1 files changed, 67 insertions, 0 deletions
diff --git a/src/pkg/runtime/plan9/mem.c b/src/pkg/runtime/plan9/mem.c
new file mode 100644
index 000000000..f795b2c01
--- /dev/null
+++ b/src/pkg/runtime/plan9/mem.c
@@ -0,0 +1,67 @@
+// 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 "malloc.h"
+#include "os.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 (void*)-1;
+	}
+	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);
+}