git: drawterm

Info  •  Files  •  Log  •  Branches

kernel: don't spin with osyield() on panic()

When screenputs is set and up != nil,
wait using sleep() instead of of spinning
with osyield() - which burned a cpu core.

This is just to not disappear the gui so
one can read the panic message.

--- a/kern/devcons.c

+++ b/kern/devcons.c

@@ -182,6 +182,14 @@

 	return n;

 }

+static void

+hang(void)

+{

+	Rendez z = {0};

+	while(up == nil) osyield();

+	for(;;) sleep(&z, return0, 0);

+}

+

 void

 panic(char *fmt, ...)

 {

@@ -191,8 +199,7 @@

 	kprintoq = nil;	/* don't try to write to /dev/kprint */

-	if(panicking++)

-		for(;;) osyield();

+	if(panicking++) hang();

 	splhi();

 	strcpy(buf, "panic: ");

 	va_start(arg, fmt);

@@ -201,8 +208,7 @@

 	buf[n] = '\n';

 	spllo();

 	putstrn(buf, n+1);

-	while(screenputs != 0)

-		osyield();

+	if(screenputs) hang();

 	setterm(0);

 	exit(1);

 }

-- 

⑨