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// Copyright 2018 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 BASE_FUCHSIA_ASYNC_DISPATCHER_H_
#define BASE_FUCHSIA_ASYNC_DISPATCHER_H_
#include <lib/async/default.h>
#include <lib/async/dispatcher.h>
#include "base/containers/linked_list.h"
#include "base/fuchsia/scoped_zx_handle.h"
#include "base/macros.h"
#include "base/synchronization/lock.h"
#include "base/threading/thread_checker.h"
namespace base {
// Implementation of dispatcher for Fuchsia's async library. It's necessary to
// run Fuchsia's library on chromium threads.
class AsyncDispatcher : public async_t {
public:
AsyncDispatcher();
~AsyncDispatcher();
// Returns after running one or more tasks or waits until |deadline|.
// Returns |ZX_OK| if some tasks were executed, |ZX_ERR_TIMED_OUT| - the
// deadline expired, |ZX_ERR_CANCELED| - Stop() was called.
zx_status_t DispatchOrWaitUntil(zx_time_t deadline);
// If Run() is being executed then it will return as soon as possible (e.g.
// finishing running the current task), otherwise the following Run() call
// will quit immediately instead of waiting until deadline expires.
void Stop();
private:
class WaitState;
class TaskState;
static zx_time_t NowOp(async_t* async);
static zx_status_t BeginWaitOp(async_t* async, async_wait_t* wait);
static zx_status_t CancelWaitOp(async_t* async, async_wait_t* wait);
static zx_status_t PostTaskOp(async_t* async, async_task_t* task);
static zx_status_t CancelTaskOp(async_t* async, async_task_t* task);
static zx_status_t QueuePacketOp(async_t* async,
async_receiver_t* receiver,
const zx_packet_user_t* data);
static zx_status_t SetGuestBellTrapOp(async_t* async,
async_guest_bell_trap_t* trap,
zx_handle_t guest,
zx_vaddr_t addr,
size_t length);
// async_ops_t implementation. Called by corresponding *Op() methods above.
zx_status_t BeginWait(async_wait_t* wait);
zx_status_t CancelWait(async_wait_t* wait);
zx_status_t PostTask(async_task_t* task);
zx_status_t CancelTask(async_task_t* task);
// Runs tasks in |task_list_| that have deadline in the past.
void DispatchTasks();
// Must be called while |lock_| is held.
void RestartTimerLocked();
THREAD_CHECKER(thread_checker_);
ScopedZxHandle port_;
ScopedZxHandle timer_;
ScopedZxHandle stop_event_;
LinkedList<WaitState> wait_list_;
// |lock_| must be held when accessing |task_list_|.
base::Lock lock_;
LinkedList<TaskState> task_list_;
DISALLOW_COPY_AND_ASSIGN(AsyncDispatcher);
};
} // namespace base
#endif // BASE_FUCHSIA_ASYNC_DISPATCHER_H_
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