2021-06-22 07:50:27 +00:00
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/* Notify initiator of AIO request.
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2023-01-06 21:08:04 +00:00
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Copyright (C) 1997-2023 Free Software Foundation, Inc.
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1997-06-23 21:55:26 +00:00
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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2001-07-06 04:58:11 +00:00
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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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1997-06-23 21:55:26 +00:00
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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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2001-07-06 04:58:11 +00:00
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Lesser General Public License for more details.
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1997-06-23 21:55:26 +00:00
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2001-07-06 04:58:11 +00:00
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You should have received a copy of the GNU Lesser General Public
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2012-02-09 23:18:22 +00:00
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License along with the GNU C Library; if not, see
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Prefer https to http for gnu.org and fsf.org URLs
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:
sed -ri '
s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
$(find $(git ls-files) -prune -type f \
! -name '*.po' \
! -name 'ChangeLog*' \
! -path COPYING ! -path COPYING.LIB \
! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
! -path manual/texinfo.tex ! -path scripts/config.guess \
! -path scripts/config.sub ! -path scripts/install-sh \
! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
! -path INSTALL ! -path locale/programs/charmap-kw.h \
! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
! '(' -name configure \
-execdir test -f configure.ac -o -f configure.in ';' ')' \
! '(' -name preconfigure \
-execdir test -f preconfigure.ac ';' ')' \
-print)
and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:
chmod a+x sysdeps/unix/sysv/linux/riscv/configure
# Omit irrelevant whitespace and comment-only changes,
# perhaps from a slightly-different Autoconf version.
git checkout -f \
sysdeps/csky/configure \
sysdeps/hppa/configure \
sysdeps/riscv/configure \
sysdeps/unix/sysv/linux/csky/configure
# Omit changes that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
git checkout -f \
sysdeps/powerpc/powerpc64/ppc-mcount.S \
sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
# Omit change that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 05:40:42 +00:00
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<https://www.gnu.org/licenses/>. */
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1995-02-18 01:27:10 +00:00
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2021-06-22 07:50:27 +00:00
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#include <errno.h>
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2021-06-25 08:30:35 +00:00
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#include <pthreadP.h>
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2021-06-22 07:50:27 +00:00
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#include <stdlib.h>
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#include <unistd.h>
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2005-12-14 08:43:25 +00:00
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#include <aio_misc.h>
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2021-06-22 07:50:27 +00:00
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#include <signal.h>
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1995-02-18 01:27:10 +00:00
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2021-06-25 08:30:35 +00:00
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#if !PTHREAD_IN_LIBC
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# define __pthread_attr_init pthread_attr_init
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# define __pthread_attr_setdetachstate pthread_attr_setdetachstate
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#endif
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2021-06-22 07:50:27 +00:00
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#ifndef aio_start_notify_thread
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# define aio_start_notify_thread() do { } while (0)
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#endif
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struct notify_func
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{
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void (*func) (sigval_t);
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sigval_t value;
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};
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static void *
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notify_func_wrapper (void *arg)
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{
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aio_start_notify_thread ();
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struct notify_func *const n = arg;
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void (*func) (sigval_t) = n->func;
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sigval_t value = n->value;
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free (n);
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(*func) (value);
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return NULL;
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}
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int
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__aio_notify_only (struct sigevent *sigev)
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{
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int result = 0;
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/* Send the signal to notify about finished processing of the request. */
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if (__glibc_unlikely (sigev->sigev_notify == SIGEV_THREAD))
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{
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/* We have to start a thread. */
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pthread_t tid;
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pthread_attr_t attr, *pattr;
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pattr = (pthread_attr_t *) sigev->sigev_notify_attributes;
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if (pattr == NULL)
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{
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2021-06-25 08:30:35 +00:00
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__pthread_attr_init (&attr);
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__pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
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2021-06-22 07:50:27 +00:00
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pattr = &attr;
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}
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/* SIGEV may be freed as soon as we return, so we cannot let the
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notification thread use that pointer. Even though a sigval_t is
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only one word and the same size as a void *, we cannot just pass
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the value through pthread_create as the argument and have the new
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thread run the user's function directly, because on some machines
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the calling convention for a union like sigval_t is different from
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that for a pointer type like void *. */
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struct notify_func *nf = malloc (sizeof *nf);
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if (nf == NULL)
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result = -1;
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else
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{
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nf->func = sigev->sigev_notify_function;
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nf->value = sigev->sigev_value;
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2021-06-25 08:30:35 +00:00
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if (__pthread_create (&tid, pattr, notify_func_wrapper, nf) < 0)
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2021-06-22 07:50:27 +00:00
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{
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free (nf);
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result = -1;
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}
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}
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}
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else if (sigev->sigev_notify == SIGEV_SIGNAL)
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{
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/* We have to send a signal. */
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#if _POSIX_REALTIME_SIGNALS > 0
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/* Note that the standard gives us the option of using a plain
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non-queuing signal here when SA_SIGINFO is not set for the signal. */
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if (__aio_sigqueue (sigev->sigev_signo, sigev->sigev_value, getpid ())
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< 0)
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result = -1;
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#else
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/* There are no queued signals on this system at all. */
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result = raise (sigev->sigev_signo);
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#endif
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}
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return result;
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}
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void
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__aio_notify (struct requestlist *req)
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{
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struct waitlist *waitlist;
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struct aiocb *aiocbp = &req->aiocbp->aiocb;
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if (__aio_notify_only (&aiocbp->aio_sigevent) != 0)
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{
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/* XXX What shall we do if already an error is set by
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read/write/fsync? */
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aiocbp->__error_code = errno;
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aiocbp->__return_value = -1;
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}
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/* Now also notify possibly waiting threads. */
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waitlist = req->waiting;
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while (waitlist != NULL)
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{
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struct waitlist *next = waitlist->next;
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if (waitlist->sigevp == NULL)
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{
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if (waitlist->result != NULL && aiocbp->__return_value == -1)
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*waitlist->result = -1;
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#ifdef DONT_NEED_AIO_MISC_COND
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AIO_MISC_NOTIFY (waitlist);
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#else
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/* Decrement the counter. */
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--*waitlist->counterp;
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pthread_cond_signal (waitlist->cond);
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#endif
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}
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else
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/* This is part of an asynchronous `lio_listio' operation. If
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this request is the last one, send the signal. */
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if (--*waitlist->counterp == 0)
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{
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__aio_notify_only (waitlist->sigevp);
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/* This is tricky. See lio_listio.c for the reason why
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this works. */
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free ((void *) waitlist->counterp);
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}
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waitlist = next;
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}
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}
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