kc3-lang/libevent/kqueue-internal.h

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• Hash : 53a07fe2
  Author :
  Date : 2010-09-17T00:34:13
  

  Replace pipe-based notification with EVFILT_USER where possible
  
  Sufficiently recent kqueue implementations have an EVFILT_USER filter
  that we can use to wake up an event base from another thread.  When
  it's supported, we now use this mechanism rather than our old
  (pipe-based) mechanism.  This should save some time and complications
  on newer OSX and freebsds.
  

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• kqueue-internal.h

• /*
   * Copyright (c) 2012 Niels Provos and Nick Mathewson
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. The name of the author may not be used to endorse or promote products
   *    derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  #ifndef KQUEUE_INTERNAL_H_INCLUDED_
  #define KQUEUE_INTERNAL_H_INCLUDED_
  
  /** Notification function, used to tell an event base to wake up from another
   * thread.  Only works when event_kq_add_notify_event_() has previously been
   * called successfully on that base. */
  int event_kq_notify_base_(struct event_base *base);
  
  /** Prepare a kqueue-using event base to receive notifications via an internal
   * EVFILT_USER event.  Return 0 on sucess, -1 on failure.
   */
  int event_kq_add_notify_event_(struct event_base *base);
  
  #endif
  

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