From 4cecda6c347bd6902b960c6a35a967add7070b0d Mon Sep 17 00:00:00 2001
From: Ondřej Surý <ondrej@sury.org>
Date: Mon, 30 Jan 2012 15:38:19 +0100
Subject: Imported Upstream version 2012.01.27

---
 src/pkg/runtime/mem_plan9.c | 68 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 src/pkg/runtime/mem_plan9.c

(limited to 'src/pkg/runtime/mem_plan9.c')

diff --git a/src/pkg/runtime/mem_plan9.c b/src/pkg/runtime/mem_plan9.c
new file mode 100644
index 000000000..15cbc176b
--- /dev/null
+++ b/src/pkg/runtime/mem_plan9.c
@@ -0,0 +1,68 @@
+// Copyright 2010 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "runtime.h"
+#include "arch_GOARCH.h"
+#include "malloc.h"
+#include "os_GOOS.h"
+
+extern byte end[];
+static byte *bloc = { end };
+static Lock memlock;
+
+enum
+{
+	Round = 4095
+};
+
+void*
+runtime·SysAlloc(uintptr nbytes)
+{
+	uintptr bl;
+	
+	runtime·lock(&memlock);
+	mstats.sys += nbytes;
+	// Plan 9 sbrk from /sys/src/libc/9sys/sbrk.c
+	bl = ((uintptr)bloc + Round) & ~Round;
+	if(runtime·brk_((void*)(bl + nbytes)) < 0) {
+		runtime·unlock(&memlock);
+		return nil;
+	}
+	bloc = (byte*)bl + nbytes;
+	runtime·unlock(&memlock);
+	return (void*)bl;
+}
+
+void
+runtime·SysFree(void *v, uintptr nbytes)
+{
+	runtime·lock(&memlock);
+	mstats.sys -= nbytes;
+	// from tiny/mem.c
+	// Push pointer back if this is a free
+	// of the most recent SysAlloc.
+	nbytes += (nbytes + Round) & ~Round;
+	if(bloc == (byte*)v+nbytes)
+		bloc -= nbytes;	
+	runtime·unlock(&memlock);
+}
+
+void
+runtime·SysUnused(void *v, uintptr nbytes)
+{
+	USED(v, nbytes);
+}
+
+void
+runtime·SysMap(void *v, uintptr nbytes)
+{
+	USED(v, nbytes);
+}
+
+void*
+runtime·SysReserve(void *v, uintptr nbytes)
+{
+	USED(v);
+	return runtime·SysAlloc(nbytes);
+}
-- 
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