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-rw-r--r--rt/aio_notify.c97
1 files changed, 97 insertions, 0 deletions
diff --git a/rt/aio_notify.c b/rt/aio_notify.c
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+/* Notify initiator of AIO request.
+ Copyright (C) 1997 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 <pthread.h>
+#include <stdlib.h>
+#include "aio_misc.h"
+
+int
+__aio_notify_only (struct sigevent *sigev)
+{
+ 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;
+ }
+
+ if (pthread_create (&tid, pattr,
+ (void *(*) (void *)) sigev->sigev_notify_function,
+ sigev->sigev_value.sival_ptr) < 0)
+ result = -1;
+ }
+ else if (sigev->sigev_notify == SIGEV_SIGNAL)
+ /* We have to send a signal. */
+ if (__aio_sigqueue (sigev->sigev_signo, sigev->sigev_value) < 0)
+ result = -1;
+
+ 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;
+
+ /* Decrement the counter. This is used in both cases. */
+ --*waitlist->counterp;
+
+ if (waitlist->sigevp == NULL)
+ pthread_cond_signal (waitlist->cond);
+ else
+ /* This is part of a 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;
+ }
+}