text: /* 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.
   */
  
  #ifndef UV_WIN_REQ_INL_H_
  #define UV_WIN_REQ_INL_H_
  
  #include <assert.h>
  
  #include "uv.h"
  #include "internal.h"
  
  
  #define SET_REQ_STATUS(req, status)                                     \
     (req)->u.io.overlapped.Internal = (ULONG_PTR) (status)
  
  #define SET_REQ_ERROR(req, error)                                       \
    SET_REQ_STATUS((req), NTSTATUS_FROM_WIN32((error)))
  
  /* Note: used open-coded in UV_REQ_INIT() because of a circular dependency
   * between src/uv-common.h and src/win/internal.h.
   */
  #define SET_REQ_SUCCESS(req)                                            \
    SET_REQ_STATUS((req), STATUS_SUCCESS)
  
  #define GET_REQ_STATUS(req)                                             \
    ((NTSTATUS) (req)->u.io.overlapped.Internal)
  
  #define REQ_SUCCESS(req)                                                \
    (NT_SUCCESS(GET_REQ_STATUS((req))))
  
  #define GET_REQ_ERROR(req)                                              \
    (pRtlNtStatusToDosError(GET_REQ_STATUS((req))))
  
  #define GET_REQ_SOCK_ERROR(req)                                         \
    (uv__ntstatus_to_winsock_error(GET_REQ_STATUS((req))))
  
  
  #define REGISTER_HANDLE_REQ(loop, handle, req)                          \
    do {                                                                  \
      INCREASE_ACTIVE_COUNT((loop), (handle));                            \
      uv__req_register((loop), (req));                                    \
    } while (0)
  
  #define UNREGISTER_HANDLE_REQ(loop, handle, req)                        \
    do {                                                                  \
      DECREASE_ACTIVE_COUNT((loop), (handle));                            \
      uv__req_unregister((loop), (req));                                  \
    } while (0)
  
  
  #define UV_SUCCEEDED_WITHOUT_IOCP(result)                               \
    ((result) && (handle->flags & UV_HANDLE_SYNC_BYPASS_IOCP))
  
  #define UV_SUCCEEDED_WITH_IOCP(result)                                  \
    ((result) || (GetLastError() == ERROR_IO_PENDING))
  
  
  #define POST_COMPLETION_FOR_REQ(loop, req)                              \
    if (!PostQueuedCompletionStatus((loop)->iocp,                         \
                                    0,                                    \
                                    0,                                    \
                                    &((req)->u.io.overlapped))) {         \
      uv_fatal_error(GetLastError(), "PostQueuedCompletionStatus");       \
    }
  
  
  INLINE static uv_req_t* uv__overlapped_to_req(OVERLAPPED* overlapped) {
    return CONTAINING_RECORD(overlapped, uv_req_t, u.io.overlapped);
  }
  
  
  INLINE static void uv__insert_pending_req(uv_loop_t* loop, uv_req_t* req) {
    req->next_req = NULL;
    if (loop->pending_reqs_tail) {
  #ifdef _DEBUG
      /* Ensure the request is not already in the queue, or the queue
       * will get corrupted.
       */
      uv_req_t* current = loop->pending_reqs_tail;
      do {
        assert(req != current);
        current = current->next_req;
      } while(current != loop->pending_reqs_tail);
  #endif
  
      req->next_req = loop->pending_reqs_tail->next_req;
      loop->pending_reqs_tail->next_req = req;
      loop->pending_reqs_tail = req;
    } else {
      req->next_req = req;
      loop->pending_reqs_tail = req;
    }
  }
  
  
  #define DELEGATE_STREAM_REQ(loop, req, method, handle_at)                     \
    do {                                                                        \
      switch (((uv_handle_t*) (req)->handle_at)->type) {                        \
        case UV_TCP:                                                            \
          uv__process_tcp_##method##_req(loop,                                  \
                                        (uv_tcp_t*) ((req)->handle_at),         \
                                        req);                                   \
          break;                                                                \
                                                                                \
        case UV_NAMED_PIPE:                                                     \
          uv__process_pipe_##method##_req(loop,                                 \
                                         (uv_pipe_t*) ((req)->handle_at),       \
                                         req);                                  \
          break;                                                                \
                                                                                \
        case UV_TTY:                                                            \
          uv__process_tty_##method##_req(loop,                                  \
                                        (uv_tty_t*) ((req)->handle_at),         \
                                        req);                                   \
          break;                                                                \
                                                                                \
        default:                                                                \
          assert(0);                                                            \
      }                                                                         \
    } while (0)
  
  
  INLINE static int uv__process_reqs(uv_loop_t* loop) {
    uv_req_t* req;
    uv_req_t* first;
    uv_req_t* next;
  
    if (loop->pending_reqs_tail == NULL)
      return 0;
  
    first = loop->pending_reqs_tail->next_req;
    next = first;
    loop->pending_reqs_tail = NULL;
  
    while (next != NULL) {
      req = next;
      next = req->next_req != first ? req->next_req : NULL;
  
      switch (req->type) {
        case UV_READ:
          DELEGATE_STREAM_REQ(loop, req, read, data);
          break;
  
        case UV_WRITE:
          DELEGATE_STREAM_REQ(loop, (uv_write_t*) req, write, handle);
          break;
  
        case UV_ACCEPT:
          DELEGATE_STREAM_REQ(loop, req, accept, data);
          break;
  
        case UV_CONNECT:
          DELEGATE_STREAM_REQ(loop, (uv_connect_t*) req, connect, handle);
          break;
  
        case UV_SHUTDOWN:
          /* Tcp shutdown requests don't come here. */
          assert(((uv_shutdown_t*) req)->handle->type == UV_NAMED_PIPE);
          uv__process_pipe_shutdown_req(
              loop,
              (uv_pipe_t*) ((uv_shutdown_t*) req)->handle,
              (uv_shutdown_t*) req);
          break;
  
        case UV_UDP_RECV:
          uv__process_udp_recv_req(loop, (uv_udp_t*) req->data, req);
          break;
  
        case UV_UDP_SEND:
          uv__process_udp_send_req(loop,
                                   ((uv_udp_send_t*) req)->handle,
                                   (uv_udp_send_t*) req);
          break;
  
        case UV_WAKEUP:
          uv__process_async_wakeup_req(loop, (uv_async_t*) req->data, req);
          break;
  
        case UV_SIGNAL_REQ:
          uv__process_signal_req(loop, (uv_signal_t*) req->data, req);
          break;
  
        case UV_POLL_REQ:
          uv__process_poll_req(loop, (uv_poll_t*) req->data, req);
          break;
  
        case UV_PROCESS_EXIT:
          uv__process_proc_exit(loop, (uv_process_t*) req->data);
          break;
  
        case UV_FS_EVENT_REQ:
          uv__process_fs_event_req(loop, req, (uv_fs_event_t*) req->data);
          break;
  
        default:
          assert(0);
      }
    }
  
    return 1;
  }
  
  #endif /* UV_WIN_REQ_INL_H_ */
  