mojo/public/c/environment/async_waiter.h


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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_PUBLIC_C_ENVIRONMENT_ASYNC_WAITER_H_
#define MOJO_PUBLIC_C_ENVIRONMENT_ASYNC_WAITER_H_

#include "mojo/public/c/system/types.h"

typedef uintptr_t MojoAsyncWaitID;

typedef void (*MojoAsyncWaitCallback)(void* closure, MojoResult result);

struct MojoAsyncWaiter {
  // Asynchronously call MojoWait on a background thread, and pass the result
  // of MojoWait to the given MojoAsyncWaitCallback on the current thread.
  // Returns a non-zero MojoAsyncWaitID that can be used with CancelWait to
  // stop waiting. This identifier becomes invalid once the callback runs.
  MojoAsyncWaitID (*AsyncWait)(MojoHandle handle,
                               MojoWaitFlags flags,
                               MojoDeadline deadline,
                               MojoAsyncWaitCallback callback,
                               void* closure);

  // Cancel an existing call to AsyncWait with the given MojoAsyncWaitID. The
  // corresponding MojoAsyncWaitCallback will not be called in this case.
  void (*CancelWait)(MojoAsyncWaitID wait_id);
};

#endif  // MOJO_PUBLIC_C_ENVIRONMENT_ASYNC_WAITER_H_