/* 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 "uv.h"

#include "uv/tree.h"

#include "internal.h"

#include "heap-inl.h"

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

int uv_loop_init(uv_loop_t* loop) {

  uv__loop_internal_fields_t* lfields;

  void* saved_data;

  int err;

  saved_data = loop->data;

  memset(loop, 0, sizeof(*loop));

  loop->data = saved_data;

  lfields = uv__calloc(1, sizeof(*lfields));

  if (lfields == NULL)

    return UV_ENOMEM;

  loop->internal_fields = lfields;

  err = uv_mutex_init(&lfields->loop_metrics.lock);

  if (err)

    goto fail_metrics_mutex_init;

  memset(&lfields->loop_metrics.metrics,

         0,

         sizeof(lfields->loop_metrics.metrics));

  heap_init((struct heap*) &loop->timer_heap);

  uv__queue_init(&loop->wq);

  uv__queue_init(&loop->idle_handles);

  uv__queue_init(&loop->async_handles);

  uv__queue_init(&loop->check_handles);

  uv__queue_init(&loop->prepare_handles);

  uv__queue_init(&loop->handle_queue);

  loop->active_handles = 0;

  loop->active_reqs.count = 0;

  loop->nfds = 0;

  loop->watchers = NULL;

  loop->nwatchers = 0;

  uv__queue_init(&loop->pending_queue);

  uv__queue_init(&loop->watcher_queue);

  loop->closing_handles = NULL;

  uv__update_time(loop);

  loop->async_io_watcher.fd = -1;

  loop->async_wfd = -1;

  loop->signal_pipefd[0] = -1;

  loop->signal_pipefd[1] = -1;

  loop->backend_fd = -1;

  loop->emfile_fd = -1;

  loop->timer_counter = 0;

  loop->stop_flag = 0;

  err = uv__platform_loop_init(loop);

  if (err)

    goto fail_platform_init;

  uv__signal_global_once_init();

  err = uv__process_init(loop);

  if (err)

    goto fail_process_init;

  uv__queue_init(&loop->process_handles);

  err = uv_rwlock_init(&loop->cloexec_lock);

  if (err)

    goto fail_rwlock_init;

  err = uv_mutex_init(&loop->wq_mutex);

  if (err)

    goto fail_mutex_init;

  err = uv_async_init(loop, &loop->wq_async, uv__work_done);

  if (err)

    goto fail_async_init;

  uv__handle_unref(&loop->wq_async);

  loop->wq_async.flags |= UV_HANDLE_INTERNAL;

  return 0;

fail_async_init:

  uv_mutex_destroy(&loop->wq_mutex);

fail_mutex_init:

  uv_rwlock_destroy(&loop->cloexec_lock);

fail_rwlock_init:

fail_process_init:

  uv__signal_loop_cleanup(loop);

  uv__platform_loop_delete(loop);

  if (loop->backend_fd != -1) {

    uv__close(loop->backend_fd);

    loop->backend_fd = -1;

  }

fail_platform_init:

  uv_mutex_destroy(&lfields->loop_metrics.lock);

fail_metrics_mutex_init:

  uv__free(lfields);

  loop->internal_fields = NULL;

  uv__free(loop->watchers);

  loop->nwatchers = 0;

  return err;

}

int uv_loop_fork(uv_loop_t* loop) {

  int err;

  unsigned int i;

  uv__io_t* w;

  err = uv__io_fork(loop);

  if (err)

    return err;

  err = uv__async_fork(loop);

  if (err)

    return err;

  err = uv__signal_loop_fork(loop);

  if (err)

    return err;

  /* Rearm all the watchers that aren't re-queued by the above. */

  for (i = 0; i < loop->nwatchers; i++) {

    w = loop->watchers[i];

    if (w == NULL)

      continue;

    if (w->pevents != 0 && uv__queue_empty(&w->watcher_queue)) {

      w->events = 0; /* Force re-registration in uv__io_poll. */

      uv__queue_insert_tail(&loop->watcher_queue, &w->watcher_queue);

    }

  }

  return 0;

}

void uv__loop_close(uv_loop_t* loop) {

  uv__loop_internal_fields_t* lfields;

  uv__signal_loop_cleanup(loop);

  uv__platform_loop_delete(loop);

  uv__async_stop(loop);

  if (loop->emfile_fd != -1) {

    uv__close(loop->emfile_fd);

    loop->emfile_fd = -1;

  }

  if (loop->backend_fd != -1) {

    uv__close(loop->backend_fd);

    loop->backend_fd = -1;

  }

  uv_mutex_lock(&loop->wq_mutex);

  assert(uv__queue_empty(&loop->wq) && "thread pool work queue not empty!");

  assert(!uv__has_active_reqs(loop));

  uv_mutex_unlock(&loop->wq_mutex);

  uv_mutex_destroy(&loop->wq_mutex);

  /*

   * Note that all thread pool stuff is finished at this point and

   * it is safe to just destroy rw lock

   */

  uv_rwlock_destroy(&loop->cloexec_lock);

#if 0

  assert(uv__queue_empty(&loop->pending_queue));

  assert(uv__queue_empty(&loop->watcher_queue));

  assert(loop->nfds == 0);

#endif

  uv__free(loop->watchers);

  loop->watchers = NULL;

  loop->nwatchers = 0;

  lfields = uv__get_internal_fields(loop);

  uv_mutex_destroy(&lfields->loop_metrics.lock);

  uv__free(lfields);

  loop->internal_fields = NULL;

}

int uv__loop_configure(uv_loop_t* loop, uv_loop_option option, va_list ap) {

  uv__loop_internal_fields_t* lfields;

  lfields = uv__get_internal_fields(loop);

  if (option == UV_METRICS_IDLE_TIME) {

    lfields->flags |= UV_METRICS_IDLE_TIME;

    return 0;

  }

#if defined(__linux__)

  if (option == UV_LOOP_USE_IO_URING_SQPOLL) {

    loop->flags |= UV_LOOP_ENABLE_IO_URING_SQPOLL;

    return 0;

  }

#endif

  if (option != UV_LOOP_BLOCK_SIGNAL)

    return UV_ENOSYS;

  if (va_arg(ap, int) != SIGPROF)

    return UV_EINVAL;

  loop->flags |= UV_LOOP_BLOCK_SIGPROF;

  return 0;

}