kc3-lang/libevent/defer-internal.h

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• Hash : 60433a0a
  Author :
  Date : 2010-08-13T17:08:59
  

  Clean up syntax on TAILQ_ENTRY() usage
  
  Though the C standards allow it, it's apparently possible to get MSVC
  upset by saying "struct { int field; } (declarator);" instead of
  "struct {int field; } declarator;", so let's just not do that.
  
  Bugfix for 3044492
  
  (commit msg by nickm)
  

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• defer-internal.h

• /*
   * Copyright (c) 2009-2010 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 _DEFER_INTERNAL_H_
  #define _DEFER_INTERNAL_H_
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  #include "event2/event-config.h"
  #include <sys/queue.h>
  
  struct deferred_cb;
  
  typedef void (*deferred_cb_fn)(struct deferred_cb *, void *);
  
  /** A deferred_cb is a callback that can be scheduled to run as part of
   * an event_base's event_loop, rather than running immediately. */
  struct deferred_cb {
  	/** Links to the adjacent active (pending) deferred_cb objects. */
  	TAILQ_ENTRY (deferred_cb) cb_next;
  	/** True iff this deferred_cb is pending in an event_base. */
  	unsigned queued : 1;
  	/** The function to execute when the callback runs. */
  	deferred_cb_fn cb;
  	/** The function's second argument. */
  	void *arg;
  };
  
  /** A deferred_cb_queue is a list of deferred_cb that we can add to and run. */
  struct deferred_cb_queue {
  	/** Lock used to protect the queue. */
  	void *lock;
  
  	/** How many entries are in the queue? */
  	int active_count;
  
  	/** Function called when adding to the queue from another thread. */
  	void (*notify_fn)(struct deferred_cb_queue *, void *);
  	void *notify_arg;
  
  	/** Deferred callback management: a list of deferred callbacks to
  	 * run active the active events. */
  	TAILQ_HEAD (deferred_cb_list, deferred_cb) deferred_cb_list;
  };
  
  /**
     Initialize an empty, non-pending deferred_cb.
  
     @param deferred The deferred_cb structure to initialize.
     @param cb The function to run when the deferred_cb executes.
     @param arg The function's second argument.
   */
  void event_deferred_cb_init(struct deferred_cb *, deferred_cb_fn, void *);
  /**
     Cancel a deferred_cb if it is currently scheduled in an event_base.
   */
  void event_deferred_cb_cancel(struct deferred_cb_queue *, struct deferred_cb *);
  /**
     Activate a deferred_cb if it is not currently scheduled in an event_base.
   */
  void event_deferred_cb_schedule(struct deferred_cb_queue *, struct deferred_cb *);
  
  #ifdef _EVENT_DISABLE_THREAD_SUPPORT
  #define LOCK_DEFERRED_QUEUE(q) (void)0
  #define UNLOCK_DEFERRED_QUEUE(q) (void)0
  #else
  #define LOCK_DEFERRED_QUEUE(q)						\
  	do {								\
  		if ((q)->lock)						\
  			_evthread_lock_fns.lock(0, (q)->lock);		\
  	} while (0)
  
  #define UNLOCK_DEFERRED_QUEUE(q)					\
  	do {								\
  		if ((q)->lock)						\
  			_evthread_lock_fns.unlock(0, (q)->lock);	\
  	} while (0)
  #endif
  
  #ifdef __cplusplus
  }
  #endif
  
  void event_deferred_cb_queue_init(struct deferred_cb_queue *);
  struct deferred_cb_queue *event_base_get_deferred_cb_queue(struct event_base *);
  
  #endif /* _EVENT_INTERNAL_H_ */
  
  

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