diff -ur Python-2.6.4/Modules/posixmodule.c Python-2.6.4.patched/Modules/posixmodule.c
--- Python-2.6.4/Modules/posixmodule.c	2009-09-16 16:06:36.000000000 -0400
+++ Python-2.6.4.patched/Modules/posixmodule.c	2010-01-22 10:00:18.000000000 -0500
@@ -3634,11 +3634,12 @@
 	int result;
 	_PyImport_AcquireLock();
 	pid = fork1();
+	if (pid == 0)
+		PyOS_AfterFork();
+
 	result = _PyImport_ReleaseLock();
 	if (pid == -1)
 		return posix_error();
-	if (pid == 0)
-		PyOS_AfterFork();
 	if (result < 0) {
 		/* Don't clobber the OSError if the fork failed. */
 		PyErr_SetString(PyExc_RuntimeError,
@@ -3663,11 +3664,12 @@
 	int result;
 	_PyImport_AcquireLock();
 	pid = fork();
+	if (pid == 0)
+		PyOS_AfterFork();
+
 	result = _PyImport_ReleaseLock();
 	if (pid == -1)
 		return posix_error();
-	if (pid == 0)
-		PyOS_AfterFork();
 	if (result < 0) {
 		/* Don't clobber the OSError if the fork failed. */
 		PyErr_SetString(PyExc_RuntimeError,
@@ -3781,11 +3783,12 @@
 
 	_PyImport_AcquireLock();
 	pid = forkpty(&master_fd, NULL, NULL, NULL);
+	if (pid == 0)
+		PyOS_AfterFork();
+
 	result = _PyImport_ReleaseLock();
 	if (pid == -1)
 		return posix_error();
-	if (pid == 0)
-		PyOS_AfterFork();
 	if (result < 0) {
 		/* Don't clobber the OSError if the fork failed. */
 		PyErr_SetString(PyExc_RuntimeError,
diff -ur Python-2.6.4/Python/import.c Python-2.6.4.patched/Python/import.c
--- Python-2.6.4/Python/import.c	2009-09-16 16:06:36.000000000 -0400
+++ Python-2.6.4.patched/Python/import.c	2010-01-26 07:03:14.000000000 -0500
@@ -303,10 +303,9 @@
 void
 _PyImport_ReInitLock(void)
 {
-#ifdef _AIX
 	if (import_lock != NULL)
 		import_lock = PyThread_allocate_lock();
-#endif
+        import_lock_thread = PyThread_get_thread_ident();
 }
 
 #endif