int
gai_suspend (const struct gaicb *const list[], int ent,
const struct timespec *timeout)
{
struct waitlist waitlist[ent];
struct requestlist *requestlist[ent];
#ifndef DONT_NEED_GAI_MISC_COND
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
#endif
int cnt;
unsigned int cntr = 1;
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)
{
#ifndef DONT_NEED_GAI_MISC_COND
waitlist[cnt].cond = &cond;
#endif
waitlist[cnt].next = requestlist[cnt]->waiting;
waitlist[cnt].counterp = &cntr;
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);
#ifdef DONT_NEED_GAI_MISC_COND
result = 0;
GAI_MISC_WAIT (result, cntr, timeout, 1);
#else
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);
}
#endif
/* 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);
#ifndef DONT_NEED_GAI_MISC_COND
/* Release the conditional variable. */
if (pthread_cond_destroy (&cond) != 0)
/* This must never happen. */
abort ();
#endif
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 (__glibc_likely (result == 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;
}
int
getaddrinfo_a (int mode, struct gaicb *list[], int ent, struct sigevent *sig)
{
struct sigevent defsigev;
struct requestlist *requests[ent];
int cnt;
volatile int total = 0;
int result = 0;
/* Check arguments. */
if (mode != GAI_WAIT && mode != GAI_NOWAIT)
{
__set_errno (EINVAL);
return EAI_SYSTEM;
}
if (sig == NULL)
{
defsigev.sigev_notify = SIGEV_NONE;
sig = &defsigev;
}
/* Request the mutex. */
pthread_mutex_lock (&__gai_requests_mutex);
/* Now we can enqueue all requests. Since we already acquired the
mutex the enqueue function need not do this. */
for (cnt = 0; cnt < ent; ++cnt)
if (list[cnt] != NULL)
{
requests[cnt] = __gai_enqueue_request (list[cnt]);
if (requests[cnt] != NULL)
/* Successfully enqueued. */
++total;
else
/* Signal that we've seen an error. `errno' and the error code
of the gaicb will tell more. */
result = EAI_SYSTEM;
}
else
requests[cnt] = NULL;
if (total == 0)
{
/* We don't have anything to do except signalling if we work
asynchronously. */
/* Release the mutex. We do this before raising a signal since the
signal handler might do a `siglongjmp' and then the mutex is
locked forever. */
pthread_mutex_unlock (&__gai_requests_mutex);
if (mode == GAI_NOWAIT)
__gai_notify_only (sig,
sig->sigev_notify == SIGEV_SIGNAL ? getpid () : 0);
return result;
}
else if (mode == GAI_WAIT)
{
#ifndef DONT_NEED_GAI_MISC_COND
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
#endif
struct waitlist waitlist[ent];
int oldstate;
total = 0;
for (cnt = 0; cnt < ent; ++cnt)
if (requests[cnt] != NULL)
{
#ifndef DONT_NEED_GAI_MISC_COND
waitlist[cnt].cond = &cond;
#endif
waitlist[cnt].next = requests[cnt]->waiting;
waitlist[cnt].counterp = &total;
waitlist[cnt].sigevp = NULL;
waitlist[cnt].caller_pid = 0; /* Not needed. */
requests[cnt]->waiting = &waitlist[cnt];
++total;
}
/* 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);
while (total > 0)
{
#ifdef DONT_NEED_GAI_MISC_COND
int result;
GAI_MISC_WAIT (result, total, NULL, 1);
#else
pthread_cond_wait (&cond, &__gai_requests_mutex);
#endif
}
/* Now it's time to restore the cancelation state. */
pthread_setcancelstate (oldstate, NULL);
#ifndef DONT_NEED_GAI_MISC_COND
/* Release the conditional variable. */
if (pthread_cond_destroy (&cond) != 0)
/* This must never happen. */
abort ();
#endif
}
else
{
struct async_waitlist *waitlist;
waitlist = (struct async_waitlist *)
malloc (sizeof (struct async_waitlist)
+ (ent * sizeof (struct waitlist)));
if (waitlist == NULL)
result = EAI_AGAIN;
else
{
pid_t caller_pid = sig->sigev_notify == SIGEV_SIGNAL ? getpid () : 0;
total = 0;
for (cnt = 0; cnt < ent; ++cnt)
if (requests[cnt] != NULL)
{
#ifndef DONT_NEED_GAI_MISC_COND
waitlist->list[cnt].cond = NULL;
#endif
waitlist->list[cnt].next = requests[cnt]->waiting;
waitlist->list[cnt].counterp = &waitlist->counter;
waitlist->list[cnt].sigevp = &waitlist->sigev;
waitlist->list[cnt].caller_pid = caller_pid;
requests[cnt]->waiting = &waitlist->list[cnt];
++total;
}
waitlist->counter = total;
waitlist->sigev = *sig;
}
}
/* Release the mutex. */
pthread_mutex_unlock (&__gai_requests_mutex);
return result;
}
