b3d14b3aa3
2019-11-13 Andrew Stubbs <ams@codesourcery.com> libgomp/ * configure.tgt (nvptx*-*-*): Add "accel" directory. * config/nvptx/libgomp-plugin.c: Move ... * config/accel/libgomp-plugin.c: ... to here. * config/nvptx/lock.c: Move ... * config/accel/lock.c: ... to here. * config/nvptx/mutex.c: Move ... * config/accel/mutex.c: ... to here. * config/nvptx/mutex.h: Move ... * config/accel/mutex.h: ... to here. * config/nvptx/oacc-async.c: Move ... * config/accel/oacc-async.c: ... to here. * config/nvptx/oacc-cuda.c: Move ... * config/accel/oacc-cuda.c: ... to here. * config/nvptx/oacc-host.c: Move ... * config/accel/oacc-host.c: ... to here. * config/nvptx/oacc-init.c: Move ... * config/accel/oacc-init.c: ... to here. * config/nvptx/oacc-mem.c: Move ... * config/accel/oacc-mem.c: ... to here. * config/nvptx/oacc-plugin.c: Move ... * config/accel/oacc-plugin.c: ... to here. * config/nvptx/omp-lock.h: Move ... * config/accel/omp-lock.h: ... to here. * config/nvptx/openacc.f90: Move ... * config/accel/openacc.f90: ... to here. * config/nvptx/pool.h: Move ... * config/accel/pool.h: ... to here. * config/nvptx/proc.c: Move ... * config/accel/proc.c: ... to here. * config/nvptx/ptrlock.c: Move ... * config/accel/ptrlock.c: ... to here. * config/nvptx/ptrlock.h: Move ... * config/accel/ptrlock.h: ... to here. * config/nvptx/sem.c: Move ... * config/accel/sem.c: ... to here. * config/nvptx/sem.h: Move ... * config/accel/sem.h: ... to here. * config/nvptx/thread-stacksize.h: Move ... * config/accel/thread-stacksize.h: ... to here. From-SVN: r278132
74 lines
2.4 KiB
C
74 lines
2.4 KiB
C
/* Copyright (C) 2015-2019 Free Software Foundation, Inc.
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Contributed by Alexander Monakov <amonakov@ispras.ru>
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This file is part of the GNU Offloading and Multi Processing Library
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(libgomp).
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Libgomp is free software; you can redistribute it and/or modify it
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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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Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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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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/* This is an NVPTX specific implementation of a mutex synchronization
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mechanism for libgomp. This type is private to the library. This
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implementation uses atomic instructions and busy waiting.
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A ptrlock has four states:
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0/NULL Initial
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1 Owned by me, I get to write a pointer to ptrlock.
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2 Some thread is waiting on the ptrlock.
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>2 Ptrlock contains a valid pointer.
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It is not valid to gain the ptrlock and then write a NULL to it. */
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#ifndef GOMP_PTRLOCK_H
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#define GOMP_PTRLOCK_H 1
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typedef void *gomp_ptrlock_t;
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static inline void gomp_ptrlock_init (gomp_ptrlock_t *ptrlock, void *ptr)
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{
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*ptrlock = ptr;
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}
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static inline void *gomp_ptrlock_get (gomp_ptrlock_t *ptrlock)
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{
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uintptr_t v = (uintptr_t) __atomic_load_n (ptrlock, MEMMODEL_ACQUIRE);
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if (v > 2)
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return (void *) v;
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if (v == 0
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&& __atomic_compare_exchange_n (ptrlock, &v, 1, false,
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MEMMODEL_ACQUIRE, MEMMODEL_ACQUIRE))
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return NULL;
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while (v == 1)
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v = (uintptr_t) __atomic_load_n (ptrlock, MEMMODEL_ACQUIRE);
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return (void *) v;
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}
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static inline void gomp_ptrlock_set (gomp_ptrlock_t *ptrlock, void *ptr)
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{
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__atomic_store_n (ptrlock, ptr, MEMMODEL_RELEASE);
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}
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static inline void gomp_ptrlock_destroy (gomp_ptrlock_t *ptrlock)
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{
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}
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#endif /* GOMP_PTRLOCK_H */
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