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/* Copyright (C) 2019-2020 Free Software Foundation, Inc.
Contributed by Nicolas Koenig
This file is part of the GNU Fortran Native Coarray Library (libnca).
Libnca is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
Libnca 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 General Public License for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include "libgfortran.h"
#include "libcoarraynative.h"
#include <string.h>
static void
sync_all_init (counter_barrier *b)
{
master_bind_active_image_barrier (this_image.m, b);
}
static inline void
lock_table (sync_iface *si)
{
pthread_mutex_lock (&si->cis->table_lock);
}
static inline void
unlock_table (sync_iface *si)
{
pthread_mutex_unlock (&si->cis->table_lock);
}
static inline void
wait_table_cond (sync_iface *si, pthread_cond_t *cond)
{
pthread_cond_wait (cond, &si->cis->table_lock);
}
static int *
get_locked_table (sync_iface *si)
{
lock_table (si);
return si->table;
}
void
sync_iface_init (sync_iface *si, alloc_iface *ai, shared_memory *sm)
{
si->cis = SHMPTR_AS (
sync_iface_shared *,
shared_malloc (get_allocator (ai), sizeof (sync_iface_shared)), sm);
sync_all_init (&si->cis->sync_all);
initialize_shared_mutex (&si->cis->table_lock);
si->sm = sm;
si->a = get_allocator (ai);
si->cis->table = shared_malloc (si->a, sizeof (int) * local->total_num_images
* local->total_num_images);
si->cis->triggers = shared_malloc (si->a, sizeof (pthread_cond_t)
* local->total_num_images);
si->table = SHMPTR_AS (int *, si->cis->table, si->sm);
si->triggers = SHMPTR_AS (pthread_cond_t *, si->cis->triggers, si->sm);
for (int i = 0; i < local->total_num_images; i++)
initialize_shared_condition (&si->triggers[i]);
}
/* TODO: Maybe check whether synchronizing image is still alive. */
void
sync_table (sync_iface *si, int *images, int size)
{
#if defined(DEBUG_NATIVE_COARRAY) && DEBUG_NATIVE_COARRAY
dprintf (2,
"Image %d waiting for these %ld images: ", this_image.image_num + 1,
size);
for (int d_i = 0; (size_t)d_i < size; d_i++)
dprintf (2, "%d ", images[d_i]);
dprintf (2, "\n");
#endif
int i;
int done;
int *table = get_locked_table (si);
if (size > 0)
{
for (i = 0; i < size; i++)
{
table[images[i] - 1 + local->total_num_images * this_image.image_num]++;
pthread_cond_signal (&si->triggers[images[i] - 1]);
}
for (;;)
{
done = 1;
for (i = 0; i < size; i++)
done &= si->table[images[i] - 1
+ this_image.image_num * local->total_num_images]
== si->table[this_image.image_num
+ (images[i] - 1) * local->total_num_images];
if (done)
break;
wait_table_cond (si, &si->triggers[this_image.image_num]);
}
}
else
{
size = local->total_num_images;
for (i = 0; i < size; i++)
{
table[i + local->total_num_images * this_image.image_num]++;
pthread_cond_signal (&si->triggers[i]);
}
for (;;)
{
done = 1;
for (i = 0; i < size; i++)
done &= si->table[i + this_image.image_num * local->total_num_images]
== si->table[this_image.image_num
+ i * local->total_num_images];
if (done)
break;
wait_table_cond (si, &si->triggers[this_image.image_num]);
}
}
unlock_table (si);
}
void
sync_all (sync_iface *si)
{
counter_barrier_wait (&si->cis->sync_all);
}
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