mojo/system/handle_signals_state.h

   1 // Copyright 2014 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 MOJO_SYSTEM_HANDLE_SIGNALS_STATE_H_
   6 #define MOJO_SYSTEM_HANDLE_SIGNALS_STATE_H_
   7
   8 #include "base/macros.h"
   9 #include "mojo/public/c/system/types.h"
  10 #include "mojo/system/system_impl_export.h"
  11
  12 namespace mojo {
  13 namespace system {
  14
  15 // Just "add" some constructors and methods to the C struct
  16 // |MojoHandleSignalsState| (for convenience). This should add no overhead.
  17 struct MOJO_SYSTEM_IMPL_EXPORT HandleSignalsState
  18     : public MojoHandleSignalsState {
  19   HandleSignalsState() {
  20     satisfied_signals = MOJO_HANDLE_SIGNAL_NONE;
  21     satisfiable_signals = MOJO_HANDLE_SIGNAL_NONE;
  22   }
  23   HandleSignalsState(MojoHandleSignals satisfied,
  24                      MojoHandleSignals satisfiable) {
  25     satisfied_signals = satisfied;
  26     satisfiable_signals = satisfiable;
  27   }
  28
  29   bool equals(const HandleSignalsState& other) const {
  30     return satisfied_signals == other.satisfied_signals &&
  31            satisfiable_signals == other.satisfiable_signals;
  32   }
  33
  34   bool satisfies(MojoHandleSignals signals) const {
  35     return !!(satisfied_signals & signals);
  36   }
  37
  38   bool can_satisfy(MojoHandleSignals signals) const {
  39     return !!(satisfiable_signals & signals);
  40   }
  41
  42   // (Copy and assignment allowed.)
  43 };
  44 COMPILE_ASSERT(sizeof(HandleSignalsState) == sizeof(MojoHandleSignalsState),
  45                HandleSignalsState_should_add_no_overhead);
  46
  47 }  // namespace system
  48 }  // namespace mojo
  49
  50 #endif  // MOJO_SYSTEM_HANDLE_SIGNALS_STATE_H_