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Diffstat (limited to 'sysdeps/pthread/aio_notify.c')
| -rw-r--r-- | sysdeps/pthread/aio_notify.c | 157 |
1 files changed, 0 insertions, 157 deletions
diff --git a/sysdeps/pthread/aio_notify.c b/sysdeps/pthread/aio_notify.c deleted file mode 100644 index a8d61503d8..0000000000 --- a/sysdeps/pthread/aio_notify.c +++ /dev/null @@ -1,157 +0,0 @@ -/* Notify initiator of AIO request. - Copyright (C) 1997-2021 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. - - 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 - <https://www.gnu.org/licenses/>. */ - -#include <errno.h> -#include <pthread.h> -#include <stdlib.h> -#include <unistd.h> -#include <aio_misc.h> -#include <signal.h> - -#ifndef aio_start_notify_thread -# define aio_start_notify_thread() do { } while (0) -#endif - -struct notify_func - { - void (*func) (sigval_t); - sigval_t value; - }; - -static void * -notify_func_wrapper (void *arg) -{ - aio_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 -__aio_notify_only (struct sigevent *sigev) -{ - int result = 0; - - /* Send the signal to notify about finished processing of the request. */ - if (__glibc_unlikely (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 _POSIX_REALTIME_SIGNALS > 0 - /* Note that the standard gives us the option of using a plain - non-queuing signal here when SA_SIGINFO is not set for the signal. */ - if (__aio_sigqueue (sigev->sigev_signo, sigev->sigev_value, getpid ()) - < 0) - result = -1; -#else - /* There are no queued signals on this system at all. */ - result = raise (sigev->sigev_signo); -#endif - } - - return result; -} - - -void -__aio_notify (struct requestlist *req) -{ - struct waitlist *waitlist; - struct aiocb *aiocbp = &req->aiocbp->aiocb; - - if (__aio_notify_only (&aiocbp->aio_sigevent) != 0) - { - /* XXX What shall we do if already an error is set by - read/write/fsync? */ - aiocbp->__error_code = errno; - aiocbp->__return_value = -1; - } - - /* Now also notify possibly waiting threads. */ - waitlist = req->waiting; - while (waitlist != NULL) - { - struct waitlist *next = waitlist->next; - - if (waitlist->sigevp == NULL) - { - if (waitlist->result != NULL && aiocbp->__return_value == -1) - *waitlist->result = -1; - -#ifdef DONT_NEED_AIO_MISC_COND - AIO_MISC_NOTIFY (waitlist); -#else - /* Decrement the counter. */ - --*waitlist->counterp; - - pthread_cond_signal (waitlist->cond); -#endif - } - else - /* This is part of an asynchronous `lio_listio' operation. If - this request is the last one, send the signal. */ - if (--*waitlist->counterp == 0) - { - __aio_notify_only (waitlist->sigevp); - /* This is tricky. See lio_listio.c for the reason why - this works. */ - free ((void *) waitlist->counterp); - } - - waitlist = next; - } -} |