From: Dmitriy Vyukov <dvyukov@google.com>
Date: Thu, 26 Jun 2014 18:40:48 +0000 (-0700)
Subject: runtime: say when a goroutine is locked to OS thread
X-Git-Tag: go1.4beta1~1212
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=07f6f313a90b264377f8a9ecc4fadfe13bfff633;p=gostls13.git

runtime: say when a goroutine is locked to OS thread
Say when a goroutine is locked to OS thread in crash reports
and goroutine profiles.
It can be useful to understand what goroutines consume OS threads
(syscall and locked), e.g. if you forget to call UnlockOSThread
or leak locked goroutines.

R=golang-codereviews
CC=golang-codereviews, rsc
https://golang.org/cl/94170043
---

diff --git a/src/pkg/runtime/proc.c b/src/pkg/runtime/proc.c
index 7467e9fa16..dd98e8ce26 100644
--- a/src/pkg/runtime/proc.c
+++ b/src/pkg/runtime/proc.c
@@ -297,10 +297,12 @@ runtime·goroutineheader(G *gp)
 	if((gp->status == Gwaiting || gp->status == Gsyscall) && gp->waitsince != 0)
 		waitfor = (runtime·nanotime() - gp->waitsince) / (60LL*1000*1000*1000);
 
-	if(waitfor < 1)
-		runtime·printf("goroutine %D [%s]:\n", gp->goid, status);
-	else
-		runtime·printf("goroutine %D [%s, %D minutes]:\n", gp->goid, status, waitfor);
+	runtime·printf("goroutine %D [%s", gp->goid, status);
+	if(waitfor >= 1)
+		runtime·printf(", %D minutes", waitfor);
+	if(gp->lockedm != nil)
+		runtime·printf(", locked to thread");
+	runtime·printf("]:\n");
 }
 
 void