blob: 9f1d6103ce6d4a3ce72667f5d20c0fc979005373 [file] [log] [blame]
// 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.
#include <lib/async/dispatcher.h>
#include <lib/async/exception.h>
#include <lib/zx/event.h>
#include <lib/zx/port.h>
#include <lib/zx/timer.h>
#include "base/containers/linked_list.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 BASE_EXPORT AsyncDispatcher : public async_dispatcher_t {
// 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();
class ExceptionState;
class WaitState;
class TaskState;
// ASYNC_OPS_V1 operations.
static zx_time_t NowOp(async_dispatcher_t* async);
static zx_status_t BeginWaitOp(async_dispatcher_t* async, async_wait_t* wait);
static zx_status_t CancelWaitOp(async_dispatcher_t* async,
async_wait_t* wait);
static zx_status_t PostTaskOp(async_dispatcher_t* async, async_task_t* task);
static zx_status_t CancelTaskOp(async_dispatcher_t* async,
async_task_t* task);
static zx_status_t QueuePacketOp(async_dispatcher_t* async,
async_receiver_t* receiver,
const zx_packet_user_t* data);
static zx_status_t SetGuestBellTrapOp(async_dispatcher_t* async,
async_guest_bell_trap_t* trap,
zx_handle_t guest,
zx_vaddr_t addr,
size_t length);
// ASYNC_OPS_V2 operations.
static zx_status_t BindExceptionPortOp(async_dispatcher_t* dispatcher,
async_exception_t* exception);
static zx_status_t UnbindExceptionPortOp(async_dispatcher_t* dispatcher,
async_exception_t* exception);
// 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);
zx_status_t BindExceptionPort(async_exception_t* exception);
zx_status_t UnbindExceptionPort(async_exception_t* exception);
// Runs tasks in |task_list_| that have deadline in the past.
void DispatchTasks();
// Must be called while |lock_| is held.
void RestartTimerLocked();
zx::port port_;
zx::timer timer_;
zx::event stop_event_;
LinkedList<WaitState> wait_list_;
LinkedList<ExceptionState> exception_list_;
async_ops_t ops_storage_;
// |lock_| must be held when accessing |task_list_|.
base::Lock lock_;
LinkedList<TaskState> task_list_;
} // namespace base