1: /* Copyright (C) 2001, 2006 Free Software Foundation, Inc.
    2:    This file is part of the GNU C Library.
    3:    Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
    4: 
    5:    The GNU C Library is free software; you can redistribute it and/or
    6:    modify it under the terms of the GNU Lesser General Public
    7:    License as published by the Free Software Foundation; either
    8:    version 2.1 of the License, or (at your option) any later version.
    9: 
   10:    The GNU C Library is distributed in the hope that it will be useful,
   11:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   12:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   13:    Lesser General Public License for more details.
   14: 
   15:    You should have received a copy of the GNU Lesser General Public
   16:    License along with the GNU C Library; if not, write to the Free
   17:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   18:    02111-1307 USA.  */
   19: 
   20: #ifndef _GAI_MISC_H
   21: #define _GAI_MISC_H     1
   22: 
   23: #include <netdb.h>
   24: #include <signal.h>
   25: 
   26: 
   27: /* Used to synchronize.  */
   28: struct waitlist
   29:   {
   30:     struct waitlist *next;
   31: 
   32: #ifndef DONT_NEED_GAI_MISC_COND
   33:     pthread_cond_t *cond;
   34: #endif
   35:     volatile int *counterp;
   36:     /* The next field is used in asynchronous `lio_listio' operations.  */
   37:     struct sigevent *sigevp;
   38:     /* XXX See requestlist, it's used to work around the broken signal
   39:        handling in Linux.  */
   40:     pid_t caller_pid;
   41:   };
   42: 
   43: 
   44: /* Used to queue requests..  */
   45: struct requestlist
   46:   {
   47:     int running;
   48: 
   49:     struct requestlist *next;
   50: 
   51:     /* Pointer to the actual data.  */
   52:     struct gaicb *gaicbp;
   53: 
   54:     /* List of waiting processes.  */
   55:     struct waitlist *waiting;
   56:   };
   57: 
   58: /* To customize the implementation one can use the following struct.
   59:    This implementation follows the one in Irix.  */
   60: struct gaiinit
   61:   {
   62:     int gai_threads;            /* Maximal number of threads.  */
   63:     int gai_num;                /* Number of expected simultanious requests. */
   64:     int gai_locks;              /* Not used.  */
   65:     int gai_usedba;             /* Not used.  */
   66:     int gai_debug;              /* Not used.  */
   67:     int gai_numusers;           /* Not used.  */
   68:     int gai_idle_time;          /* Number of seconds before idle thread
   69:                                    terminates.  */
   70:     int gai_reserved;
   71:   };
   72: 
   73: 
   74: /* Lock for global I/O list of requests.  */
   75: extern pthread_mutex_t __gai_requests_mutex;
   76: 
   77: 
   78: /* Enqueue request.  */
   79: extern struct requestlist *__gai_enqueue_request (struct gaicb *gaicbp)
   80:      internal_function;
   81: 
   82: /* Find request on wait list.  */
   83: extern struct requestlist *__gai_find_request (const struct gaicb *gaicbp)
   84:      internal_function;
   85: 
   86: /* Remove request from waitlist.  */
   87: extern int __gai_remove_request (struct gaicb *gaicbp)
   88:      internal_function;
   89: 
   90: /* Notify initiator of request and tell this everybody listening.  */
   91: extern void __gai_notify (struct requestlist *req)
   92:      internal_function;
   93: 
   94: /* Notify initiator of request.  */
   95: extern int __gai_notify_only (struct sigevent *sigev, pid_t caller_pid)
   96:      internal_function;
   97: 
   98: /* Send the signal.  */
   99: extern int __gai_sigqueue (int sig, const union sigval val, pid_t caller_pid)
  100:      internal_function;
  101: 
  102: #endif /* gai_misc.h */