ref: b1eca83bfc6cb960855d9e5b6457e710e335284e
parent: edafd783588d269cd0234e775b464be728bdcd92
author: 9ferno <gophone2015@gmail.com>
date: Fri Nov 5 19:19:06 EDT 2021
avoid panic when closing an empty channel
--- a/os/port/chan.c
+++ b/os/port/chan.c
@@ -512,7 +512,9 @@
void
cclose(Chan *c)
{
- if(c == nil || c->ref < 1 || c->flag&CFREE)
+ if(c == nil)
+ return;
+ if(c->ref < 1 || c->flag&CFREE)
panic("cclose %#p", getcallerpc(&c));
if(decref(c))