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818ab71a | 1 | /* Copyright (C) 2009-2016 Free Software Foundation, Inc. |
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2 | Contributed by Richard Henderson <rth@redhat.com>. |
3 | ||
4 | This file is part of the GNU Transactional Memory Library (libitm). | |
5 | ||
6 | Libitm is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | Libitm is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
13 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
14 | more details. | |
15 | ||
16 | Under Section 7 of GPL version 3, you are granted additional | |
17 | permissions described in the GCC Runtime Library Exception, version | |
18 | 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | You should have received a copy of the GNU General Public License and | |
21 | a copy of the GCC Runtime Library Exception along with this program; | |
22 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | <http://www.gnu.org/licenses/>. */ | |
24 | ||
25 | #ifndef LIBITM_CACHELINE_H | |
26 | #define LIBITM_CACHELINE_H 1 | |
27 | ||
28 | namespace GTM HIDDEN { | |
29 | ||
30 | // A cacheline is the smallest unit with which locks are associated. | |
31 | // The current implementation of the _ITM_[RW] barriers assumes that | |
32 | // all data types can fit (aligned) within a cachline, which means | |
33 | // in practice sizeof(complex long double) is the smallest cacheline size. | |
34 | // It ought to be small enough for efficient manipulation of the | |
35 | // modification mask, below. | |
36 | #ifndef CACHELINE_SIZE | |
37 | # define CACHELINE_SIZE 32 | |
38 | #endif | |
39 | ||
40 | // A gtm_cacheline_mask stores a modified bit for every modified byte | |
41 | // in the cacheline with which it is associated. | |
42 | typedef sized_integral<CACHELINE_SIZE / 8>::type gtm_cacheline_mask; | |
43 | ||
44 | union gtm_cacheline | |
45 | { | |
46 | // Byte access to the cacheline. | |
47 | unsigned char b[CACHELINE_SIZE] __attribute__((aligned(CACHELINE_SIZE))); | |
48 | ||
49 | // Larger sized access to the cacheline. | |
50 | uint16_t u16[CACHELINE_SIZE / sizeof(uint16_t)]; | |
51 | uint32_t u32[CACHELINE_SIZE / sizeof(uint32_t)]; | |
52 | uint64_t u64[CACHELINE_SIZE / sizeof(uint64_t)]; | |
53 | gtm_word w[CACHELINE_SIZE / sizeof(gtm_word)]; | |
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54 | }; |
55 | ||
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56 | } // namespace GTM |
57 | ||
58 | #endif // LIBITM_CACHELINE_H |