Make the fuchsia mojo/public repo the source of truth.

mojo/public/cpp/system/wait.h

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef MOJO_PUBLIC_CPP_SYSTEM_WAIT_H_
-#define MOJO_PUBLIC_CPP_SYSTEM_WAIT_H_
-
-#include <mojo/result.h>
-#include <mojo/system/handle.h>
-#include <mojo/system/time.h>
-#include <mojo/system/wait.h>
-#include <stdint.h>
-
-#include <vector>
-
-#include "mojo/public/cpp/system/handle.h"
-
-namespace mojo {
-
-inline MojoResult Wait(Handle handle,
-                       MojoHandleSignals signals,
-                       MojoDeadline deadline,
-                       MojoHandleSignalsState* signals_state) {
-  return MojoWait(handle.value(), signals, deadline, signals_state);
-}
-
-const uint32_t kInvalidWaitManyIndexValue = static_cast<uint32_t>(-1);
-
-// Simplify the interpretation of the output from |MojoWaitMany()|.
-struct WaitManyResult {
-  explicit WaitManyResult(MojoResult mojo_wait_many_result)
-      : result(mojo_wait_many_result), index(kInvalidWaitManyIndexValue) {}
-
-  WaitManyResult(MojoResult mojo_wait_many_result, uint32_t result_index)
-      : result(mojo_wait_many_result), index(result_index) {}
-
-  // A valid handle index is always returned if |WaitMany()| succeeds, but may
-  // or may not be returned if |WaitMany()| returns an error. Use this helper
-  // function to check if |index| is a valid index into the handle array.
-  bool IsIndexValid() const { return index != kInvalidWaitManyIndexValue; }
-
-  // The |signals_states| array is always returned by |WaitMany()| on success,
-  // but may or may not be returned if |WaitMany()| returns an error. Use this
-  // helper function to check if |signals_states| holds valid data.
-  bool AreSignalsStatesValid() const {
-    return result != MOJO_RESULT_INVALID_ARGUMENT &&
-           result != MOJO_RESULT_RESOURCE_EXHAUSTED &&
-           result != MOJO_RESULT_BUSY;
-  }
-
-  MojoResult result;
-  uint32_t index;
-};
-
-// |HandleType| should be |Handle| or a "trivial" subclass thereof, like
-// |MessagePipeHandle|, etc.
-template <class HandleType>
-inline WaitManyResult WaitMany(
-    const std::vector<HandleType>& handles,
-    const std::vector<MojoHandleSignals>& signals,
-    MojoDeadline deadline,
-    std::vector<MojoHandleSignalsState>* signals_states) {
-  // We rely on being able to treat a vector of |HandleType|s as if it's an
-  // array of |MojoHandle|s.
-  static_assert(sizeof(HandleType) == sizeof(Handle),
-                "HandleType is not the same size as Handle");
-
-  if (signals.size() != handles.size() ||
-      (signals_states && signals_states->size() != signals.size()))
-    return WaitManyResult(MOJO_RESULT_INVALID_ARGUMENT);
-  if (handles.size() >= kInvalidWaitManyIndexValue)
-    return WaitManyResult(MOJO_RESULT_RESOURCE_EXHAUSTED);
-
-  if (handles.size() == 0) {
-    return WaitManyResult(
-        MojoWaitMany(nullptr, nullptr, 0, deadline, nullptr, nullptr));
-  }
-
-  uint32_t result_index = kInvalidWaitManyIndexValue;
-  MojoResult result = MojoWaitMany(
-      &handles[0].value(), signals.data(),
-      static_cast<uint32_t>(handles.size()), deadline, &result_index,
-      signals_states ? signals_states->data() : nullptr);
-  return WaitManyResult(result, result_index);
-}
-
-}  // namespace mojo
-
-#endif  // MOJO_PUBLIC_CPP_SYSTEM_WAIT_H_