572 lines
12 KiB
C
572 lines
12 KiB
C
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/* Copyright (C) 2018-2022 Free Software Foundation, Inc.
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Contributed by Nicolas Koenig
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This file is part of the GNU Fortran runtime library (libgfortran).
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Libgfortran is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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Libgfortran 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
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "libgfortran.h"
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#define _GTHREAD_USE_COND_INIT_FUNC
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#include "../../libgcc/gthr.h"
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#include "io.h"
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#include "fbuf.h"
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#include "format.h"
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#include "unix.h"
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#include <string.h>
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#include <assert.h>
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#include <sys/types.h>
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#include "async.h"
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#if ASYNC_IO
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DEBUG_LINE (__thread const char *aio_prefix = MPREFIX);
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DEBUG_LINE (__gthread_mutex_t debug_queue_lock = __GTHREAD_MUTEX_INIT;)
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DEBUG_LINE (aio_lock_debug *aio_debug_head = NULL;)
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/* Current unit for asynchronous I/O. Needed for error reporting. */
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__thread gfc_unit *thread_unit = NULL;
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/* Queue entry for the asynchronous I/O entry. */
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typedef struct transfer_queue
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{
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enum aio_do type;
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struct transfer_queue *next;
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struct st_parameter_dt *new_pdt;
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transfer_args arg;
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_Bool has_id;
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int read_flag;
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} transfer_queue;
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struct error {
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st_parameter_dt *dtp;
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int id;
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};
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/* Helper function to exchange the old vs. a new PDT. */
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static void
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update_pdt (st_parameter_dt **old, st_parameter_dt *new) {
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st_parameter_dt *temp;
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NOTE ("Changing pdts, current_unit = %p", (void *) (new->u.p.current_unit));
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temp = *old;
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*old = new;
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if (temp)
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free (temp);
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}
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/* Destroy an adv_cond structure. */
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static void
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destroy_adv_cond (struct adv_cond *ac)
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{
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T_ERROR (__gthread_cond_destroy, &ac->signal);
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}
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/* Function invoked as start routine for a new asynchronous I/O unit.
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Contains the main loop for accepting requests and handling them. */
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static void *
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async_io (void *arg)
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{
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DEBUG_LINE (aio_prefix = TPREFIX);
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transfer_queue *ctq = NULL, *prev = NULL;
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gfc_unit *u = (gfc_unit *) arg;
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async_unit *au = u->au;
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LOCK (&au->lock);
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thread_unit = u;
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au->thread = __gthread_self ();
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while (true)
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{
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/* Main loop. At this point, au->lock is always held. */
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WAIT_SIGNAL_MUTEX (&au->work, au->tail != NULL, &au->lock);
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LOCK (&au->lock);
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ctq = au->head;
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prev = NULL;
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/* Loop over the queue entries until they are finished. */
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while (ctq)
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{
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if (prev)
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free (prev);
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prev = ctq;
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if (!au->error.has_error)
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{
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UNLOCK (&au->lock);
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switch (ctq->type)
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{
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case AIO_WRITE_DONE:
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NOTE ("Finalizing write");
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st_write_done_worker (au->pdt, false);
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UNLOCK (&au->io_lock);
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break;
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case AIO_READ_DONE:
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NOTE ("Finalizing read");
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st_read_done_worker (au->pdt, false);
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UNLOCK (&au->io_lock);
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break;
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case AIO_DATA_TRANSFER_INIT:
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NOTE ("Data transfer init");
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LOCK (&au->io_lock);
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update_pdt (&au->pdt, ctq->new_pdt);
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data_transfer_init_worker (au->pdt, ctq->read_flag);
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break;
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case AIO_TRANSFER_SCALAR:
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NOTE ("Starting scalar transfer");
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ctq->arg.scalar.transfer (au->pdt, ctq->arg.scalar.arg_bt,
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ctq->arg.scalar.data,
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ctq->arg.scalar.i,
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ctq->arg.scalar.s1,
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ctq->arg.scalar.s2);
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break;
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case AIO_TRANSFER_ARRAY:
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NOTE ("Starting array transfer");
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NOTE ("ctq->arg.array.desc = %p",
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(void *) (ctq->arg.array.desc));
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transfer_array_inner (au->pdt, ctq->arg.array.desc,
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ctq->arg.array.kind,
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ctq->arg.array.charlen);
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free (ctq->arg.array.desc);
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break;
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case AIO_CLOSE:
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NOTE ("Received AIO_CLOSE");
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LOCK (&au->lock);
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goto finish_thread;
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default:
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internal_error (NULL, "Invalid queue type");
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break;
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}
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LOCK (&au->lock);
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if (unlikely (au->error.has_error))
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au->error.last_good_id = au->id.low - 1;
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}
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else
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{
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if (ctq->type == AIO_WRITE_DONE || ctq->type == AIO_READ_DONE)
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{
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UNLOCK (&au->io_lock);
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}
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else if (ctq->type == AIO_CLOSE)
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{
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NOTE ("Received AIO_CLOSE during error condition");
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goto finish_thread;
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}
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}
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NOTE ("Next ctq, current id: %d", au->id.low);
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if (ctq->has_id && au->id.waiting == au->id.low++)
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SIGNAL (&au->id.done);
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ctq = ctq->next;
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}
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au->tail = NULL;
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au->head = NULL;
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au->empty = 1;
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SIGNAL (&au->emptysignal);
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}
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finish_thread:
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au->tail = NULL;
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au->head = NULL;
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au->empty = 1;
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SIGNAL (&au->emptysignal);
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free (ctq);
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UNLOCK (&au->lock);
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return NULL;
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}
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/* Free an asynchronous unit. */
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static void
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free_async_unit (async_unit *au)
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{
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if (au->tail)
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internal_error (NULL, "Trying to free nonempty asynchronous unit");
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destroy_adv_cond (&au->work);
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destroy_adv_cond (&au->emptysignal);
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destroy_adv_cond (&au->id.done);
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T_ERROR (__gthread_mutex_destroy, &au->lock);
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free (au);
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}
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/* Initialize an adv_cond structure. */
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static void
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init_adv_cond (struct adv_cond *ac)
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{
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ac->pending = 0;
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__GTHREAD_COND_INIT_FUNCTION (&ac->signal);
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}
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/* Initialize an asyncronous unit, returning zero on success,
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nonzero on failure. It also sets u->au. */
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void
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init_async_unit (gfc_unit *u)
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{
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async_unit *au;
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if (!__gthread_active_p ())
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{
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u->au = NULL;
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return;
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}
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au = (async_unit *) xmalloc (sizeof (async_unit));
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u->au = au;
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init_adv_cond (&au->work);
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init_adv_cond (&au->emptysignal);
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__GTHREAD_MUTEX_INIT_FUNCTION (&au->lock);
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__GTHREAD_MUTEX_INIT_FUNCTION (&au->io_lock);
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LOCK (&au->lock);
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T_ERROR (__gthread_create, &au->thread, &async_io, (void *) u);
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au->pdt = NULL;
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au->head = NULL;
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au->tail = NULL;
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au->empty = true;
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au->id.waiting = -1;
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au->id.low = 0;
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au->id.high = 0;
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au->error.fatal_error = 0;
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au->error.has_error = 0;
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au->error.last_good_id = 0;
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init_adv_cond (&au->id.done);
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UNLOCK (&au->lock);
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}
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/* Enqueue a transfer statement. */
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void
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enqueue_transfer (async_unit *au, transfer_args *arg, enum aio_do type)
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{
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transfer_queue *tq = calloc (sizeof (transfer_queue), 1);
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tq->arg = *arg;
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tq->type = type;
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tq->has_id = 0;
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LOCK (&au->lock);
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if (!au->tail)
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au->head = tq;
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else
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au->tail->next = tq;
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au->tail = tq;
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REVOKE_SIGNAL (&(au->emptysignal));
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au->empty = false;
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SIGNAL (&au->work);
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UNLOCK (&au->lock);
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}
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/* Enqueue an st_write_done or st_read_done which contains an ID. */
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int
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enqueue_done_id (async_unit *au, enum aio_do type)
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{
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int ret;
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transfer_queue *tq = calloc (sizeof (transfer_queue), 1);
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tq->type = type;
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tq->has_id = 1;
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LOCK (&au->lock);
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if (!au->tail)
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au->head = tq;
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else
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au->tail->next = tq;
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au->tail = tq;
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REVOKE_SIGNAL (&(au->emptysignal));
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au->empty = false;
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ret = au->id.high++;
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NOTE ("Enqueue id: %d", ret);
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SIGNAL (&au->work);
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UNLOCK (&au->lock);
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return ret;
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}
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/* Enqueue an st_write_done or st_read_done without an ID. */
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void
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enqueue_done (async_unit *au, enum aio_do type)
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{
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transfer_queue *tq = calloc (sizeof (transfer_queue), 1);
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tq->type = type;
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tq->has_id = 0;
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LOCK (&au->lock);
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if (!au->tail)
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au->head = tq;
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else
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au->tail->next = tq;
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au->tail = tq;
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REVOKE_SIGNAL (&(au->emptysignal));
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au->empty = false;
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SIGNAL (&au->work);
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UNLOCK (&au->lock);
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}
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/* Enqueue a CLOSE statement. */
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void
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enqueue_close (async_unit *au)
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{
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transfer_queue *tq = calloc (sizeof (transfer_queue), 1);
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tq->type = AIO_CLOSE;
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LOCK (&au->lock);
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if (!au->tail)
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au->head = tq;
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else
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au->tail->next = tq;
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au->tail = tq;
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REVOKE_SIGNAL (&(au->emptysignal));
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au->empty = false;
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SIGNAL (&au->work);
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UNLOCK (&au->lock);
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}
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/* The asynchronous unit keeps the currently active PDT around.
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This function changes that to the current one. */
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void
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enqueue_data_transfer_init (async_unit *au, st_parameter_dt *dt, int read_flag)
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{
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st_parameter_dt *new = xmalloc (sizeof (st_parameter_dt));
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transfer_queue *tq = xmalloc (sizeof (transfer_queue));
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memcpy ((void *) new, (void *) dt, sizeof (st_parameter_dt));
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NOTE ("dt->internal_unit_desc = %p", dt->internal_unit_desc);
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NOTE ("common.flags & mask = %d", dt->common.flags & IOPARM_LIBRETURN_MASK);
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tq->next = NULL;
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tq->type = AIO_DATA_TRANSFER_INIT;
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tq->read_flag = read_flag;
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tq->has_id = 0;
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tq->new_pdt = new;
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LOCK (&au->lock);
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if (!au->tail)
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au->head = tq;
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else
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au->tail->next = tq;
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au->tail = tq;
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REVOKE_SIGNAL (&(au->emptysignal));
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au->empty = false;
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SIGNAL (&au->work);
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UNLOCK (&au->lock);
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}
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/* Collect the errors that may have happened asynchronously. Return true if
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an error has been encountered. */
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bool
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collect_async_errors (st_parameter_common *cmp, async_unit *au)
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{
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bool has_error = au->error.has_error;
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if (has_error)
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{
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||
|
|
if (generate_error_common (cmp, au->error.family, au->error.message))
|
||
|
|
{
|
||
|
|
au->error.has_error = 0;
|
||
|
|
au->error.cmp = NULL;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
/* The program will exit later. */
|
||
|
|
au->error.fatal_error = true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return has_error;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Perform a wait operation on an asynchronous unit with an ID specified,
|
||
|
|
which means collecting the errors that may have happened asynchronously.
|
||
|
|
Return true if an error has been encountered. */
|
||
|
|
|
||
|
|
bool
|
||
|
|
async_wait_id (st_parameter_common *cmp, async_unit *au, int i)
|
||
|
|
{
|
||
|
|
bool ret;
|
||
|
|
|
||
|
|
if (au == NULL)
|
||
|
|
return false;
|
||
|
|
|
||
|
|
if (cmp == NULL)
|
||
|
|
cmp = au->error.cmp;
|
||
|
|
|
||
|
|
if (au->error.has_error)
|
||
|
|
{
|
||
|
|
if (i <= au->error.last_good_id)
|
||
|
|
return false;
|
||
|
|
|
||
|
|
return collect_async_errors (cmp, au);
|
||
|
|
}
|
||
|
|
|
||
|
|
LOCK (&au->lock);
|
||
|
|
if (i > au->id.high)
|
||
|
|
{
|
||
|
|
generate_error_common (cmp, LIBERROR_BAD_WAIT_ID, NULL);
|
||
|
|
UNLOCK (&au->lock);
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
NOTE ("Waiting for id %d", i);
|
||
|
|
if (au->id.waiting < i)
|
||
|
|
au->id.waiting = i;
|
||
|
|
SIGNAL (&(au->work));
|
||
|
|
WAIT_SIGNAL_MUTEX (&(au->id.done),
|
||
|
|
(au->id.low >= au->id.waiting || au->empty), &au->lock);
|
||
|
|
LOCK (&au->lock);
|
||
|
|
ret = collect_async_errors (cmp, au);
|
||
|
|
UNLOCK (&au->lock);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Perform a wait operation an an asynchronous unit without an ID. */
|
||
|
|
|
||
|
|
bool
|
||
|
|
async_wait (st_parameter_common *cmp, async_unit *au)
|
||
|
|
{
|
||
|
|
bool ret;
|
||
|
|
|
||
|
|
if (au == NULL)
|
||
|
|
return false;
|
||
|
|
|
||
|
|
if (cmp == NULL)
|
||
|
|
cmp = au->error.cmp;
|
||
|
|
|
||
|
|
LOCK (&(au->lock));
|
||
|
|
SIGNAL (&(au->work));
|
||
|
|
|
||
|
|
if (au->empty)
|
||
|
|
{
|
||
|
|
ret = collect_async_errors (cmp, au);
|
||
|
|
UNLOCK (&au->lock);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
WAIT_SIGNAL_MUTEX (&(au->emptysignal), (au->empty), &au->lock);
|
||
|
|
ret = collect_async_errors (cmp, au);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Close an asynchronous unit. */
|
||
|
|
|
||
|
|
void
|
||
|
|
async_close (async_unit *au)
|
||
|
|
{
|
||
|
|
if (au == NULL)
|
||
|
|
return;
|
||
|
|
|
||
|
|
NOTE ("Closing async unit");
|
||
|
|
enqueue_close (au);
|
||
|
|
T_ERROR (__gthread_join, au->thread, NULL);
|
||
|
|
free_async_unit (au);
|
||
|
|
}
|
||
|
|
|
||
|
|
#else
|
||
|
|
|
||
|
|
/* Only set u->au to NULL so no async I/O will happen. */
|
||
|
|
|
||
|
|
void
|
||
|
|
init_async_unit (gfc_unit *u)
|
||
|
|
{
|
||
|
|
u->au = NULL;
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Do-nothing function, which will not be called. */
|
||
|
|
|
||
|
|
void
|
||
|
|
enqueue_transfer (async_unit *au, transfer_args *arg, enum aio_do type)
|
||
|
|
{
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Do-nothing function, which will not be called. */
|
||
|
|
|
||
|
|
int
|
||
|
|
enqueue_done_id (async_unit *au, enum aio_do type)
|
||
|
|
{
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Do-nothing function, which will not be called. */
|
||
|
|
|
||
|
|
void
|
||
|
|
enqueue_done (async_unit *au, enum aio_do type)
|
||
|
|
{
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Do-nothing function, which will not be called. */
|
||
|
|
|
||
|
|
void
|
||
|
|
enqueue_close (async_unit *au)
|
||
|
|
{
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Do-nothing function, which will not be called. */
|
||
|
|
|
||
|
|
void
|
||
|
|
enqueue_data_transfer_init (async_unit *au, st_parameter_dt *dt, int read_flag)
|
||
|
|
{
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Do-nothing function, which will not be called. */
|
||
|
|
|
||
|
|
bool
|
||
|
|
collect_async_errors (st_parameter_common *cmp, async_unit *au)
|
||
|
|
{
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Do-nothing function, which will not be called. */
|
||
|
|
|
||
|
|
bool
|
||
|
|
async_wait_id (st_parameter_common *cmp, async_unit *au, int i)
|
||
|
|
{
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Do-nothing function, which will not be called. */
|
||
|
|
|
||
|
|
bool
|
||
|
|
async_wait (st_parameter_common *cmp, async_unit *au)
|
||
|
|
{
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Do-nothing function, which will not be called. */
|
||
|
|
|
||
|
|
void
|
||
|
|
async_close (async_unit *au)
|
||
|
|
{
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|