script/_Lib/epics/ca.py

@@ -0,0 +1,49 @@
+#!/usr/bin/env python
+## @package ca: EPICS-CA interface module for Python.
+"""CA modlue : EPICS-CA interface module for Python.
+This module provide a  version of EPICS-CA and Python interface.
+It users C module _ca. _ca module basically maps C-API in EPICS ca library into python. Interface between ca.py and _ca module is  subject for change. You should not depend on it. API in ca.py will be preserved in future releases as much as possible.
+Author: Noboru Yamamoto, KEK, JAPAN. -2007.
+$Revision: 1.4 $
+"""
+
+__version__ = "$Revision: 1.4 $"
+# $Source: /cvs/G/EPICS/extensions/src/PythonCA/src/ca.py,v $
+
+import time,gc,sys,atexit
+if sys.hexversion >= 0x03000000:
+  import _thread as thread
+else:
+  import thread
+
+# autGIL is not compatible with Tkinter and wx. So code was removed
+
+# force thread module to call PyEval_InitThread in it.
+__foo_lock=thread.allocate_lock()
+def __foo():
+    """
+    test function foo
+
+    This function is used to ensure thread module is initialized before
+    loading _ca module.
+    """
+    global __foo_lock
+    __foo_lock.release()
+    thread.exit_thread()
+
+# See Python/Include/ceval.h
+__foo_lock.acquire()
+thread.start_new_thread(__foo,()) # __foo release lock
+__foo_lock.acquire() # make sure threading is activated
+
+import _ca
+# version from _ca314.cpp
+version=_ca.version
+revision=_ca.release
+
+# some constants for EPICS channel Access library
+from cadefs import *
+from caError import *
+
+# for FNAL version you need to provide _ca_fnal.py and import every thin from them
+from _ca_fnal import *