/* 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 "handle-inl.h"

void uv_loop_watcher_endgame(uv_loop_t* loop, uv_handle_t* handle) {

  if (handle->flags & UV_HANDLE_CLOSING) {

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

    handle->flags |= UV_HANDLE_CLOSED;

    uv__handle_close(handle);

  }

}

#define UV_LOOP_WATCHER_DEFINE(name, NAME)                                    \

  int uv_##name##_init(uv_loop_t* loop, uv_##name##_t* handle) {              \

    uv__handle_init(loop, (uv_handle_t*) handle, UV_##NAME);                  \

                                                                              \

    return 0;                                                                 \

  }                                                                           \

                                                                              \

                                                                              \

  int uv_##name##_start(uv_##name##_t* handle, uv_##name##_cb cb) {           \

    uv_loop_t* loop = handle->loop;                                           \

    uv_##name##_t* old_head;                                                  \

                                                                              \

    assert(handle->type == UV_##NAME);                                        \

                                                                              \

    if (uv__is_active(handle))                                                \

      return 0;                                                               \

                                                                              \

    if (cb == NULL)                                                           \

      return UV_EINVAL;                                                       \

                                                                              \

    old_head = loop->name##_handles;                                          \

                                                                              \

    handle->name##_next = old_head;                                           \

    handle->name##_prev = NULL;                                               \

                                                                              \

    if (old_head) {                                                           \

      old_head->name##_prev = handle;                                         \

    }                                                                         \

                                                                              \

    loop->name##_handles = handle;                                            \

                                                                              \

    handle->name##_cb = cb;                                                   \

    uv__handle_start(handle);                                                 \

                                                                              \

    return 0;                                                                 \

  }                                                                           \

                                                                              \

                                                                              \

  int uv_##name##_stop(uv_##name##_t* handle) {                               \

    uv_loop_t* loop = handle->loop;                                           \

                                                                              \

    assert(handle->type == UV_##NAME);                                        \

                                                                              \

    if (!uv__is_active(handle))                                               \

      return 0;                                                               \

                                                                              \

    /* Update loop head if needed */                                          \

    if (loop->name##_handles == handle) {                                     \

      loop->name##_handles = handle->name##_next;                             \

    }                                                                         \

                                                                              \

    /* Update the iterator-next pointer of needed */                          \

    if (loop->next_##name##_handle == handle) {                               \

      loop->next_##name##_handle = handle->name##_next;                       \

    }                                                                         \

                                                                              \

    if (handle->name##_prev) {                                                \

      handle->name##_prev->name##_next = handle->name##_next;                 \

    }                                                                         \

    if (handle->name##_next) {                                                \

      handle->name##_next->name##_prev = handle->name##_prev;                 \

    }                                                                         \

                                                                              \

    uv__handle_stop(handle);                                                  \

                                                                              \

    return 0;                                                                 \

  }                                                                           \

                                                                              \

                                                                              \

  void uv_##name##_invoke(uv_loop_t* loop) {                                  \

    uv_##name##_t* handle;                                                    \

                                                                              \

    (loop)->next_##name##_handle = (loop)->name##_handles;                    \

                                                                              \

    while ((loop)->next_##name##_handle != NULL) {                            \

      handle = (loop)->next_##name##_handle;                                  \

      (loop)->next_##name##_handle = handle->name##_next;                     \

                                                                              \

      handle->name##_cb(handle);                                              \

    }                                                                         \

  }

UV_LOOP_WATCHER_DEFINE(prepare, PREPARE)

UV_LOOP_WATCHER_DEFINE(check, CHECK)

UV_LOOP_WATCHER_DEFINE(idle, IDLE)