native_client_sdk/src/libraries/nacl_io/fifo_interface.h

   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
  11 namespace 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.
  18 class 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_