[3.6] bpo-30395 _PyGILState_Reinit deadlock fix (GH-1734) (#1740)
head_lock could be held by another thread when fork happened. We should
reset it to avoid deadlock.
(cherry picked from commit f82c951d1c5416f3550d544e50ff5662d3836e73)
diff --git a/Misc/ACKS b/Misc/ACKS
index 7109ccb..b8bac24 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -552,6 +552,7 @@
Daniel Andrade Groppe
Dag Gruneau
Filip Gruszczyński
+Andrii Grynenko
Grzegorz Grzywacz
Thomas Guettler
Yuyang Guo
diff --git a/Python/pystate.c b/Python/pystate.c
index 65c244e..ccb0092 100644
--- a/Python/pystate.c
+++ b/Python/pystate.c
@@ -743,6 +743,10 @@
void
_PyGILState_Reinit(void)
{
+#ifdef WITH_THREAD
+ head_mutex = NULL;
+ HEAD_INIT();
+#endif
PyThreadState *tstate = PyGILState_GetThisThreadState();
PyThread_delete_key(autoTLSkey);
if ((autoTLSkey = PyThread_create_key()) == -1)