node/deps/uv/src/uv-common.h

/* 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.
 */

/*
 * This file is private to libuv. It provides common functionality to both
 * Windows and Unix backends.
 */

#ifndef UV_COMMON_H_
#define UV_COMMON_H_

#include <assert.h>

#include "uv.h"
#include "tree.h"


#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))

#ifdef _MSC_VER
# define UNUSED /* empty */
#else
# define UNUSED __attribute__((unused))
#endif


#ifndef _WIN32
enum {
  UV__ACTIVE       = 0x4000,
  UV__REF          = 0x8000
};
#else
# define UV__REF     0x00000020
# define UV__ACTIVE  0x00000040
#endif

struct uv_ares_task_s {
  UV_HANDLE_FIELDS
#if _WIN32
  struct uv_req_s ares_req;
  SOCKET sock;
  HANDLE h_wait;
  WSAEVENT h_event;
  HANDLE h_close_event;
#else
  int sock;
  ev_io read_watcher;
  ev_io write_watcher;
#endif
  RB_ENTRY(uv_ares_task_s) node;
};


void uv_remove_ares_handle(uv_ares_task_t* handle);
uv_ares_task_t* uv_find_ares_handle(uv_loop_t*, ares_socket_t sock);

/* TODO Rename to uv_ares_task_init? */
void uv_add_ares_handle(uv_loop_t* loop, uv_ares_task_t* handle);

int uv_ares_handles_empty(uv_loop_t* loop);

extern const uv_err_t uv_ok_;

uv_err_code uv_translate_sys_error(int sys_errno);
int uv__set_error(uv_loop_t* loop, uv_err_code code, int sys_error);
int uv__set_sys_error(uv_loop_t* loop, int sys_error);
int uv__set_artificial_error(uv_loop_t* loop, uv_err_code code);
uv_err_t uv__new_sys_error(int sys_error);
uv_err_t uv__new_artificial_error(uv_err_code code);

int uv__tcp_bind(uv_tcp_t* handle, struct sockaddr_in addr);
int uv__tcp_bind6(uv_tcp_t* handle, struct sockaddr_in6 addr);

int uv__udp_bind(uv_udp_t* handle, struct sockaddr_in addr, unsigned flags);
int uv__udp_bind6(uv_udp_t* handle, struct sockaddr_in6 addr, unsigned flags);

int uv__tcp_connect(uv_connect_t* req,
                   uv_tcp_t* handle,
                   struct sockaddr_in address,
                   uv_connect_cb cb);

int uv__tcp_connect6(uv_connect_t* req,
                    uv_tcp_t* handle,
                    struct sockaddr_in6 address,
                    uv_connect_cb cb);

#ifndef UV_LEAN_AND_MEAN

UNUSED static int uv__has_active_handles(const uv_loop_t* loop) {
  return !ngx_queue_empty(&loop->active_handles);
}

UNUSED static int uv__has_active_reqs(const uv_loop_t* loop) {
  return !ngx_queue_empty(&loop->active_reqs);
}

UNUSED static void uv__active_handle_add(uv_handle_t* h) {
  ngx_queue_insert_tail(&h->loop->active_handles, &h->active_queue);
}

UNUSED static void uv__active_handle_rm(uv_handle_t* h) {
  assert(uv__has_active_handles(h->loop));
  ngx_queue_remove(&h->active_queue);
}

UNUSED static void uv__req_register(uv_loop_t* loop, uv_req_t* req) {
  ngx_queue_insert_tail(&loop->active_reqs, &req->active_queue);
}

UNUSED static void uv__req_unregister(uv_loop_t* loop, uv_req_t* req) {
  assert(uv__has_active_reqs(loop));
  ngx_queue_remove(&req->active_queue);
}

#else /* UV_LEAN_AND_MEAN */

UNUSED static int uv__has_active_handles(const uv_loop_t* loop) {
  return loop->active_handles > 0;
}

UNUSED static int uv__has_active_reqs(const uv_loop_t* loop) {
  return loop->active_reqs > 0;
}

UNUSED static void uv__active_handle_add(uv_handle_t* h) {
  h->loop->active_handles++;
}

UNUSED static void uv__active_handle_rm(uv_handle_t* h) {
  assert(h->loop->active_handles > 0);
  h->loop->active_handles--;
}

UNUSED static void uv__req_register(uv_loop_t* loop, uv_req_t* req) {
  loop->active_reqs++;
  (void) req;
}

UNUSED static void uv__req_unregister(uv_loop_t* loop, uv_req_t* req) {
  assert(loop->active_reqs > 0);
  loop->active_reqs--;
  (void) req;
}

#endif /* UV_LEAN_AND_MEAN */

#define uv__active_handle_add(h) uv__active_handle_add((uv_handle_t*)(h))
#define uv__active_handle_rm(h) uv__active_handle_rm((uv_handle_t*)(h))

#define uv__req_register(loop, req) uv__req_register((loop), (uv_req_t*)(req))
#define uv__req_unregister(loop, req) uv__req_unregister((loop), (uv_req_t*)(req))

UNUSED static int uv__is_active(const uv_handle_t* h) {
  return !!(h->flags & UV__ACTIVE);
}
#define uv__is_active(h) uv__is_active((const uv_handle_t*)(h))

UNUSED static void uv__handle_start(uv_handle_t* h) {
  if (h->flags & UV__ACTIVE) return;
  if (!(h->flags & UV__REF)) return;
  h->flags |= UV__ACTIVE;
  uv__active_handle_add(h);
}
#define uv__handle_start(h) uv__handle_start((uv_handle_t*)(h))

UNUSED static void uv__handle_stop(uv_handle_t* h) {
  if (!(h->flags & UV__ACTIVE)) return;
  if (!(h->flags & UV__REF)) return;
  uv__active_handle_rm(h);
  h->flags &= ~UV__ACTIVE;
}
#define uv__handle_stop(h) uv__handle_stop((uv_handle_t*)(h))

UNUSED static void uv__handle_ref(uv_handle_t* h) {
  if (h->flags & UV__REF) return;
  if (h->flags & UV__ACTIVE) uv__active_handle_add(h);
  h->flags |= UV__REF;
}
#define uv__handle_ref(h) uv__handle_ref((uv_handle_t*)(h))

UNUSED static void uv__handle_unref(uv_handle_t* h) {
  if (!(h->flags & UV__REF)) return;
  if (h->flags & UV__ACTIVE) uv__active_handle_rm(h);
  h->flags &= ~UV__REF;
}
#define uv__handle_unref(h) uv__handle_unref((uv_handle_t*)(h))

#endif /* UV_COMMON_H_ */