diff -ur cpython-5e87dd117f74/Include/pystate.h cpython/Include/pystate.h
--- cpython-5e87dd117f74/Include/pystate.h	2011-04-12 00:57:21.000000000 +0000
+++ cpython/Include/pystate.h	2011-04-27 15:53:09.000000000 +0000
@@ -131,6 +131,7 @@
 PyAPI_FUNC(void) PyThreadState_Delete(PyThreadState *);
 #ifdef WITH_THREAD
 PyAPI_FUNC(void) PyThreadState_DeleteCurrent(void);
+PyAPI_FUNC(void) _PyGILState_Reinit(void);
 #endif
 
 PyAPI_FUNC(PyThreadState *) PyThreadState_Get(void);
diff -ur cpython-5e87dd117f74/Modules/signalmodule.c cpython/Modules/signalmodule.c
--- cpython-5e87dd117f74/Modules/signalmodule.c	2011-04-12 00:57:21.000000000 +0000
+++ cpython/Modules/signalmodule.c	2011-04-27 15:54:55.000000000 +0000
@@ -985,6 +985,7 @@
 PyOS_AfterFork(void)
 {
 #ifdef WITH_THREAD
+    _PyGILState_Reinit();
     PyEval_ReInitThreads();
     main_thread = PyThread_get_thread_ident();
     main_pid = getpid();
diff -ur cpython-5e87dd117f74/Python/pystate.c cpython/Python/pystate.c
--- cpython-5e87dd117f74/Python/pystate.c	2011-04-12 00:57:21.000000000 +0000
+++ cpython/Python/pystate.c	2011-04-27 15:51:46.000000000 +0000
@@ -585,6 +585,23 @@
     autoInterpreterState = NULL;
 }
 
+/* Reset the TLS key - called by PyOS_AfterFork.
+ * This should not be necessary, but some - buggy - pthread implementations
+ * don't flush TLS on fork, see issue #10517.
+ */
+void
+_PyGILState_Reinit(void)
+{
+    PyThreadState *tstate = PyGILState_GetThisThreadState();
+    PyThread_delete_key(autoTLSkey);
+    if ((autoTLSkey = PyThread_create_key()) == -1)
+        Py_FatalError("Could not allocate TLS entry");
+
+    /* re-associate the current thread state with the new key */
+    if (PyThread_set_key_value(autoTLSkey, (void *)tstate) < 0)
+        Py_FatalError("Couldn't create autoTLSkey mapping");
+}
+
 /* When a thread state is created for a thread by some mechanism other than
    PyGILState_Ensure, it's important that the GILState machinery knows about
    it so it doesn't try to create another thread state for the thread (this is