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libuv/src/unix/loop.c  view on Meta::CPAN

 * 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) {
  void* saved_data;
  int err;


  saved_data = loop->data;
  memset(loop, 0, sizeof(*loop));
  loop->data = saved_data;

  heap_init((struct heap*) &loop->timer_heap);
  QUEUE_INIT(&loop->wq);
  QUEUE_INIT(&loop->idle_handles);
  QUEUE_INIT(&loop->async_handles);
  QUEUE_INIT(&loop->check_handles);
  QUEUE_INIT(&loop->prepare_handles);
  QUEUE_INIT(&loop->handle_queue);

  loop->active_handles = 0;
  loop->active_reqs.count = 0;
  loop->nfds = 0;
  loop->watchers = NULL;
  loop->nwatchers = 0;
  QUEUE_INIT(&loop->pending_queue);
  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)
    return err;

  uv__signal_global_once_init();
  err = uv_signal_init(loop, &loop->child_watcher);
  if (err)
    goto fail_signal_init;

  uv__handle_unref(&loop->child_watcher);
  loop->child_watcher.flags |= UV_HANDLE_INTERNAL;
  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:
  uv__signal_loop_cleanup(loop);

fail_signal_init:
  uv__platform_loop_delete(loop);

  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++) {