lib/mmap: library to do memory allocation with anonymous memory maps

lib/mmap/mmap.go

@@ -0,0 +1,29 @@
+package mmap
+
+import "os"
+
+// PageSize is the minimum allocation size.  Allocations will use at
+// least this size and are likely to be multiplied up to a multiple of
+// this size.
+var PageSize = os.Getpagesize()
+
+// MustAlloc allocates size bytes and returns a slice containing them.  If
+// the allocation fails it will panic.  This is best used for
+// allocations which are a multiple of the PageSize.
+func MustAlloc(size int) []byte {
+	mem, err := Alloc(size)
+	if err != nil {
+		panic(err)
+	}
+	return mem
+}
+
+// MustFree frees buffers allocated by Alloc.  Note it should be passed
+// the same slice (not a derived slice) that Alloc returned.  If the
+// free fails it will panic.
+func MustFree(mem []byte) {
+	err := Free(mem)
+	if err != nil {
+		panic(err)
+	}
+}