mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 21:10:07 +00:00
133 lines
3.5 KiB
C
133 lines
3.5 KiB
C
/* Copyright (C) 2001-2013 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 Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <netdb.h>
|
|
#include <pthread.h>
|
|
#include <stdlib.h>
|
|
#include <gai_misc.h>
|
|
|
|
|
|
struct notify_func
|
|
{
|
|
void (*func) (sigval_t);
|
|
sigval_t value;
|
|
};
|
|
|
|
static void *
|
|
notify_func_wrapper (void *arg)
|
|
{
|
|
gai_start_notify_thread ();
|
|
struct notify_func *const n = arg;
|
|
void (*func) (sigval_t) = n->func;
|
|
sigval_t value = n->value;
|
|
free (n);
|
|
(*func) (value);
|
|
return NULL;
|
|
}
|
|
|
|
|
|
int
|
|
internal_function
|
|
__gai_notify_only (struct sigevent *sigev, pid_t caller_pid)
|
|
{
|
|
int result = 0;
|
|
|
|
/* Send the signal to notify about finished processing of the request. */
|
|
if (sigev->sigev_notify == SIGEV_THREAD)
|
|
{
|
|
/* We have to start a thread. */
|
|
pthread_t tid;
|
|
pthread_attr_t attr, *pattr;
|
|
|
|
pattr = (pthread_attr_t *) sigev->sigev_notify_attributes;
|
|
if (pattr == NULL)
|
|
{
|
|
pthread_attr_init (&attr);
|
|
pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
|
|
pattr = &attr;
|
|
}
|
|
|
|
/* SIGEV may be freed as soon as we return, so we cannot let the
|
|
notification thread use that pointer. Even though a sigval_t is
|
|
only one word and the same size as a void *, we cannot just pass
|
|
the value through pthread_create as the argument and have the new
|
|
thread run the user's function directly, because on some machines
|
|
the calling convention for a union like sigval_t is different from
|
|
that for a pointer type like void *. */
|
|
struct notify_func *nf = malloc (sizeof *nf);
|
|
if (nf == NULL)
|
|
result = -1;
|
|
else
|
|
{
|
|
nf->func = sigev->sigev_notify_function;
|
|
nf->value = sigev->sigev_value;
|
|
if (pthread_create (&tid, pattr, notify_func_wrapper, nf) < 0)
|
|
{
|
|
free (nf);
|
|
result = -1;
|
|
}
|
|
}
|
|
}
|
|
else if (sigev->sigev_notify == SIGEV_SIGNAL)
|
|
/* We have to send a signal. */
|
|
if (__gai_sigqueue (sigev->sigev_signo, sigev->sigev_value, caller_pid)
|
|
< 0)
|
|
result = -1;
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
void
|
|
internal_function
|
|
__gai_notify (struct requestlist *req)
|
|
{
|
|
struct waitlist *waitlist;
|
|
|
|
/* Now also notify possibly waiting threads. */
|
|
waitlist = req->waiting;
|
|
while (waitlist != NULL)
|
|
{
|
|
struct waitlist *next = waitlist->next;
|
|
|
|
if (waitlist->sigevp == NULL)
|
|
{
|
|
#ifdef DONT_NEED_GAI_MISC_COND
|
|
GAI_MISC_NOTIFY (waitlist);
|
|
#else
|
|
/* Decrement the counter. */
|
|
--*waitlist->counterp;
|
|
|
|
pthread_cond_signal (waitlist->cond);
|
|
#endif
|
|
}
|
|
else
|
|
/* This is part of an asynchronous `getaddrinfo_a' operation. If
|
|
this request is the last one, send the signal. */
|
|
if (--*waitlist->counterp == 0)
|
|
{
|
|
__gai_notify_only (waitlist->sigevp, waitlist->caller_pid);
|
|
/* This is tricky. See getaddrinfo_a.c for the reason why
|
|
this works. */
|
|
free ((void *) waitlist->counterp);
|
|
}
|
|
|
|
waitlist = next;
|
|
}
|
|
}
|