Mojo: Move waiting APIs to public library

mojo/public/cpp/system/handle.h

 // Copyright 2014 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_HANDLE_H_
 #define MOJO_PUBLIC_CPP_SYSTEM_HANDLE_H_
 
 #include <stdint.h>
 #include <limits>
 
@@ skipping 175 matching lines @@
 };
 
 // Should have zero overhead.
 static_assert(sizeof(Handle) == sizeof(MojoHandle), "Bad size for C++ Handle");
 
 // The scoper should also impose no more overhead.
 typedef ScopedHandleBase<Handle> ScopedHandle;
 static_assert(sizeof(ScopedHandle) == sizeof(Handle),
               "Bad size for C++ ScopedHandle");
 
-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()|.
-class WaitManyResult {
- public:
-  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;
-  }
-
-  MojoResult result;
-  uint32_t index;
-};
-
-// |HandleVectorType| and |FlagsVectorType| should be similar enough to
-// |std::vector<Handle>| and |std::vector<MojoHandleSignals>|, respectively:
-//  - They should have a (const) |size()| method that returns an unsigned type.
-//  - They must provide contiguous storage, with access via (const) reference to
-//    that storage provided by a (const) |operator[]()| (by reference).
-template <class HandleVectorType,
-          class FlagsVectorType,
-          class SignalsStateVectorType>
-inline WaitManyResult WaitMany(const HandleVectorType& handles,
-                               const FlagsVectorType& signals,
-                               MojoDeadline deadline,
-                               SignalsStateVectorType* signals_states) {
-  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;
-  const Handle& first_handle = handles[0];
-  const MojoHandleSignals& first_signals = signals[0];
-  MojoHandleSignalsState* first_state =
-      signals_states ? &(*signals_states)[0] : nullptr;
-  MojoResult result =
-      MojoWaitMany(reinterpret_cast<const MojoHandle*>(&first_handle),
-                   &first_signals, static_cast<uint32_t>(handles.size()),
-                   deadline, &result_index, first_state);
-  return WaitManyResult(result, result_index);
-}
-
-// C++ 4.10, regarding pointer conversion, says that an integral null pointer
-// constant can be converted to |std::nullptr_t| (which is a typedef for
-// |decltype(nullptr)|). The opposite direction is not allowed.
-template <class HandleVectorType, class FlagsVectorType>
-inline WaitManyResult WaitMany(const HandleVectorType& handles,
-                               const FlagsVectorType& signals,
-                               MojoDeadline deadline,
-                               decltype(nullptr) signals_states) {
-  if (signals.size() != handles.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;
-  const Handle& first_handle = handles[0];
-  const MojoHandleSignals& first_signals = signals[0];
-  MojoResult result = MojoWaitMany(
-      reinterpret_cast<const MojoHandle*>(&first_handle), &first_signals,
-      static_cast<uint32_t>(handles.size()), deadline, &result_index, nullptr);
-  return WaitManyResult(result, result_index);
-}
-
 // |Close()| takes ownership of the handle, since it'll invalidate it.
 // Note: There's nothing to do, since the argument will be destroyed when it
 // goes out of scope.
 template <class HandleType>
 inline void Close(ScopedHandleBase<HandleType> /*handle*/) {
 }
 
 // Most users should typically use |Close()| (above) instead.
 inline MojoResult CloseRaw(Handle handle) {
   return MojoClose(handle.value());
 }
 
 // Strict weak ordering, so that |Handle|s can be used as keys in |std::map|s,
 inline bool operator<(const Handle a, const Handle b) {
   return a.value() < b.value();
 }
 
 // Comparison, so that |Handle|s can be used as keys in hash maps.
 inline bool operator==(const Handle a, const Handle b) {
   return a.value() == b.value();
 }
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_SYSTEM_HANDLE_H_