From 5046dbb4a7eba5eccfd258f92f4735c9ffc8d069 Mon Sep 17 00:00:00 2001 From: Zack Weinberg Date: Thu, 8 Jun 2017 15:39:03 -0400 Subject: Prepare for radical source tree reorganization. All top-level files and directories are moved into a temporary storage directory, REORG.TODO, except for files that will certainly still exist in their current form at top level when we're done (COPYING, COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which are moved to the new directory OldChangeLogs, instead), and the generated file INSTALL (which is just deleted; in the new order, there will be no generated files checked into version control). --- REORG.TODO/resolv/gai_notify.c | 132 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 132 insertions(+) create mode 100644 REORG.TODO/resolv/gai_notify.c (limited to 'REORG.TODO/resolv/gai_notify.c') diff --git a/REORG.TODO/resolv/gai_notify.c b/REORG.TODO/resolv/gai_notify.c new file mode 100644 index 0000000000..2056aee5e8 --- /dev/null +++ b/REORG.TODO/resolv/gai_notify.c @@ -0,0 +1,132 @@ +/* Copyright (C) 2001-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper , 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 + . */ + +#include +#include +#include +#include + + +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; + } +} -- cgit 1.4.1