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.
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.
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.
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
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 #ifndef DONT_NEED_GAI_MISC_COND
36 pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
43 /* Request the mutex. */
44 pthread_mutex_lock (&__gai_requests_mutex);
46 /* There is not yet a finished request. Signal the request that
47 we are working for it. */
48 for (cnt = 0; cnt < ent; ++cnt)
49 if (list[cnt] != NULL && list[cnt]->__return == EAI_INPROGRESS)
51 requestlist[cnt] = __gai_find_request (list[cnt]);
53 if (requestlist[cnt] != NULL)
55 #ifndef DONT_NEED_GAI_MISC_COND
56 waitlist[cnt].cond = &cond;
58 waitlist[cnt].next = requestlist[cnt]->waiting;
59 waitlist[cnt].counterp = &cntr;
60 waitlist[cnt].sigevp = NULL;
61 waitlist[cnt].caller_pid = 0; /* Not needed. */
62 requestlist[cnt]->waiting = &waitlist[cnt];
70 /* There is an entry which is finished. */
77 /* There is no request done but some are still being worked on. */
80 /* Since `pthread_cond_wait'/`pthread_cond_timedwait' are cancelation
81 points we must be careful. We added entries to the waiting lists
82 which we must remove. So defer cancelation for now. */
83 pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &oldstate);
85 #ifdef DONT_NEED_GAI_MISC_COND
86 GAI_MISC_WAIT (result, cntr, timeout, 1);
89 result = pthread_cond_wait (&cond, &__gai_requests_mutex);
92 /* We have to convert the relative timeout value into an
93 absolute time value with pthread_cond_timedwait expects. */
95 struct timespec abstime;
97 __gettimeofday (&now, NULL);
98 abstime.tv_nsec = timeout->tv_nsec + now.tv_usec * 1000;
99 abstime.tv_sec = timeout->tv_sec + now.tv_sec;
100 if (abstime.tv_nsec >= 1000000000)
102 abstime.tv_nsec -= 1000000000;
106 result = pthread_cond_timedwait (&cond, &__gai_requests_mutex,
111 /* Now remove the entry in the waiting list for all requests
112 which didn't terminate. */
113 for (cnt = 0; cnt < ent; ++cnt)
114 if (list[cnt] != NULL && list[cnt]->__return == EAI_INPROGRESS
115 && requestlist[cnt] != NULL)
117 struct waitlist **listp = &requestlist[cnt]->waiting;
119 /* There is the chance that we cannot find our entry anymore.
120 This could happen if the request terminated and restarted
122 while (*listp != NULL && *listp != &waitlist[cnt])
123 listp = &(*listp)->next;
126 *listp = (*listp)->next;
129 /* Now it's time to restore the cancelation state. */
130 pthread_setcancelstate (oldstate, NULL);
132 #ifndef DONT_NEED_GAI_MISC_COND
133 /* Release the conditional variable. */
134 if (pthread_cond_destroy (&cond) != 0)
135 /* This must never happen. */
141 /* An error occurred. Possibly it's EINTR. We have to translate
142 the timeout error report of `pthread_cond_timedwait' to the
143 form expected from `gai_suspend'. */
144 if (__builtin_expect (result, ETIMEDOUT) == ETIMEDOUT)
146 else if (result == EINTR)
153 /* Release the mutex. */
154 pthread_mutex_unlock (&__gai_requests_mutex);