-/* Handle general operations.
- Copyright (C) 1997 Free Software Foundation, Inc.
+/* Handle general operations. Stub version.
+ Copyright (C) 2001-2019 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.
+ 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
- Library General Public License for more details.
+ Lesser 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. */
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
#include <aio.h>
-#include <errno.h>
-#include <pthread.h>
-#include <semaphore.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <sys/stat.h>
+#include <aio_misc.h>
-#include "aio_misc.h"
+/* This file is for internal code needed by the aio_* implementation. */
-
-/* We need a list of pending operations. This is sorted according to
- the priority given in the aio_reqprio member. */
-aiocb_union *__aio_requests;
-
-/* Since the list is global we need a semaphore protecting it. */
-sem_t __aio_requests_sema;
-
-
-/* The initialization function. It gets automatically called if any
- aio_* function is used in the program. */
-static void
-__attribute__ ((unused))
-aio_initialize (void)
-{
- /* Initialize the semaphore. We allow exactly one user at a time. */
- sem_init (&__aio_requests_sema, 0, 1);
-}
-
-text_set_element (__libc_subinit, aio_initialize);
-
-
-/* The thread handler. */
-static void *handle_fildes_io (void *arg);
-
-
-/* The main function of the async I/O handling. It enqueues requests
- and if necessary starts and handles threads. */
-int
-__aio_enqueue_request (aiocb_union *aiocbp, int operation, int require_lock)
+void
+__aio_init (const struct aioinit *init)
{
- int result;
- int policy, prio;
- struct sched_param param;
- aiocb_union *runp;
-
- if (aiocbp->aiocb.aio_reqprio < 0
- || aiocbp->aiocb.aio_reqprio > AIO_PRIO_DELTA_MAX)
- {
- /* Invalid priority value. */
- __set_errno (EINVAL);
- aiocbp->aiocb.__error_code = EINVAL;
- aiocbp->aiocb.__return_value = -1;
- return -1;
- }
-
- if (pthread_getschedparam (pthread_self (), &policy, ¶m) < 0)
- {
- /* Something went wrong. */
- aiocbp->aiocb.__error_code = errno;
- aiocbp->aiocb.__return_value = -1;
- return -1;
- }
-
- /* Compute priority for this request. */
- prio = param.sched_priority - aiocbp->aiocb.aio_reqprio;
-
-
- /* Get the semaphore. */
- if (require_lock)
- sem_wait (&__aio_requests_sema);
-
- runp = __aio_requests;
- /* First look whether the current file descriptor is currently
- worked with. */
- while (runp != NULL && runp->aiocb.aio_fildes < aiocbp->aiocb.aio_fildes)
- runp = (aiocb_union *) runp->aiocb.__next_fd;
-
- if (runp != NULL)
- {
- /* The current file descriptor is worked on. It makes no sense
- to start another thread since this new thread would have to
- wait for the previous one to terminate. Simply enqueue it
- after the running one according to the priority. */
- while (runp->aiocb.__next_prio != NULL
- && runp->aiocb.__next_prio->__abs_prio >= prio)
- runp = (aiocb_union *) runp->aiocb.__next_prio;
-
- aiocbp->aiocb.__next_prio = runp->aiocb.__next_prio;
- aiocbp->aiocb.__abs_prio = prio;
- aiocbp->aiocb.__policy = policy;
- aiocbp->aiocb.aio_lio_opcode = operation;
- aiocbp->aiocb.__error_code = EINPROGRESS;
- aiocbp->aiocb.__return_value = 0;
- runp->aiocb.__next_prio = (struct aiocb *) aiocbp;
-
- result = 0;
- }
- else
- {
- /* We create a new thread for this file descriptor. The
- function which gets called will handle all available requests
- for this descriptor and when all are processed it will
- terminate. */
- pthread_t thid;
- pthread_attr_t attr;
-
- /* First enqueue the request (the list is empty). */
- aiocbp->aiocb.__next_fd = NULL;
- aiocbp->aiocb.__last_fd = NULL;
-
- aiocbp->aiocb.__next_prio = NULL;
- aiocbp->aiocb.__abs_prio = prio;
- aiocbp->aiocb.__policy = policy;
- aiocbp->aiocb.aio_lio_opcode = operation;
- aiocbp->aiocb.__error_code = EINPROGRESS;
- aiocbp->aiocb.__return_value = 0;
-
- /* Make sure the thread is created detached. */
- pthread_attr_init (&attr);
- pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
-
- /* Now try to start a thread. */
- if (pthread_create (&thid, &attr, handle_fildes_io, aiocbp) < 0)
- {
- result = -1;
- aiocbp->aiocb.__error_code = errno;
- aiocbp->aiocb.__return_value = -1;
- }
- else
- /* We managed to enqueue the request. All errors which can
- happen now can be recognized by calls to `aio_return' and
- `aio_error'. */
- result = 0;
- }
-
- /* Release the semaphore. */
- if (require_lock)
- sem_post (&__aio_requests_sema);
-
- return result;
-}
-
-
-static void *
-handle_fildes_io (void *arg)
-{
- pthread_t self = pthread_self ();
- struct sched_param param;
- aiocb_union *runp = (aiocb_union *) arg;
- int policy;
- int fildes = runp->aiocb.aio_fildes; /* This is always the same. */
-
- pthread_getschedparam (self, &policy, ¶m);
-
- do
- {
- /* Change the priority to the requested value (if necessary). */
- if (runp->aiocb.__abs_prio != param.sched_priority
- || runp->aiocb.__policy != policy)
- {
- param.sched_priority = runp->aiocb.__abs_prio;
- policy = runp->aiocb.__policy;
- pthread_setschedparam (self, policy, ¶m);
- }
-
- /* Process request pointed to by RUNP. We must not be disturbed
- by signals. */
- if ((runp->aiocb.aio_lio_opcode & 127) == LIO_READ)
- {
- if (runp->aiocb.aio_lio_opcode & 128)
- runp->aiocb.__return_value =
- TEMP_FAILURE_RETRY (__pread64 (fildes,
- (void *) runp->aiocb64.aio_buf,
- runp->aiocb64.aio_nbytes,
- runp->aiocb64.aio_offset));
- else
- runp->aiocb.__return_value =
- TEMP_FAILURE_RETRY (__pread (fildes,
- (void *) runp->aiocb.aio_buf,
- runp->aiocb.aio_nbytes,
- runp->aiocb.aio_offset));
- }
- else if ((runp->aiocb.aio_lio_opcode & 127) == LIO_WRITE)
- {
- if (runp->aiocb.aio_lio_opcode & 128)
- runp->aiocb.__return_value =
- TEMP_FAILURE_RETRY (__pwrite64 (fildes,
- (const void *) runp->aiocb64.aio_buf,
- runp->aiocb64.aio_nbytes,
- runp->aiocb64.aio_offset));
- else
- runp->aiocb.__return_value =
- TEMP_FAILURE_RETRY (__pwrite (fildes,
- (const void *) runp->aiocb.aio_buf,
- runp->aiocb.aio_nbytes,
- runp->aiocb.aio_offset));
- }
- else if (runp->aiocb.aio_lio_opcode == __LIO_DSYNC)
- runp->aiocb.__return_value = TEMP_FAILURE_RETRY (fdatasync (fildes));
- else if (runp->aiocb.aio_lio_opcode == __LIO_SYNC)
- runp->aiocb.__return_value = TEMP_FAILURE_RETRY (fsync (fildes));
- else
- {
- /* This is an invalid opcode. */
- runp->aiocb.__return_value = -1;
- __set_errno (EINVAL);
- }
-
- if (runp->aiocb.__return_value == -1)
- runp->aiocb.__error_code = errno;
- else
- runp->aiocb.__error_code = 0;
-
- /* Send the signal to notify about finished processing of the
- request. */
- if (runp->aiocb.aio_sigevent.sigev_notify == SIGEV_THREAD)
- {
- /* We have to start a thread. */
- pthread_t tid;
- pthread_attr_t attr, *pattr;
-
- pattr = (pthread_attr_t *)
- runp->aiocb.aio_sigevent.sigev_notify_attributes;
- if (pattr == NULL)
- {
- pthread_attr_init (&attr);
- pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
- pattr = &attr;
- }
-
- if (pthread_create (&tid,
- (pthread_attr_t *)
- runp->aiocb.aio_sigevent.sigev_notify_attributes,
- (void *(*) (void *))
- runp->aiocb.aio_sigevent.sigev_notify_function,
- runp->aiocb.aio_sigevent.sigev_value.sival_ptr)
- < 0)
- {
- /* XXX What shall we do if already an error is set by
- read/write/fsync? */
- runp->aiocb.__error_code = errno;
- runp->aiocb.__return_value = -1;
- }
- }
- else if (runp->aiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL)
- /* We have to send a signal. */
- if (__aio_sigqueue (runp->aiocb.aio_sigevent.sigev_signo,
- runp->aiocb.aio_sigevent.sigev_value) < 0)
- {
- /* XXX What shall we do if already an error is set by
- read/write/fsync? */
- runp->aiocb.__error_code = errno;
- runp->aiocb.__return_value = -1;
- }
-
- /* Get the semaphore. */
- sem_wait (&__aio_requests_sema);
-
- /* Now dequeue the current request. */
- if (runp->aiocb.__next_prio == NULL)
- {
- if (runp->aiocb.__next_fd != NULL)
- runp->aiocb.__next_fd->__last_fd = runp->aiocb.__last_fd;
- if (runp->aiocb.__last_fd != NULL)
- runp->aiocb.__last_fd->__next_fd = runp->aiocb.__next_fd;
- runp = NULL;
- }
- else
- {
- runp->aiocb.__next_prio->__last_fd = runp->aiocb.__last_fd;
- runp->aiocb.__next_prio->__next_fd = runp->aiocb.__next_fd;
- if (runp->aiocb.__next_fd != NULL)
- runp->aiocb.__next_fd->__last_fd = runp->aiocb.__next_prio;
- if (runp->aiocb.__last_fd != NULL)
- runp->aiocb.__last_fd->__next_fd = runp->aiocb.__next_prio;
- runp = (aiocb_union *) runp->aiocb.__next_prio;
- }
-
- /* Release the semaphore. */
- sem_post (&__aio_requests_sema);
- }
- while (runp != NULL);
-
- pthread_exit (NULL);
}
+weak_alias (__aio_init, aio_init)
projects / thirdparty / glibc.git / blobdiff