59 lines
2.2 KiB
C++
59 lines
2.2 KiB
C++
/* Copyright (C) 2009-2013 Free Software Foundation, Inc.
|
|
Contributed by Richard Henderson <rth@redhat.com>.
|
|
|
|
This file is part of the GNU Transactional Memory Library (libitm).
|
|
|
|
Libitm 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 of the License, or
|
|
(at your option) any later version.
|
|
|
|
Libitm 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/>. */
|
|
|
|
#ifndef LIBITM_CACHELINE_H
|
|
#define LIBITM_CACHELINE_H 1
|
|
|
|
namespace GTM HIDDEN {
|
|
|
|
// A cacheline is the smallest unit with which locks are associated.
|
|
// The current implementation of the _ITM_[RW] barriers assumes that
|
|
// all data types can fit (aligned) within a cachline, which means
|
|
// in practice sizeof(complex long double) is the smallest cacheline size.
|
|
// It ought to be small enough for efficient manipulation of the
|
|
// modification mask, below.
|
|
#ifndef CACHELINE_SIZE
|
|
# define CACHELINE_SIZE 32
|
|
#endif
|
|
|
|
// A gtm_cacheline_mask stores a modified bit for every modified byte
|
|
// in the cacheline with which it is associated.
|
|
typedef sized_integral<CACHELINE_SIZE / 8>::type gtm_cacheline_mask;
|
|
|
|
union gtm_cacheline
|
|
{
|
|
// Byte access to the cacheline.
|
|
unsigned char b[CACHELINE_SIZE] __attribute__((aligned(CACHELINE_SIZE)));
|
|
|
|
// Larger sized access to the cacheline.
|
|
uint16_t u16[CACHELINE_SIZE / sizeof(uint16_t)];
|
|
uint32_t u32[CACHELINE_SIZE / sizeof(uint32_t)];
|
|
uint64_t u64[CACHELINE_SIZE / sizeof(uint64_t)];
|
|
gtm_word w[CACHELINE_SIZE / sizeof(gtm_word)];
|
|
};
|
|
|
|
} // namespace GTM
|
|
|
|
#endif // LIBITM_CACHELINE_H
|