diff options
Diffstat (limited to 'rt/lio_listio.c')
| -rw-r--r-- | rt/lio_listio.c | 187 |
1 files changed, 0 insertions, 187 deletions
diff --git a/rt/lio_listio.c b/rt/lio_listio.c deleted file mode 100644 index e1df603fd8..0000000000 --- a/rt/lio_listio.c +++ /dev/null @@ -1,187 +0,0 @@ -/* Enqueue and list of read or write requests. - Copyright (C) 1997, 1998, 1999, 2000, 2001 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 Library General Public License as - published by the Free Software Foundation; either version 2 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 - Library General Public License for more details. - - You should have received a copy of the GNU Library General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#include <aio.h> -#include <assert.h> -#include <errno.h> -#include <stdlib.h> -#include <unistd.h> - -#include "aio_misc.h" - - -/* We need this special structure to handle asynchronous I/O. */ -struct async_waitlist - { - int counter; - struct sigevent sigev; - struct waitlist list[0]; - }; - - -int -lio_listio (mode, list, nent, sig) - int mode; - struct aiocb *const list[]; - int nent; - struct sigevent *sig; -{ - struct sigevent defsigev; - struct requestlist *requests[nent]; - int cnt; - volatile int total = 0; - int result = 0; - - /* Check arguments. */ - if (mode != LIO_WAIT && mode != LIO_NOWAIT) - { - __set_errno (EINVAL); - return -1; - } - - if (sig == NULL) - { - defsigev.sigev_notify = SIGEV_NONE; - sig = &defsigev; - } - - /* Request the mutex. */ - pthread_mutex_lock (&__aio_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 < nent; ++cnt) - if (list[cnt] != NULL && list[cnt]->aio_lio_opcode != LIO_NOP) - { - list[cnt]->aio_sigevent.sigev_notify = SIGEV_NONE; - requests[cnt] = __aio_enqueue_request ((aiocb_union *) list[cnt], - list[cnt]->aio_lio_opcode); - - if (requests[cnt] != NULL) - /* Successfully enqueued. */ - ++total; - else - /* Signal that we've seen an error. `errno' and the error code - of the aiocb will tell more. */ - result = -1; - } - 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 (&__aio_requests_mutex); - - if (mode == LIO_NOWAIT) - __aio_notify_only (sig, - sig->sigev_notify == SIGEV_SIGNAL ? getpid () : 0); - - return result; - } - else if (mode == LIO_WAIT) - { - pthread_cond_t cond = PTHREAD_COND_INITIALIZER; - struct waitlist waitlist[nent]; - int oldstate; - - total = 0; - for (cnt = 0; cnt < nent; ++cnt) - { - assert (requests[cnt] == NULL || list[cnt] != NULL); - - if (requests[cnt] != NULL && list[cnt]->aio_lio_opcode != LIO_NOP) - { - waitlist[cnt].cond = &cond; - 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) - pthread_cond_wait (&cond, &__aio_requests_mutex); - - /* Now it's time to restore the cancelation state. */ - pthread_setcancelstate (oldstate, NULL); - - /* Release the conditional variable. */ - if (pthread_cond_destroy (&cond) != 0) - /* This must never happen. */ - abort (); - } - else - { - struct async_waitlist *waitlist; - - waitlist = (struct async_waitlist *) - malloc (sizeof (struct async_waitlist) - + (nent * sizeof (struct waitlist))); - - if (waitlist == NULL) - { - __set_errno (EAGAIN); - result = -1; - } - else - { - pid_t caller_pid = sig->sigev_notify == SIGEV_SIGNAL ? getpid () : 0; - total = 0; - - for (cnt = 0; cnt < nent; ++cnt) - { - assert (requests[cnt] == NULL || list[cnt] != NULL); - - if (requests[cnt] != NULL - && list[cnt]->aio_lio_opcode != LIO_NOP) - { - waitlist->list[cnt].cond = NULL; - 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 (&__aio_requests_mutex); - - return result; -} |