From: Dmitriy Vyukov <dvyukov@google.com>
Date: Fri, 14 Mar 2014 17:22:03 +0000 (+0400)
Subject: runtime: report "out of memory" in efence mode
X-Git-Tag: go1.3beta1~355
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=d8e6881166e280cc44056f1a6c9747a103dca340;p=gostls13.git

runtime: report "out of memory" in efence mode
Currently processes crash with obscure message.
Say that it's "out of memory".

LGTM=rsc
R=golang-codereviews
CC=golang-codereviews, khr, rsc
https://golang.org/cl/75820045
---

diff --git a/src/pkg/runtime/stack.c b/src/pkg/runtime/stack.c
index 81005de5d7..c0b98634d7 100644
--- a/src/pkg/runtime/stack.c
+++ b/src/pkg/runtime/stack.c
@@ -102,8 +102,12 @@ runtime·stackalloc(G *gp, uint32 n)
 		runtime·printf("stackalloc %d\n", n);
 
 	gp->stacksize += n;
-	if(runtime·debug.efence || StackFromSystem)
-		return runtime·SysAlloc(ROUND(n, PageSize), &mstats.stacks_sys);
+	if(runtime·debug.efence || StackFromSystem) {
+		v = runtime·SysAlloc(ROUND(n, PageSize), &mstats.stacks_sys);
+		if(v == nil)
+			runtime·throw("out of memory (stackalloc)");
+		return v;
+	}
 
 	// Minimum-sized stacks are allocated with a fixed-size free-list allocator,
 	// but if we need a stack of a bigger size, we fall back on malloc