kc3-lang/libevent/event-internal.h

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• Hash : 02b2b4d1
  Author :
  Date : 2008-12-23T16:37:01
  

  Restructure the event backends so that they do not need to keep track of events themselves, as a side effect multiple events can use the same fd or signal.
  
  svn:r972
  

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• event-internal.h

• /*
   * Copyright (c) 2000-2004 Niels Provos <provos@citi.umich.edu>
   * All rights reserved.
   *
   * 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 _EVENT_INTERNAL_H_
  #define _EVENT_INTERNAL_H_
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  #include "config.h"
  #include "min_heap.h"
  #include "evsignal.h"
  #include "mm-internal.h"
  
  /* map union members back */
  
  /* mutually exclusive */
  #define ev_signal_next	_ev.ev_signal.ev_signal_next
  #define ev_io_next	_ev.ev_io.ev_io_next
  
  /* used only by signals */
  #define ev_ncalls	_ev.ev_signal.ev_ncalls
  #define ev_pncalls	_ev.ev_signal.ev_pncalls
  
  struct eventop {
  	const char *name;
  	void *(*init)(struct event_base *);
  	int (*add)(struct event_base *, evutil_socket_t fd, short old, short events);
  	int (*del)(struct event_base *, evutil_socket_t fd, short old, short events);
  	int (*dispatch)(struct event_base *, struct timeval *);
  	void (*dealloc)(struct event_base *);
  	/* set if we need to reinitialize the event base */
  	int need_reinit;
  	enum event_method_feature features;
  };
  
  /* used to map multiple events to the same underlying identifier */
  struct event_map {
  	void *entries;
  	int nentries;
  };
  
  struct event_base {
  	const struct eventop *evsel;
  	void *evbase;
  
  	/* signal handling info */
  	const struct eventop *evsigsel;
  	void *evsigbase;
  
  	struct evsignal_info sig;
  
  	int event_count;		/* counts number of total events */
  	int event_count_active;	/* counts number of active events */
  
  	int event_gotterm;		/* Set to terminate loop */
  	int event_break;		/* Set to terminate loop immediately */
  
  	/* active event management */
  	struct event_list **activequeues;
  	int nactivequeues;
  
  	/* for mapping io activity to events */
  	struct event_map io;
  
  	/* for mapping signal activity to events */
  	struct event_map sigmap;
  
  	struct event_list eventqueue;
  	struct timeval event_tv;
  
  	struct min_heap timeheap;
  
  	struct timeval tv_cache;
  	
  	/* threading support */
  	unsigned long th_owner_id;
  	unsigned long (*th_get_id)(void);
  	void *th_base_lock;
  
  	/* allocate/free locks */
  	void *(*th_alloc)(void);
  	void (*th_free)(void *lock);
  
  	/* lock or unlock a lock */
  	void (*th_lock)(int mode, void *lock);
  	int th_notify_fd[2];
  	struct event th_notify;
  };
  
  struct event_config_entry {
  	TAILQ_ENTRY(event_config_entry) (next);
  
  	const char *avoid_method;
  };
  
  struct event_config {
  	TAILQ_HEAD(event_configq, event_config_entry) entries;
  
  	enum event_method_feature require_features;
  };
  
  /* Internal use only: Functions that might be missing from <sys/queue.h> */
  #ifndef HAVE_TAILQFOREACH
  #define	TAILQ_FIRST(head)		((head)->tqh_first)
  #define	TAILQ_END(head)			NULL
  #define	TAILQ_NEXT(elm, field)		((elm)->field.tqe_next)
  #define TAILQ_FOREACH(var, head, field)					\
  	for((var) = TAILQ_FIRST(head);					\
  	    (var) != TAILQ_END(head);					\
  	    (var) = TAILQ_NEXT(var, field))
  #define	TAILQ_INSERT_BEFORE(listelm, elm, field) do {			\
  	(elm)->field.tqe_prev = (listelm)->field.tqe_prev;		\
  	(elm)->field.tqe_next = (listelm);				\
  	*(listelm)->field.tqe_prev = (elm);				\
  	(listelm)->field.tqe_prev = &(elm)->field.tqe_next;		\
  } while (0)
  #endif /* TAILQ_FOREACH */
  
  int _evsignal_set_handler(struct event_base *base, int evsignal,
  			  void (*fn)(int));
  int _evsignal_restore_handler(struct event_base *base, int evsignal);
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* _EVENT_INTERNAL_H_ */
  

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