1// Copyright (c) 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef LIBRARIES_NACL_IO_FIFO_INTERFACE_H_
6#define LIBRARIES_NACL_IO_FIFO_INTERFACE_H_
7
8#include <stdint.h>
9#include <stdlib.h>
10
11namespace nacl_io {
12
13// FIFOInterface
14//
15// FIFOInterface provides a common interface for Emitters to update their
16// signalled state.  FIFOs do not have any internal locking and instead
17// reply on a parent (usually an emitter) to lock for them as appropriate.
18class FIFOInterface {
19 public:
20  virtual ~FIFOInterface() {};
21
22  virtual bool IsEmpty() = 0;
23  virtual bool IsFull() = 0;
24  virtual bool Resize(size_t len) = 0;
25
26  virtual size_t ReadAvailable() = 0;
27  virtual size_t WriteAvailable() = 0;
28};
29
30}  // namespace nacl_io
31
32#endif  // LIBRARIES_NACL_IO_FIFO_INTERFACE_H_
33