Enable locking in py11.

1 files changed, 15 insertions, 2 deletions

diff --git a/py11/__init__.py b/py11/__init__.py
index ab187f7..bb4813f 100644
--- a/py11/__init__.py
+++ b/py11/__init__.py
@@ -35,8 +35,21 @@ class PKCS11 (object):
     self.so.C_GetInfo(byref(info))
     return info.cryptokiVersion
 
-  def C_Initialize(self):
-    self.so.C_Initialize(None)
+  # http://stackoverflow.com/questions/15786635/using-ctypes-to-write-callbacks-that-pass-in-pointer-to-pointer-parameters-to-be
+  # suggests that it should be straightforward to write callback
+  # functions to implement the mutex semantics, and we get the
+  # CK_CREATEMUTEX call, but we dump core on the CK_LOCKMUTEX call.
+  # Specifying CKF_OS_LOCKING_OK does work, and is sufficient for most
+  # purposes, so leaving the callbacks out of the API for now.
+
+  def C_Initialize(self, flags = 0):
+    if flags == 0:
+      self.so.C_Initialize(None)
+    else:
+      init_arg = CK_C_INITIALIZE_ARGS(cast(None, CK_CREATEMUTEX), cast(None, CK_DESTROYMUTEX),
+                                      cast(None, CK_LOCKMUTEX),   cast(None, CK_UNLOCKMUTEX),
+                                      flags, None)
+      self.so.C_Initialize(cast(byref(init_arg), CK_VOID_PTR))
 
   def C_Finalize(self):
     self.so.C_Finalize(None)