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// Copyright 2015 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef STARBOARD_SHARED_LIBEVENT_SOCKET_WAITER_INTERNAL_H_
#define STARBOARD_SHARED_LIBEVENT_SOCKET_WAITER_INTERNAL_H_
#include <map>
#include "starboard/common/socket.h"
#include "starboard/shared/internal_only.h"
#include "starboard/socket_waiter.h"
#include "starboard/thread.h"
#include "starboard/types.h"
#include "third_party/libevent/event.h"
struct SbSocketWaiterPrivate {
public:
SbSocketWaiterPrivate();
~SbSocketWaiterPrivate();
// These methods implement the SbSocketWaiter API defined in socket_waiter.h.
bool Add(SbSocket socket,
void* context,
SbSocketWaiterCallback callback,
int interests,
bool persistent);
bool Remove(SbSocket socket);
void Wait();
SbSocketWaiterResult WaitTimed(int64_t duration_usec);
void WakeUp(bool timeout);
private:
// A registration of a socket with a socket waiter.
struct Waitee {
Waitee(SbSocketWaiter waiter,
SbSocket socket,
void* context,
SbSocketWaiterCallback callback,
int interests,
bool persistent)
: waiter(waiter),
socket(socket),
context(context),
callback(callback),
interests(interests),
persistent(persistent) {}
// The waiter this event is registered with.
SbSocketWaiter waiter;
// The socket registered with the waiter.
SbSocket socket;
// A context value that will be passed to the callback.
void* context;
// The callback to call when one or more registered interests become ready.
SbSocketWaiterCallback callback;
// The set of interests registered with the waiter.
int interests;
// Whether this Waitee should stay registered after the next callback.
bool persistent;
// The libevent event backing this Waitee.
struct event event;
};
// The way Waitees are stored, indexed by SbSocket.
//
// NOTE: This is a (tree) map because we don't have base::hash_map here. We
// should keep an eye out for whether this is a performance issue.
typedef std::map<SbSocket, Waitee*> WaiteesMap;
// The libevent callback function, which in turn calls the registered callback
// function for the Waitee.
static void LibeventSocketCallback(int fd, int16_t events, void* context);
// A libevent callback function that wakes up the SbSocketWaiter given in
// |context| due to a timeout.
static void LibeventTimeoutCallback(int fd, int16_t event, void* context);
// A libevent callback function that wakes up the SbSocketWaiter given in
// |context| due to an external call to WakeUp.
static void LibeventWakeUpCallback(int fd, int16_t event, void* context);
// Handles a libevent callback.
void HandleSignal(Waitee* waitee, short events); // NOLINT[runtime/int]
// Handles a libevent callback on the wakeup_read_fd_.
void HandleWakeUpRead();
// Adds |waitee| to the waitee registry.
void AddWaitee(Waitee* waitee);
// Gets the Waitee associated with the given socket, or NULL.
Waitee* GetWaitee(SbSocket socket);
// Gets the Waitee associated with the given socket, removing it from the
// registry, or NULL.
Waitee* RemoveWaitee(SbSocket socket) SB_WARN_UNUSED_RESULT;
// The thread this waiter was created on. Immutable, so accessible from any
// thread.
const SbThread thread_;
// The libevent event_base backing this waiter. Immutable, so accessible from
// any thread.
struct event_base* const base_;
// A file descriptor of the write end of a pipe that can be written to from
// any thread to wake up this waiter in a thread-safe manner.
int wakeup_write_fd_;
// A file descriptor of the read end of a pipe that this waiter will wait on
// to allow it to be signalled safely from other threads.
int wakeup_read_fd_;
// The libevent event that waits on |wakeup_read_fd_| for WakeUp signals.
struct event wakeup_event_;
// The registry of currently registered Waitees.
WaiteesMap waitees_;
// Whether or not the waiter is actually waiting.
bool waiting_;
// Whether or not the waiter was woken up.
bool woken_up_;
// Used to replace pipe.
SbSocket server_socket_;
SbSocket client_socket_;
};
#endif // STARBOARD_SHARED_LIBEVENT_SOCKET_WAITER_INTERNAL_H_