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