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// 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_CORE_HANDLE_SIGNALS_STATE_H_
#define MOJO_CORE_HANDLE_SIGNALS_STATE_H_
#include "mojo/core/system_impl_export.h"
#include "mojo/public/c/system/types.h"
namespace mojo {
namespace core {
// A convenience wrapper around the MojoHandleSignalsState struct.
//
// NOTE: This is duplicated in the public C++ SDK to avoid circular
// dependencies between the EDK and the public SDK.
struct MOJO_SYSTEM_IMPL_EXPORT HandleSignalsState final
: public MojoHandleSignalsState {
HandleSignalsState() {
satisfied_signals = MOJO_HANDLE_SIGNAL_NONE;
satisfiable_signals = MOJO_HANDLE_SIGNAL_NONE;
}
HandleSignalsState(MojoHandleSignals satisfied,
MojoHandleSignals satisfiable) {
satisfied_signals = satisfied;
satisfiable_signals = satisfiable;
}
bool operator==(const HandleSignalsState& other) const {
return satisfied_signals == other.satisfied_signals &&
satisfiable_signals == other.satisfiable_signals;
}
// TODO(rockot): Remove this in favor of operator==.
bool equals(const HandleSignalsState& other) const {
return satisfied_signals == other.satisfied_signals &&
satisfiable_signals == other.satisfiable_signals;
}
bool satisfies_any(MojoHandleSignals signals) const {
return !!(satisfied_signals & signals);
}
bool satisfies_all(MojoHandleSignals signals) const {
return (satisfied_signals & signals) == signals;
}
bool can_satisfy_any(MojoHandleSignals signals) const {
return !!(satisfiable_signals & signals);
}
// The handle is currently readable. May apply to a message pipe handle or
// data pipe consumer handle.
bool readable() const { return satisfies_any(MOJO_HANDLE_SIGNAL_READABLE); }
// The handle is currently writable. May apply to a message pipe handle or
// data pipe producer handle.
bool writable() const { return satisfies_any(MOJO_HANDLE_SIGNAL_WRITABLE); }
// The handle's peer is closed. May apply to any message pipe or data pipe
// handle.
bool peer_closed() const {
return satisfies_any(MOJO_HANDLE_SIGNAL_PEER_CLOSED);
}
// The handle's peer exists in a remote execution context (e.g. in another
// process.)
bool peer_remote() const {
return satisfies_any(MOJO_HANDLE_SIGNAL_PEER_REMOTE);
}
// Indicates whether the handle has exceeded some quota limit.
bool quota_exceeded() const {
return satisfies_any(MOJO_HANDLE_SIGNAL_QUOTA_EXCEEDED);
}
// The handle will never be |readable()| again.
bool never_readable() const {
return !can_satisfy_any(MOJO_HANDLE_SIGNAL_READABLE);
}
// The handle will never be |writable()| again.
bool never_writable() const {
return !can_satisfy_any(MOJO_HANDLE_SIGNAL_WRITABLE);
}
// The handle can never indicate |peer_closed()|. Never true for message pipe
// or data pipe handles (they can always signal peer closure), but always true
// for other types of handles (they have no peer.)
bool never_peer_closed() const {
return !can_satisfy_any(MOJO_HANDLE_SIGNAL_PEER_CLOSED);
}
// The handle will never indicate |peer_remote()| again. True iff the peer is
// known to be closed.
bool never_peer_remote() const {
return !can_satisfy_any(MOJO_HANDLE_SIGNAL_PEER_REMOTE);
}
// (Copy and assignment allowed.)
};
static_assert(sizeof(HandleSignalsState) == sizeof(MojoHandleSignalsState),
"HandleSignalsState should add no overhead");
} // namespace core
} // namespace mojo
#endif // MOJO_CORE_HANDLE_SIGNALS_STATE_H_