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/* Enqueue and list of read or write requests.
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Copyright (C) 1997-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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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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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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef lio_listio
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#include <aio.h>
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#include <assert.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <aio_misc.h>
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#define LIO_OPCODE_BASE 0
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#endif
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#include <shlib-compat.h>
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/* We need this special structure to handle asynchronous I/O. */
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struct async_waitlist
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{
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unsigned int counter;
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struct sigevent sigev;
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struct waitlist list[0];
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};
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/* The code in glibc 2.1 to glibc 2.4 issued only one event when all
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requests submitted with lio_listio finished. The existing practice
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is to issue events for the individual requests as well. This is
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what the new code does. */
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#if SHLIB_COMPAT (librt, GLIBC_2_1, GLIBC_2_4)
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# define LIO_MODE(mode) ((mode) & 127)
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# define NO_INDIVIDUAL_EVENT_P(mode) ((mode) & 128)
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#else
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# define LIO_MODE(mode) mode
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# define NO_INDIVIDUAL_EVENT_P(mode) 0
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#endif
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static int
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lio_listio_internal (int mode, struct aiocb *const list[], int nent,
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struct sigevent *sig)
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{
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struct sigevent defsigev;
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struct requestlist *requests[nent];
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int cnt;
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volatile unsigned int total = 0;
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int result = 0;
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if (sig == NULL)
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{
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defsigev.sigev_notify = SIGEV_NONE;
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sig = &defsigev;
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}
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/* Request the mutex. */
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pthread_mutex_lock (&__aio_requests_mutex);
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/* Now we can enqueue all requests. Since we already acquired the
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mutex the enqueue function need not do this. */
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for (cnt = 0; cnt < nent; ++cnt)
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if (list[cnt] != NULL && list[cnt]->aio_lio_opcode != LIO_NOP)
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{
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if (NO_INDIVIDUAL_EVENT_P (mode))
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list[cnt]->aio_sigevent.sigev_notify = SIGEV_NONE;
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requests[cnt] = __aio_enqueue_request ((aiocb_union *) list[cnt],
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(list[cnt]->aio_lio_opcode
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| LIO_OPCODE_BASE));
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if (requests[cnt] != NULL)
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/* Successfully enqueued. */
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++total;
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else
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/* Signal that we've seen an error. `errno' and the error code
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of the aiocb will tell more. */
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result = -1;
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}
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else
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requests[cnt] = NULL;
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if (total == 0)
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{
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/* We don't have anything to do except signalling if we work
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asynchronously. */
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/* Release the mutex. We do this before raising a signal since the
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signal handler might do a `siglongjmp' and then the mutex is
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locked forever. */
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pthread_mutex_unlock (&__aio_requests_mutex);
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if (LIO_MODE (mode) == LIO_NOWAIT)
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__aio_notify_only (sig);
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return result;
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}
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else if (LIO_MODE (mode) == LIO_WAIT)
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{
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#ifndef DONT_NEED_AIO_MISC_COND
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pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
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int oldstate;
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#endif
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struct waitlist waitlist[nent];
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total = 0;
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for (cnt = 0; cnt < nent; ++cnt)
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{
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assert (requests[cnt] == NULL || list[cnt] != NULL);
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if (requests[cnt] != NULL && list[cnt]->aio_lio_opcode != LIO_NOP)
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{
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#ifndef DONT_NEED_AIO_MISC_COND
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waitlist[cnt].cond = &cond;
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#endif
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waitlist[cnt].result = &result;
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waitlist[cnt].next = requests[cnt]->waiting;
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waitlist[cnt].counterp = &total;
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waitlist[cnt].sigevp = NULL;
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requests[cnt]->waiting = &waitlist[cnt];
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++total;
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}
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}
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#ifdef DONT_NEED_AIO_MISC_COND
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AIO_MISC_WAIT (result, total, NULL, 0);
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#else
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/* Since `pthread_cond_wait'/`pthread_cond_timedwait' are cancellation
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points we must be careful. We added entries to the waiting lists
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which we must remove. So defer cancellation for now. */
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pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &oldstate);
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while (total > 0)
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pthread_cond_wait (&cond, &__aio_requests_mutex);
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/* Now it's time to restore the cancellation state. */
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pthread_setcancelstate (oldstate, NULL);
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/* Release the conditional variable. */
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if (pthread_cond_destroy (&cond) != 0)
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/* This must never happen. */
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abort ();
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#endif
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/* If any of the I/O requests failed, return -1 and set errno. */
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if (result != 0)
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{
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__set_errno (result == EINTR ? EINTR : EIO);
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result = -1;
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}
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}
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else
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{
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struct async_waitlist *waitlist;
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waitlist = (struct async_waitlist *)
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malloc (sizeof (struct async_waitlist)
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+ (nent * sizeof (struct waitlist)));
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if (waitlist == NULL)
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{
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__set_errno (EAGAIN);
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result = -1;
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}
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else
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{
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total = 0;
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for (cnt = 0; cnt < nent; ++cnt)
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{
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assert (requests[cnt] == NULL || list[cnt] != NULL);
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if (requests[cnt] != NULL
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&& list[cnt]->aio_lio_opcode != LIO_NOP)
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{
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#ifndef DONT_NEED_AIO_MISC_COND
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waitlist->list[cnt].cond = NULL;
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#endif
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waitlist->list[cnt].result = NULL;
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waitlist->list[cnt].next = requests[cnt]->waiting;
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waitlist->list[cnt].counterp = &waitlist->counter;
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waitlist->list[cnt].sigevp = &waitlist->sigev;
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requests[cnt]->waiting = &waitlist->list[cnt];
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++total;
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}
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}
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waitlist->counter = total;
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waitlist->sigev = *sig;
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}
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}
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/* Release the mutex. */
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pthread_mutex_unlock (&__aio_requests_mutex);
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return result;
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}
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#if SHLIB_COMPAT (librt, GLIBC_2_1, GLIBC_2_4)
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int
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attribute_compat_text_section
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__lio_listio_21 (int mode, struct aiocb *const list[], int nent,
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struct sigevent *sig)
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{
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/* Check arguments. */
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if (mode != LIO_WAIT && mode != LIO_NOWAIT)
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{
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__set_errno (EINVAL);
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return -1;
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}
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return lio_listio_internal (mode | LIO_NO_INDIVIDUAL_EVENT, list, nent, sig);
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}
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compat_symbol (librt, __lio_listio_21, lio_listio, GLIBC_2_1);
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#endif
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int
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__lio_listio_item_notify (int mode, struct aiocb *const list[], int nent,
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struct sigevent *sig)
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{
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/* Check arguments. */
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if (mode != LIO_WAIT && mode != LIO_NOWAIT)
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{
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__set_errno (EINVAL);
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return -1;
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}
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return lio_listio_internal (mode, list, nent, sig);
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}
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versioned_symbol (librt, __lio_listio_item_notify, lio_listio, GLIBC_2_4);
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