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Diffstat (limited to 'rtkaio/sysdeps/unix/sysv/linux/klio_listio.c')
-rw-r--r--rtkaio/sysdeps/unix/sysv/linux/klio_listio.c322
1 files changed, 322 insertions, 0 deletions
diff --git a/rtkaio/sysdeps/unix/sysv/linux/klio_listio.c b/rtkaio/sysdeps/unix/sysv/linux/klio_listio.c
new file mode 100644
index 0000000000..b7676c9f03
--- /dev/null
+++ b/rtkaio/sysdeps/unix/sysv/linux/klio_listio.c
@@ -0,0 +1,322 @@
+/* Enqueue and list of read or write requests.
+ Copyright (C) 1997,1998,1999,2000,2001,2002,2003,2005,2006
+ 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <kaio_misc.h>
+
+#ifndef USE_KAIO
+#include <lio_listio.c>
+#else
+
+#ifndef lio_listio
+#include <aio.h>
+#include <assert.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#define LIO_OPCODE_BASE 0
+#endif
+
+#include <shlib-compat.h>
+
+
+/* We need this special structure to handle asynchronous I/O. */
+struct async_waitlist
+ {
+ int counter;
+ struct sigevent sigev;
+ struct waitlist list[0];
+ };
+
+
+/* The code in glibc 2.1 to glibc 2.4 issued only one event when all
+ requests submitted with lio_listio finished. The existing practice
+ is to issue events for the individual requests as well. This is
+ what the new code does. */
+#if SHLIB_COMPAT (librt, GLIBC_2_1, GLIBC_2_4)
+# define LIO_MODE(mode) ((mode) & 127)
+# define NO_INDIVIDUAL_EVENT_P(mode) ((mode) & 128)
+#else
+# define LIO_MODE(mode) mode
+# define NO_INDIVIDUAL_EVENT_P(mode) 0
+#endif
+
+
+static int
+lio_listio_internal (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, op = 0;
+ kctx_t kctx = KCTX_NONE;
+
+ if (sig == NULL)
+ {
+ defsigev.sigev_notify = SIGEV_NONE;
+ sig = &defsigev;
+ }
+
+ /* Request the mutex. */
+ pthread_mutex_lock (&__aio_requests_mutex);
+
+ if (LIO_MODE (mode) == LIO_WAIT && ! __have_no_kernel_aio && nent > 0)
+ {
+ int res;
+ INTERNAL_SYSCALL_DECL (err);
+
+ kctx = 0;
+ do
+ res = INTERNAL_SYSCALL (io_setup, err, 2, nent, &kctx);
+ while (INTERNAL_SYSCALL_ERROR_P (res, err)
+ && INTERNAL_SYSCALL_ERRNO (res, err) == EINTR);
+ if (INTERNAL_SYSCALL_ERROR_P (res, err))
+ {
+ kctx = KCTX_NONE;
+ if (INTERNAL_SYSCALL_ERRNO (res, err) == ENOSYS)
+ __have_no_kernel_aio = 1;
+ }
+ }
+ else if (LIO_MODE (mode) == LIO_NOWAIT)
+ {
+ op = LIO_KTHREAD;
+ if (sig->sigev_notify != SIGEV_NONE)
+ op = LIO_KTHREAD | LIO_KTHREAD_REQUIRED;
+ }
+ op |= LIO_OPCODE_BASE;
+
+ /* 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)
+ {
+ if (NO_INDIVIDUAL_EVENT_P (mode))
+ list[cnt]->aio_sigevent.sigev_notify = SIGEV_NONE;
+ requests[cnt]
+ = __aio_enqueue_request_ctx ((aiocb_union *) list[cnt],
+ list[cnt]->aio_lio_opcode | op,
+ kctx);
+
+ 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. */
+
+ if (kctx != KCTX_NONE)
+ {
+ INTERNAL_SYSCALL_DECL (err);
+ INTERNAL_SYSCALL (io_destroy, err, 1, kctx);
+ }
+
+ /* 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 (LIO_MODE (mode) == LIO_NOWAIT)
+ {
+#ifdef BROKEN_THREAD_SIGNALS
+ __aio_notify_only (sig,
+ sig->sigev_notify == SIGEV_SIGNAL ? getpid () : 0);
+#else
+ __aio_notify_only (sig);
+#endif
+ }
+
+ return result;
+ }
+ else if (LIO_MODE (mode) == LIO_WAIT)
+ {
+#ifndef DONT_NEED_AIO_MISC_COND
+ pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
+ int oldstate;
+#endif
+ struct waitlist waitlist[nent];
+ volatile int ktotal = 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)
+ {
+ if (requests[cnt]->kioctx != KCTX_NONE)
+ {
+ assert (requests[cnt]->kioctx == kctx);
+ waitlist[cnt].counterp = &ktotal;
+ ++ktotal;
+ }
+ else
+ {
+ waitlist[cnt].counterp = &total;
+ ++total;
+ }
+#ifndef DONT_NEED_AIO_MISC_COND
+ waitlist[cnt].cond = &cond;
+#endif
+ waitlist[cnt].result = &result;
+ waitlist[cnt].next = requests[cnt]->waiting;
+ waitlist[cnt].sigevp = NULL;
+#ifdef BROKEN_THREAD_SIGNALS
+ waitlist[cnt].caller_pid = 0; /* Not needed. */
+#endif
+ requests[cnt]->waiting = &waitlist[cnt];
+ }
+ }
+
+ while (ktotal > 0)
+ __aio_wait_for_events (kctx, NULL);
+#ifdef DONT_NEED_AIO_MISC_COND
+ AIO_MISC_WAIT (result, total, NULL, 0);
+#else
+ /* Since `pthread_cond_wait'/`pthread_cond_timedwait' are cancellation
+ points we must be careful. We added entries to the waiting lists
+ which we must remove. So defer cancellation 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 cancellation state. */
+ pthread_setcancelstate (oldstate, NULL);
+
+ /* Release the conditional variable. */
+ if (pthread_cond_destroy (&cond) != 0)
+ /* This must never happen. */
+ abort ();
+#endif
+
+ if (kctx != KCTX_NONE)
+ {
+ INTERNAL_SYSCALL_DECL (err);
+ INTERNAL_SYSCALL (io_destroy, err, 1, kctx);
+ }
+
+ /* If any of the I/O requests failed, return -1 and set errno. */
+ if (result != 0)
+ {
+ __set_errno (result == EINTR ? EINTR : EIO);
+ result = -1;
+ }
+ }
+ else if (sig->sigev_notify != SIGEV_NONE)
+ {
+ 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
+ {
+#ifdef BROKEN_THREAD_SIGNALS
+ pid_t caller_pid = sig->sigev_notify == SIGEV_SIGNAL ? getpid () : 0;
+#endif
+ 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)
+ {
+#ifndef DONT_NEED_AIO_MISC_COND
+ waitlist->list[cnt].cond = NULL;
+#endif
+ waitlist->list[cnt].result = NULL;
+ waitlist->list[cnt].next = requests[cnt]->waiting;
+ waitlist->list[cnt].counterp = &waitlist->counter;
+ waitlist->list[cnt].sigevp = &waitlist->sigev;
+#ifdef BROKEN_THREAD_SIGNALS
+ waitlist->list[cnt].caller_pid = caller_pid;
+#endif
+ requests[cnt]->waiting = &waitlist->list[cnt];
+ ++total;
+ }
+ }
+
+ waitlist->counter = total;
+ waitlist->sigev = *sig;
+ }
+ }
+
+ /* Release the mutex. */
+ pthread_mutex_unlock (&__aio_requests_mutex);
+
+ return result;
+}
+
+
+#if SHLIB_COMPAT (librt, GLIBC_2_1, GLIBC_2_4)
+int
+attribute_compat_text_section
+__lio_listio_21 (int mode, struct aiocb *const list[], int nent,
+ struct sigevent *sig)
+{
+ /* Check arguments. */
+ if (mode != LIO_WAIT && mode != LIO_NOWAIT)
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+ return lio_listio_internal (mode | LIO_NO_INDIVIDUAL_EVENT, list, nent, sig);
+}
+compat_symbol (librt, __lio_listio_21, lio_listio, GLIBC_2_1);
+#endif
+
+
+int
+__lio_listio_item_notify (int mode, struct aiocb *const list[], int nent,
+ struct sigevent *sig)
+{
+ /* Check arguments. */
+ if (mode != LIO_WAIT && mode != LIO_NOWAIT)
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+ return lio_listio_internal (mode, list, nent, sig);
+}
+versioned_symbol (librt, __lio_listio_item_notify, lio_listio, GLIBC_2_4);
+
+#endif
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