From 5328df6534b9fa2ca83cbbac013ef1e094e11907 Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Sat, 9 Jan 2010 09:47:45 -0800
Subject: runtime: check for preemption due to garbage collection 	in
 various already expensive routines.

helps keep cpu utilization up when GOMAXPROCS > 1,
but not a full solution.

http://groups.google.com/group/golang-nuts/t/7a9535c4136d3e2

R=r
CC=golang-dev
https://golang.org/cl/184043
---
 src/pkg/runtime/hashmap.c | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'src/pkg/runtime/hashmap.c')

diff --git a/src/pkg/runtime/hashmap.c b/src/pkg/runtime/hashmap.c
index 870274ae91..5bcd8bf416 100644
--- a/src/pkg/runtime/hashmap.c
+++ b/src/pkg/runtime/hashmap.c
@@ -744,6 +744,9 @@ mapaccess(Hmap *h, byte *ak, byte *av, bool *pres)
 {
 	byte *res;
 
+	if(gcwaiting)
+		gosched();
+
 	res = nil;
 	if(hash_lookup(h, ak, (void**)&res)) {
 		*pres = true;
@@ -812,6 +815,9 @@ mapassign(Hmap *h, byte *ak, byte *av)
 	byte *res;
 	int32 hit;
 
+	if(gcwaiting)
+		gosched();
+
 	res = nil;
 	if(av == nil) {
 		hash_remove(h, ak, (void**)&res);
@@ -908,6 +914,9 @@ mapiterinit(Hmap *h)
 void
 runtime·mapiternext(struct hash_iter *it)
 {
+	if(gcwaiting)
+		gosched();
+
 	it->data = hash_next(it);
 	if(debug) {
 		prints("runtime·mapiternext: iter=");
-- 
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