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      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 static_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_
     51