.

bigfile/_file_zodb.pyx

@@ -86,6 +86,7 @@ cdef public class _ZBigFile(BigFile) [object _ZBigFile, type _ZBigFile_Type]:
     def loadblk(self, blk, buf):    return self.zself.loadblk(blk, buf)
     def storeblk(self, blk, buf):   return self.zself.storeblk(blk, buf)
 
+
     # blkmmapper is pycapsule with virtmem mmap functions for _ZBigFile.
     # The functions rely on .wfileh being initialized by .fileh_open()
     blkmmapper = PyCapsule_New(<void*>&ZBigFile_mmap_ops, "wendelin.bigfile.IBlkMMapper", NULL)
@@ -119,7 +120,7 @@ cdef public class _ZBigFile(BigFile) [object _ZBigFile, type _ZBigFile_Type]:
 # XXX move -> .py ?
 cdef wcfs.PyConn pywconnOf(zconn):
     assert isinstance(zconn, ZConnection)
-    assert zconn.opened     # XXX needed
+    assert zconn.opened     # XXX needed?
 
     # XXX locking
     wconn = getattr(zconn, '_wcfs_wconn', None)
@@ -149,7 +150,7 @@ class ZSync:
     # .wconn
 
     def __init__(zsync, zconn, wconn):
-        print('ZSync %r %r' % (zconn, wconn))
+        #print('ZSync %r %r' % (zconn, wconn))
         assert zconn.open
         zsync.zconn = zconn     # XXX -> weakref
         zsync.wconn = wconn
@@ -161,11 +162,11 @@ class ZSync:
         # tm.commit()   # zconn.at updated again
         zconn.onResyncCallback(zsync)
 
+    # TODO zconn dealloc -> wconn.close
+
     # DB resyncs .zconn onto new database view.
     # -> resync .wconn to updated database view of ZODB connection.
     def on_connection_resync(zsync):
         #print('\nZZZSync.resync %r %r' % (zsync.zconn, zsync.wconn))
         #import traceback; traceback.print_stack()
         zsync.wconn.resync(zconn_at(zsync.zconn))
-
-    # TODO zconn dealloc -> wconn.close

include/wendelin/compat_py2.h

@@ -2,7 +2,7 @@
 #define _WENDELIN_COMPAT_PY2_H
 
 /* Wendelin. Python2 compatibility
- * Copyright (C) 2014-2019  Nexedi SA and Contributors.
+ * Copyright (C) 2014-2020  Nexedi SA and Contributors.
  *                          Kirill Smelkov <kirr@nexedi.com>
  *
  * This program is free software: you can Use, Study, Modify and Redistribute
@@ -102,6 +102,15 @@ static inline PyThreadState * _PyThreadState_UncheckedGet(void)
 # error "You are using CPython 3.5.X series. Upgrade your CPython to >= 3.5.2 to get _PyThreadState_UncheckedGet() support."
 #endif
 
+/* determine if current thread holds the GIL
+ * https://stackoverflow.com/a/25666624/9456786 */
+#if PY_MAJOR_VERSION < 3
+static inline int PyGILState_Check(void)
+{
+    // XXX do we really need it?
+    abort();
+}
+#endif
 
 #ifdef __cplusplus
 }