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authorUlrich Drepper <drepper@redhat.com>2001-03-03 18:21:04 +0000
committerUlrich Drepper <drepper@redhat.com>2001-03-03 18:21:04 +0000
commit2ace57217028da99fc98f79ae0a625a1ec842724 (patch)
treee7d7c34d61fae3e134dcb1029dfd901cae2c2ddc /resolv/gai_suspend.c
parent28b20578c97c8d53cc339446fdab31818cf701f6 (diff)
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Update.
* Versions.def: Add libanl definition. * shlig-versions: Add entry for libanl. * resolv/Makefile (distribute): Add gai_misc.h and ga_test.c. (routines): Add gai_sigqueue. (extra-libs): Add libanl. (libanl-routines): New variable. Add rules to build libanl and ga_test. * resolv/Versions [libc] (GLIBC_2.2.3): Add __gai_sigqueue. [libanl]: New library. * resolv/netdb.h: Add definitions for libanl. * resolv/getaddrinfo_a.c: New file. * resolv/gai_cancel.c: New file. * resolv/gai_error.c: New file. * resolv/gai_misc.c: New file. * resolv/gai_misc.h: New file. * resolv/gai_notify.c: New file. * resolv/gai_suspend.c: New file. * resolv/ga_test.c: New file. * sysdeps/generic/gai_sigqueue.c: New file. * sysdeps/unix/sysv/linux/gai_sigqueue.c: New file. * sysdeps/generic/bits/siginfo.h: Allow __need_sigevent_t being defined and provide only that definition. * sysdeps/unix/sysv/linux/alpha/bits/siginfo.h: Likewise. * sysdeps/unix/sysv/linux/bits/siginfo.h: Likewise. * sysdeps/unix/sysv/linux/ia64/bits/siginfo.h: Likewise. * sysdeps/unix/sysv/linux/mips/bits/siginfo.h: Likewise. * sysdeps/unix/sysv/linux/sparc/bits/siginfo.h: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/bits/siginfo.h: Likewise. * rt/aio_misc.c: Fix typos in comments. * rt/lio_listio.c: Pretty printing. Little optimization in request list handling. * elf/rtld.c: Remove commented out code.
Diffstat (limited to 'resolv/gai_suspend.c')
-rw-r--r--resolv/gai_suspend.c147
1 files changed, 147 insertions, 0 deletions
diff --git a/resolv/gai_suspend.c b/resolv/gai_suspend.c
new file mode 100644
index 0000000000..b82acb465f
--- /dev/null
+++ b/resolv/gai_suspend.c
@@ -0,0 +1,147 @@
+/* Copyright (C) 2001 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 Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <errno.h>
+#include <netdb.h>
+#include <pthread.h>
+#include <stdlib.h>
+#include <sys/time.h>
+
+#include "gai_misc.h"
+
+
+int
+gai_suspend (const struct gaicb *const list[], int ent,
+ const struct timespec *timeout)
+{
+ struct waitlist waitlist[ent];
+ struct requestlist *requestlist[ent];
+ pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
+ int cnt;
+ int dummy;
+ int none = 1;
+ int result;
+
+ /* Request the mutex. */
+ pthread_mutex_lock (&__gai_requests_mutex);
+
+ /* There is not yet a finished request. Signal the request that
+ we are working for it. */
+ for (cnt = 0; cnt < ent; ++cnt)
+ if (list[cnt] != NULL && list[cnt]->__return == EAI_INPROGRESS)
+ {
+ requestlist[cnt] = __gai_find_request (list[cnt]);
+
+ if (requestlist[cnt] != NULL)
+ {
+ waitlist[cnt].cond = &cond;
+ waitlist[cnt].next = requestlist[cnt]->waiting;
+ waitlist[cnt].counterp = &dummy;
+ waitlist[cnt].sigevp = NULL;
+ waitlist[cnt].caller_pid = 0; /* Not needed. */
+ requestlist[cnt]->waiting = &waitlist[cnt];
+ none = 0;
+ }
+ }
+
+ if (none)
+ {
+ if (cnt < ent)
+ /* There is an entry which is finished. */
+ result = 0;
+ else
+ result = EAI_ALLDONE;
+ }
+ else
+ {
+ /* There is no request done but some are still being worked on. */
+ int oldstate;
+
+ /* Since `pthread_cond_wait'/`pthread_cond_timedwait' are cancelation
+ points we must be careful. We added entries to the waiting lists
+ which we must remove. So defer cancelation for now. */
+ pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &oldstate);
+
+ if (timeout == NULL)
+ result = pthread_cond_wait (&cond, &__gai_requests_mutex);
+ else
+ {
+ /* We have to convert the relative timeout value into an
+ absolute time value with pthread_cond_timedwait expects. */
+ struct timeval now;
+ struct timespec abstime;
+
+ __gettimeofday (&now, NULL);
+ abstime.tv_nsec = timeout->tv_nsec + now.tv_usec * 1000;
+ abstime.tv_sec = timeout->tv_sec + now.tv_sec;
+ if (abstime.tv_nsec >= 1000000000)
+ {
+ abstime.tv_nsec -= 1000000000;
+ abstime.tv_sec += 1;
+ }
+
+ result = pthread_cond_timedwait (&cond, &__gai_requests_mutex,
+ &abstime);
+ }
+
+ /* Now remove the entry in the waiting list for all requests
+ which didn't terminate. */
+ for (cnt = 0; cnt < ent; ++cnt)
+ if (list[cnt] != NULL && list[cnt]->__return == EAI_INPROGRESS
+ && requestlist[cnt] != NULL)
+ {
+ struct waitlist **listp = &requestlist[cnt]->waiting;
+
+ /* There is the chance that we cannot find our entry anymore.
+ This could happen if the request terminated and restarted
+ again. */
+ while (*listp != NULL && *listp != &waitlist[cnt])
+ listp = &(*listp)->next;
+
+ if (*listp != NULL)
+ *listp = (*listp)->next;
+ }
+
+ /* Now it's time to restore the cancelation state. */
+ pthread_setcancelstate (oldstate, NULL);
+
+ /* Release the conditional variable. */
+ if (pthread_cond_destroy (&cond) != 0)
+ /* This must never happen. */
+ abort ();
+
+ if (result != 0)
+ {
+ /* An error occurred. Possibly it's EINTR. We have to translate
+ the timeout error report of `pthread_cond_timedwait' to the
+ form expected from `gai_suspend'. */
+ if (__builtin_expect (result, ETIMEDOUT) == ETIMEDOUT)
+ result = EAI_AGAIN;
+ else if (result == EINTR)
+ result = EAI_INTR;
+ else
+ result = EAI_SYSTEM;
+ }
+ }
+
+ /* Release the mutex. */
+ pthread_mutex_unlock (&__gai_requests_mutex);
+
+ return result;
+}