1 /* Copyright (C) 2001 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
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 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
30 gai_suspend (const struct gaicb *const list[], int ent,
31 const struct timespec *timeout)
33 struct waitlist waitlist[ent];
34 struct requestlist *requestlist[ent];
35 pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
41 /* Request the mutex. */
42 pthread_mutex_lock (&__gai_requests_mutex);
44 /* There is not yet a finished request. Signal the request that
45 we are working for it. */
46 for (cnt = 0; cnt < ent; ++cnt)
47 if (list[cnt] != NULL && list[cnt]->__return == EAI_INPROGRESS)
49 requestlist[cnt] = __gai_find_request (list[cnt]);
51 if (requestlist[cnt] != NULL)
53 waitlist[cnt].cond = &cond;
54 waitlist[cnt].next = requestlist[cnt]->waiting;
55 waitlist[cnt].counterp = &dummy;
56 waitlist[cnt].sigevp = NULL;
57 waitlist[cnt].caller_pid = 0; /* Not needed. */
58 requestlist[cnt]->waiting = &waitlist[cnt];
66 /* There is an entry which is finished. */
73 /* There is no request done but some are still being worked on. */
76 /* Since `pthread_cond_wait'/`pthread_cond_timedwait' are cancelation
77 points we must be careful. We added entries to the waiting lists
78 which we must remove. So defer cancelation for now. */
79 pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &oldstate);
82 result = pthread_cond_wait (&cond, &__gai_requests_mutex);
85 /* We have to convert the relative timeout value into an
86 absolute time value with pthread_cond_timedwait expects. */
88 struct timespec abstime;
90 __gettimeofday (&now, NULL);
91 abstime.tv_nsec = timeout->tv_nsec + now.tv_usec * 1000;
92 abstime.tv_sec = timeout->tv_sec + now.tv_sec;
93 if (abstime.tv_nsec >= 1000000000)
95 abstime.tv_nsec -= 1000000000;
99 result = pthread_cond_timedwait (&cond, &__gai_requests_mutex,
103 /* Now remove the entry in the waiting list for all requests
104 which didn't terminate. */
105 for (cnt = 0; cnt < ent; ++cnt)
106 if (list[cnt] != NULL && list[cnt]->__return == EAI_INPROGRESS
107 && requestlist[cnt] != NULL)
109 struct waitlist **listp = &requestlist[cnt]->waiting;
111 /* There is the chance that we cannot find our entry anymore.
112 This could happen if the request terminated and restarted
114 while (*listp != NULL && *listp != &waitlist[cnt])
115 listp = &(*listp)->next;
118 *listp = (*listp)->next;
121 /* Now it's time to restore the cancelation state. */
122 pthread_setcancelstate (oldstate, NULL);
124 /* Release the conditional variable. */
125 if (pthread_cond_destroy (&cond) != 0)
126 /* This must never happen. */
131 /* An error occurred. Possibly it's EINTR. We have to translate
132 the timeout error report of `pthread_cond_timedwait' to the
133 form expected from `gai_suspend'. */
134 if (__builtin_expect (result, ETIMEDOUT) == ETIMEDOUT)
136 else if (result == EINTR)
143 /* Release the mutex. */
144 pthread_mutex_unlock (&__gai_requests_mutex);