Close the discussion in SF bug 1069160.
diff --git a/Python/pystate.c b/Python/pystate.c
index 1825607..255cf7e 100644
--- a/Python/pystate.c
+++ b/Python/pystate.c
@@ -320,7 +320,7 @@
/* Asynchronously raise an exception in a thread.
Requested by Just van Rossum and Alex Martelli.
- To prevent naive misuse, you must write your own exception
+ To prevent naive misuse, you must write your own extension
to call this. Must be called with the GIL held.
Returns the number of tstates modified; if it returns a number
greater than one, you're in trouble, and you should call it again
@@ -332,6 +332,7 @@
PyInterpreterState *interp = tstate->interp;
PyThreadState *p;
int count = 0;
+ HEAD_LOCK();
for (p = interp->tstate_head; p != NULL; p = p->next) {
if (p->thread_id != id)
continue;
@@ -340,6 +341,7 @@
p->async_exc = exc;
count += 1;
}
+ HEAD_UNLOCK();
return count;
}