commit 91ececc99741b3111c69d455bc928e871b15d766
from: Russ Cox <rsc@swtch.com>
date: Wed Dec 30 13:41:01 2020 UTC

libthread: drop schedlock

Having two locks in the proc was causing deadlocks.

commit - 4692dd4786f8847494d3f020bc3c05ba210adc0d
commit + 91ececc99741b3111c69d455bc928e871b15d766
blob - d72bf896df49831c4b3d5bdedb397c98ea25c4ae
blob + 79e0ec71f81ed265eaf0378c38643892cae03fab
--- src/libthread/thread.c
+++ src/libthread/thread.c
@@ -281,7 +281,7 @@ static void
 pthreadwakeupschedlocked(Proc *p, _Thread *self, _Thread *t)
 {
 	_threaddebug(self, "pthreadwakeupschedlocked %p %d", p, t->id);;
-	t->schedrend.l = &p->schedlock;
+	t->schedrend.l = &p->lock;
 	p->schedthread = t;
 	_procwakeup(&t->schedrend);
 }
blob - 9eddba21f316307703b742406b369dd2c0843d96
blob + fd40f25289c64fd2613ff48ed431596971acdfd7
--- src/libthread/threadimpl.h
+++ src/libthread/threadimpl.h
@@ -88,7 +88,6 @@ struct Proc
 	uint		nthread;
 	uint		sysproc;
 	_Procrendez	runrend;
-	Lock		schedlock;
 	_Thread	*schedthread;
 	void		*udata;
 	Jmp		sigjmp;