23 for calling the FFI obj's underlying member method code with example usage: obj._get_cached_btype(type) and returns: BType