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243b9ac192
rather than col_sym_free. Move seqp declaration earlier. * resolv/gai_suspend.c (gai_suspend): Make sure result is initialized.
159 lines
4.6 KiB
C
159 lines
4.6 KiB
C
/* Copyright (C) 2001, 2006 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <netdb.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <sys/time.h>
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#include <gai_misc.h>
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int
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gai_suspend (const struct gaicb *const list[], int ent,
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const struct timespec *timeout)
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{
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struct waitlist waitlist[ent];
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struct requestlist *requestlist[ent];
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#ifndef DONT_NEED_GAI_MISC_COND
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pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
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#endif
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int cnt;
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int cntr = 1;
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int none = 1;
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int result;
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/* Request the mutex. */
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pthread_mutex_lock (&__gai_requests_mutex);
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/* There is not yet a finished request. Signal the request that
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we are working for it. */
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for (cnt = 0; cnt < ent; ++cnt)
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if (list[cnt] != NULL && list[cnt]->__return == EAI_INPROGRESS)
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{
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requestlist[cnt] = __gai_find_request (list[cnt]);
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if (requestlist[cnt] != NULL)
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{
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#ifndef DONT_NEED_GAI_MISC_COND
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waitlist[cnt].cond = &cond;
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#endif
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waitlist[cnt].next = requestlist[cnt]->waiting;
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waitlist[cnt].counterp = &cntr;
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waitlist[cnt].sigevp = NULL;
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waitlist[cnt].caller_pid = 0; /* Not needed. */
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requestlist[cnt]->waiting = &waitlist[cnt];
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none = 0;
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}
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}
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if (none)
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{
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if (cnt < ent)
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/* There is an entry which is finished. */
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result = 0;
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else
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result = EAI_ALLDONE;
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}
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else
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{
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/* There is no request done but some are still being worked on. */
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int oldstate;
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/* Since `pthread_cond_wait'/`pthread_cond_timedwait' are cancelation
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points we must be careful. We added entries to the waiting lists
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which we must remove. So defer cancelation for now. */
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pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &oldstate);
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#ifdef DONT_NEED_GAI_MISC_COND
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result = 0;
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GAI_MISC_WAIT (result, cntr, timeout, 1);
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#else
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if (timeout == NULL)
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result = pthread_cond_wait (&cond, &__gai_requests_mutex);
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else
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{
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/* We have to convert the relative timeout value into an
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absolute time value with pthread_cond_timedwait expects. */
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struct timeval now;
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struct timespec abstime;
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__gettimeofday (&now, NULL);
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abstime.tv_nsec = timeout->tv_nsec + now.tv_usec * 1000;
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abstime.tv_sec = timeout->tv_sec + now.tv_sec;
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if (abstime.tv_nsec >= 1000000000)
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{
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abstime.tv_nsec -= 1000000000;
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abstime.tv_sec += 1;
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}
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result = pthread_cond_timedwait (&cond, &__gai_requests_mutex,
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&abstime);
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}
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#endif
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/* Now remove the entry in the waiting list for all requests
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which didn't terminate. */
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for (cnt = 0; cnt < ent; ++cnt)
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if (list[cnt] != NULL && list[cnt]->__return == EAI_INPROGRESS
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&& requestlist[cnt] != NULL)
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{
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struct waitlist **listp = &requestlist[cnt]->waiting;
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/* There is the chance that we cannot find our entry anymore.
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This could happen if the request terminated and restarted
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again. */
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while (*listp != NULL && *listp != &waitlist[cnt])
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listp = &(*listp)->next;
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if (*listp != NULL)
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*listp = (*listp)->next;
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}
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/* Now it's time to restore the cancelation state. */
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pthread_setcancelstate (oldstate, NULL);
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#ifndef DONT_NEED_GAI_MISC_COND
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/* Release the conditional variable. */
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if (pthread_cond_destroy (&cond) != 0)
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/* This must never happen. */
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abort ();
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#endif
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if (result != 0)
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{
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/* An error occurred. Possibly it's EINTR. We have to translate
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the timeout error report of `pthread_cond_timedwait' to the
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form expected from `gai_suspend'. */
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if (__builtin_expect (result, ETIMEDOUT) == ETIMEDOUT)
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result = EAI_AGAIN;
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else if (result == EINTR)
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result = EAI_INTR;
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else
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result = EAI_SYSTEM;
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}
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}
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/* Release the mutex. */
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pthread_mutex_unlock (&__gai_requests_mutex);
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return result;
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}
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