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/* Copyright (C) 2015-2021 Free Software Foundation, Inc.
Contributed by Alexander Monakov <amonakov@ispras.ru>
This file is part of the GNU Offloading and Multi Processing Library
(libgomp).
Libgomp 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.
Libgomp 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/>. */
/* This is a simplified barrier that is suitable for thread pool
synchronizaton. Only a subset of full barrier API (bar.h) is exposed.
Here in the NVPTX-specific implementation, we expect that thread pool
corresponds to a PTX CTA (thread block). */
#ifndef GOMP_SIMPLE_BARRIER_H
#define GOMP_SIMPLE_BARRIER_H 1
typedef struct
{
unsigned count;
} gomp_simple_barrier_t;
static inline void
gomp_simple_barrier_init (gomp_simple_barrier_t *bar, unsigned count)
{
bar->count = count * 32;
}
/* Unused on NVPTX.
static inline void
gomp_simple_barrier_reinit (gomp_simple_barrier_t *bar, unsigned count)
{
bar->count = count * 32;
}
*/
static inline void
gomp_simple_barrier_destroy (gomp_simple_barrier_t *bar)
{
}
static inline void
gomp_simple_barrier_wait (gomp_simple_barrier_t *bar)
{
asm volatile ("bar.sync 0, %0;" : : "r" (bar->count) : "memory");
}
static inline void
gomp_simple_barrier_wait_last (gomp_simple_barrier_t *bar)
{
asm volatile ("bar.arrive 0, %0;" : : "r" (bar->count) : "memory");
}
#endif /* GOMP_SIMPLE_BARRIER_H */
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