From fb1bcd47c6c172d93d2ed1f320baf49d96a88975 Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Fri, 9 Oct 2009 16:45:20 -0700
Subject: [PATCH] acid bug fix. lock printf output to avoid interlacing debug
 prints.

R=r
DELTA=10  (7 added, 0 deleted, 3 changed)
OCL=35539
CL=35561
---
 src/pkg/runtime/print.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/pkg/runtime/print.c b/src/pkg/runtime/print.c
index c9929cd454..fb2881be55 100644
--- a/src/pkg/runtime/print.c
+++ b/src/pkg/runtime/print.c
@@ -4,6 +4,7 @@
 
 #include "runtime.h"
 
+static Lock debuglock;
 
 void
 dump(byte *p, int32 n)
@@ -36,6 +37,8 @@ printf(int8 *s, ...)
 	int8 *p, *lp;
 	byte *arg, *narg;
 
+	lock(&debuglock);
+
 	lp = p = s;
 	arg = (byte*)(&s+1);
 	for(; *p; p++) {
@@ -96,6 +99,8 @@ printf(int8 *s, ...)
 	}
 	if(p > lp)
 		write(1, lp, p-lp);
+
+	unlock(&debuglock);
 }
 
 
-- 
2.48.1