fix cffi life cycle

Author: wanglusheng

axengine/_axclrt.py

@@ -96,6 +96,8 @@ def __init__(
         super().__init__()
 
         self._device_index = 0
+        self._io = None
+        self._model_id = None
 
         if provider_options is not None and "device_id" in provider_options[0]:
             self._device_index = provider_options[0].get("device_id", 0)
@@ -214,12 +216,12 @@ def _unload(self):
             dev_size = axclrt_cffi.new("uint64_t *")
             dev_prt = axclrt_cffi.new("void **")
             for i in range(axclrt_lib.axclrtEngineGetNumInputs(self._info[0])):
-                axclrt_lib.axclrtEngineGetInputBufferByIndex(self._io, i, dev_prt, dev_size)
+                axclrt_lib.axclrtEngineGetInputBufferByIndex(self._io[0], i, dev_prt, dev_size)
                 axclrt_lib.axclrtFree(dev_prt[0])
             for i in range(axclrt_lib.axclrtEngineGetNumOutputs(self._info[0])):
-                axclrt_lib.axclrtEngineGetOutputBufferByIndex(self._io, i, dev_prt, dev_size)
+                axclrt_lib.axclrtEngineGetOutputBufferByIndex(self._io[0], i, dev_prt, dev_size)
                 axclrt_lib.axclrtFree(dev_prt[0])
-            axclrt_lib.axclrtEngineDestroyIO(self._io)
+            axclrt_lib.axclrtEngineDestroyIO(self._io[0])
             self._io = None
         if self._model_id[0] is not None and self._model_id[0] != 0:
             axclrt_lib.axclrtEngineUnload(self._model_id[0])
@@ -322,7 +324,7 @@ def _prepare_io(self):
             ret = axclrt_lib.axclrtEngineSetOutputBufferByIndex(_io[0], i, dev_ptr[0], max_size)
             if 0 != ret:
                 raise RuntimeError(f"axclrtEngineSetOutputBufferByIndex failed 0x{ret:08x} for output {i}.")
-        return _io[0]
+        return _io
 
     def run(
             self,
@@ -353,21 +355,21 @@ def run(
                     if not (npy.flags.c_contiguous or npy.flags.f_contiguous):
                         npy = np.ascontiguousarray(npy)
                     npy_ptr = axclrt_cffi.cast("void *", npy.ctypes.data)
-                    ret = axclrt_lib.axclrtEngineGetInputBufferByIndex(self._io, i, dev_prt, dev_size)
+                    ret = axclrt_lib.axclrtEngineGetInputBufferByIndex(self._io[0], i, dev_prt, dev_size)
                     if 0 != ret:
                         raise RuntimeError(f"axclrtEngineGetInputBufferByIndex failed for input {i}.")
                     ret = axclrt_lib.axclrtMemcpy(dev_prt[0], npy_ptr, npy.nbytes, axclrt_lib.AXCL_MEMCPY_HOST_TO_DEVICE)
                     if 0 != ret:
                         raise RuntimeError(f"axclrtMemcpy failed for input {i}.")
 
         # execute model
-        ret = axclrt_lib.axclrtEngineExecute(self._model_id[0], self._context_id[0], 0, self._io)
+        ret = axclrt_lib.axclrtEngineExecute(self._model_id[0], self._context_id[0], 0, self._io[0])
 
         # get output
         outputs = []
         if 0 == ret:
             for i in range(len(self.get_outputs())):
-                ret = axclrt_lib.axclrtEngineGetOutputBufferByIndex(self._io, i, dev_prt, dev_size)
+                ret = axclrt_lib.axclrtEngineGetOutputBufferByIndex(self._io[0], i, dev_prt, dev_size)
                 if 0 != ret:
                     raise RuntimeError(f"axclrtEngineGetOutputBufferByIndex failed for output {i}.")
                 npy = np.zeros(self.get_outputs()[i].shape, dtype=self.get_outputs()[i].dtype)