text: /* Copyright (C) 2001-2018 Free Software Foundation, Inc.
     This file is part of the GNU C Library.
     Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
  
     The GNU C Library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public
     License as published by the Free Software Foundation; either
     version 2.1 of the License, or (at your option) any later version.
  
     The GNU C Library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public
     License along with the GNU C Library; if not, see
     <http://www.gnu.org/licenses/>.  */
  
  #ifndef _GAI_MISC_H
  #define _GAI_MISC_H	1
  
  #include <netdb.h>
  #include <signal.h>
  
  
  /* Used to synchronize.  */
  struct waitlist
    {
      struct waitlist *next;
  
  #ifndef DONT_NEED_GAI_MISC_COND
      pthread_cond_t *cond;
  #endif
      volatile unsigned int *counterp;
      /* The next field is used in asynchronous `lio_listio' operations.  */
      struct sigevent *sigevp;
      /* XXX See requestlist, it's used to work around the broken signal
         handling in Linux.  */
      pid_t caller_pid;
    };
  
  
  /* Used to queue requests..  */
  struct requestlist
    {
      int running;
  
      struct requestlist *next;
  
      /* Pointer to the actual data.  */
      struct gaicb *gaicbp;
  
      /* List of waiting processes.  */
      struct waitlist *waiting;
    };
  
  /* To customize the implementation one can use the following struct.
     This implementation follows the one in Irix.  */
  struct gaiinit
    {
      int gai_threads;		/* Maximal number of threads.  */
      int gai_num;		/* Number of expected simultanious requests. */
      int gai_locks;		/* Not used.  */
      int gai_usedba;		/* Not used.  */
      int gai_debug;		/* Not used.  */
      int gai_numusers;		/* Not used.  */
      int gai_idle_time;		/* Number of seconds before idle thread
  				   terminates.  */
      int gai_reserved;
    };
  
  
  /* Lock for global I/O list of requests.  */
  extern pthread_mutex_t __gai_requests_mutex;
  
  
  /* Enqueue request.  */
  extern struct requestlist *__gai_enqueue_request (struct gaicb *gaicbp)
       attribute_hidden;
  
  /* Find request on wait list.  */
  extern struct requestlist *__gai_find_request (const struct gaicb *gaicbp)
       attribute_hidden;
  
  /* Remove request from waitlist.  */
  extern int __gai_remove_request (struct gaicb *gaicbp)
       attribute_hidden;
  
  /* Notify initiator of request and tell this everybody listening.  */
  extern void __gai_notify (struct requestlist *req)
       attribute_hidden;
  
  /* Notify initiator of request.  */
  extern int __gai_notify_only (struct sigevent *sigev, pid_t caller_pid)
       attribute_hidden;
  
  /* Send the signal.  */
  extern int __gai_sigqueue (int sig, const union sigval val, pid_t caller_pid);
  
  #endif /* gai_misc.h */
  