mirror of
https://github.com/autc04/Retro68.git
synced 2024-12-02 18:53:22 +00:00
75 lines
2.3 KiB
C
75 lines
2.3 KiB
C
/* Copyright (C) 2008-2016 Free Software Foundation, Inc.
|
|
Contributed by Jakub Jelinek <jakub@redhat.com>.
|
|
|
|
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 Linux specific implementation of a mutex synchronization
|
|
mechanism for libgomp. This type is private to the library. This
|
|
implementation uses atomic instructions and the futex syscall. */
|
|
|
|
#ifndef GOMP_WAIT_H
|
|
#define GOMP_WAIT_H 1
|
|
|
|
#include "libgomp.h"
|
|
#include <errno.h>
|
|
|
|
#define FUTEX_WAIT 0
|
|
#define FUTEX_WAKE 1
|
|
#define FUTEX_PRIVATE_FLAG 128
|
|
|
|
#ifdef HAVE_ATTRIBUTE_VISIBILITY
|
|
# pragma GCC visibility push(hidden)
|
|
#endif
|
|
|
|
extern int gomp_futex_wait, gomp_futex_wake;
|
|
|
|
#include <futex.h>
|
|
|
|
static inline int do_spin (int *addr, int val)
|
|
{
|
|
unsigned long long i, count = gomp_spin_count_var;
|
|
|
|
if (__builtin_expect (__atomic_load_n (&gomp_managed_threads,
|
|
MEMMODEL_RELAXED)
|
|
> gomp_available_cpus, 0))
|
|
count = gomp_throttled_spin_count_var;
|
|
for (i = 0; i < count; i++)
|
|
if (__builtin_expect (__atomic_load_n (addr, MEMMODEL_RELAXED) != val, 0))
|
|
return 0;
|
|
else
|
|
cpu_relax ();
|
|
return 1;
|
|
}
|
|
|
|
static inline void do_wait (int *addr, int val)
|
|
{
|
|
if (do_spin (addr, val))
|
|
futex_wait (addr, val);
|
|
}
|
|
|
|
#ifdef HAVE_ATTRIBUTE_VISIBILITY
|
|
# pragma GCC visibility pop
|
|
#endif
|
|
|
|
#endif /* GOMP_WAIT_H */
|