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/* Copyright (C) 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 "util.h"
#include "counter_barrier.h"
#include <assert.h>
/* Lock the associated counter of this barrier. */
static inline void
lock_counter_barrier (counter_barrier *b)
{
pthread_mutex_lock (&b->count->m);
}
/* Unlock the associated counter of this barrier. */
static inline void
unlock_counter_barrier (counter_barrier *b)
{
pthread_mutex_unlock (&b->count->m);
}
/* Wait on the barrier. */
void
counter_barrier_wait (counter_barrier *b)
{
int initial_count;
int wait_group_beginning;
assert (b->count);
lock_counter_barrier (b);
wait_group_beginning = b->curr_wait_group;
if (--b->wait_count <= 0)
pthread_cond_broadcast (&b->cond);
else
{
while (b->wait_count > 0 && b->curr_wait_group == wait_group_beginning)
pthread_cond_wait (&b->cond, &b->count->m);
}
if (b->wait_count <= 0)
{
b->curr_wait_group = !wait_group_beginning;
b->wait_count = b->count->val;
}
unlock_counter_barrier (b);
}
/* Adjust the counter of a barrier by val (which can be positive or
negative), signalling if necessary. */
static inline void
change_internal_barrier_count (counter_barrier *b, int val)
{
b->wait_count += val;
if (b->wait_count <= 0)
pthread_cond_broadcast (&b->cond);
}
/* Adjust all associated barriers of a counter. */
int
waitable_counter_add (waitable_counter *c, int val)
{
counter_barrier *curr;
int ret;
pthread_mutex_lock (&c->m);
ret = (c->val += val);
for (curr = c->b; curr; curr = curr->next)
change_internal_barrier_count (curr, val);
pthread_mutex_unlock (&c->m);
return ret;
}
/* Get the value of a counter. */
int
waitable_counter_get_val (waitable_counter *c)
{
int ret;
pthread_mutex_lock (&c->m);
ret = c->val;
pthread_mutex_unlock (&c->m);
return ret;
}
/* Initialize waitable counter. */
void
waitable_counter_init (waitable_counter *c, int val)
{
initialize_shared_mutex (&c->m);
c->val = val;
c->b = NULL;
}
/* Bind a barrier to a counter. */
void
bind_counter_barrier (counter_barrier *b, waitable_counter *c)
{
initialize_shared_condition (&b->cond);
pthread_mutex_lock (&c->m);
b->next = c->b;
b->curr_wait_group = 0;
b->count = c;
b->wait_count = c->val;
c->b = b;
pthread_mutex_unlock (&c->m);
}
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