/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to

 * deal in the Software without restriction, including without limitation the

 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or

 * sell copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS

 * IN THE SOFTWARE.

 */

#include <assert.h>

#include "uv.h"

#include "internal.h"

#include "atomicops-inl.h"

#include "handle-inl.h"

#include "req-inl.h"

void uv_async_endgame(uv_loop_t* loop, uv_async_t* handle) {

  if (handle->flags & UV_HANDLE_CLOSING &&

      !handle->async_sent) {

    assert(!(handle->flags & UV_HANDLE_CLOSED));

    uv__handle_close(handle);

  }

}

int uv_async_init(uv_loop_t* loop, uv_async_t* handle, uv_async_cb async_cb) {

  uv_req_t* req;

  uv__handle_init(loop, (uv_handle_t*) handle, UV_ASYNC);

  handle->async_sent = 0;

  handle->async_cb = async_cb;

  req = &handle->async_req;

  UV_REQ_INIT(req, UV_WAKEUP);

  req->data = handle;

  uv__handle_start(handle);

  return 0;

}

void uv_async_close(uv_loop_t* loop, uv_async_t* handle) {

  if (!((uv_async_t*)handle)->async_sent) {

    uv_want_endgame(loop, (uv_handle_t*) handle);

  }

  uv__handle_closing(handle);

}

int uv_async_send(uv_async_t* handle) {

  uv_loop_t* loop = handle->loop;

  if (handle->type != UV_ASYNC) {

    /* Can't set errno because that's not thread-safe. */

    return -1;

  }

  /* The user should make sure never to call uv_async_send to a closing or

   * closed handle. */

  assert(!(handle->flags & UV_HANDLE_CLOSING));

  if (!uv__atomic_exchange_set(&handle->async_sent)) {

    POST_COMPLETION_FOR_REQ(loop, &handle->async_req);

  }

  return 0;

}

void uv_process_async_wakeup_req(uv_loop_t* loop, uv_async_t* handle,

    uv_req_t* req) {

  assert(handle->type == UV_ASYNC);

  assert(req->type == UV_WAKEUP);

  handle->async_sent = 0;

  if (handle->flags & UV_HANDLE_CLOSING) {

    uv_want_endgame(loop, (uv_handle_t*)handle);

  } else if (handle->async_cb != NULL) {

    handle->async_cb(handle);

  }

}