From 6dfdd4c1e34c753fb9c897eee355ee6ca3f007a8 Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Mon, 9 Jan 2012 18:45:59 -0800
Subject: [PATCH] runtime: add NumCPU

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5528061
---
 src/pkg/runtime/extern.go    | 3 +++
 src/pkg/runtime/runtime1.goc | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/src/pkg/runtime/extern.go b/src/pkg/runtime/extern.go
index ea36355e66..e86da01732 100644
--- a/src/pkg/runtime/extern.go
+++ b/src/pkg/runtime/extern.go
@@ -107,6 +107,9 @@ func (f *Func) FileLine(pc uintptr) (file string, line int) {
 // mid returns the current os thread (m) id.
 func mid() uint32
 
+// NumCPU returns the number of CPUs on the local machine.
+func NumCPU() int
+
 // Semacquire waits until *s > 0 and then atomically decrements it.
 // It is intended as a simple sleep primitive for use by the synchronization
 // library and should not be used directly.
diff --git a/src/pkg/runtime/runtime1.goc b/src/pkg/runtime/runtime1.goc
index da2d0c5720..667131c1ee 100644
--- a/src/pkg/runtime/runtime1.goc
+++ b/src/pkg/runtime/runtime1.goc
@@ -8,3 +8,7 @@ package runtime
 func GOMAXPROCS(n int32) (ret int32) {
 	ret = runtime·gomaxprocsfunc(n);
 }
+
+func NumCPU() (ret int32) {
+	ret = runtime·ncpu;
+}