|
910.5.2
by Monty Taylor
Applied atomic patch to current tree. |
1 |
/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
|
2 |
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
|
|
3 |
*
|
|
4 |
* Copyright (C) 2009 Sun Microsystems
|
|
5 |
*
|
|
6 |
* This program is free software; you can redistribute it and/or modify
|
|
7 |
* it under the terms of the GNU General Public License as published by
|
|
8 |
* the Free Software Foundation; version 2 of the License.
|
|
9 |
*
|
|
10 |
* This program is distributed in the hope that it will be useful,
|
|
11 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
12 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
13 |
* GNU General Public License for more details.
|
|
14 |
*
|
|
15 |
* You should have received a copy of the GNU General Public License
|
|
16 |
* along with this program; if not, write to the Free Software
|
|
17 |
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
18 |
*/
|
|
19 |
||
20 |
#ifndef DRIZZLED_ATOMIC_GCC_TRAITS_H
|
|
21 |
#define DRIZZLED_ATOMIC_GCC_TRAITS_H
|
|
22 |
||
|
968.2.3
by Monty Taylor
Replacd use of tbb:: namespace with drizzled:: |
23 |
namespace drizzled { |
|
910.5.2
by Monty Taylor
Applied atomic patch to current tree. |
24 |
namespace internal { |
25 |
||
26 |
template<typename T, typename D> |
|
27 |
class gcc_traits |
|
28 |
{
|
|
29 |
||
30 |
public: |
|
31 |
typedef T value_type; |
|
32 |
||
33 |
gcc_traits() {} |
|
34 |
||
35 |
/* YES. I know these are semantically backwards...
|
|
36 |
* so... TODO: Ensure we're doing the "right" thing here
|
|
37 |
*/
|
|
38 |
inline value_type fetch_and_add(volatile value_type *value, D addend ) |
|
39 |
{
|
|
40 |
return __sync_add_and_fetch(value, addend); |
|
41 |
}
|
|
42 |
||
43 |
inline value_type fetch_and_increment(volatile value_type *value) |
|
44 |
{
|
|
45 |
return __sync_add_and_fetch(value, 1); |
|
46 |
}
|
|
47 |
||
48 |
inline value_type fetch_and_decrement(volatile value_type *value) |
|
49 |
{
|
|
50 |
return __sync_sub_and_fetch(value, 1); |
|
51 |
}
|
|
52 |
||
53 |
inline value_type fetch_and_store(volatile value_type *value, |
|
54 |
value_type new_value) |
|
55 |
{
|
|
56 |
/* TODO: Is this the right one? */
|
|
57 |
return __sync_lock_test_and_set(value, new_value); |
|
58 |
}
|
|
59 |
||
60 |
inline value_type compare_and_swap(volatile value_type *value, |
|
61 |
value_type new_value, |
|
62 |
value_type comparand ) |
|
63 |
{
|
|
64 |
return __sync_val_compare_and_swap(value, comparand, new_value); |
|
65 |
}
|
|
66 |
||
67 |
inline value_type fetch(const volatile value_type *value) const volatile |
|
68 |
{
|
|
|
1093.1.17
by Jay Pipes
Per IRC conversation with krow and mtaylor, reverted change in simple atomic fetch for GCC to previous call. Does not compile on ICC and added a note stating this. |
69 |
/*
|
70 |
* This is necessary to ensure memory barriers are respected when
|
|
71 |
* simply returning the value pointed at. However, this does not
|
|
72 |
* compile on ICC.
|
|
73 |
*
|
|
74 |
* @todo
|
|
75 |
*
|
|
76 |
* Look at how to rewrite the below to something that ICC feels is
|
|
77 |
* OK and yet respects memory barriers.
|
|
78 |
*/
|
|
79 |
return __sync_add_and_fetch(const_cast<value_type *>(value), 0); |
|
|
910.5.2
by Monty Taylor
Applied atomic patch to current tree. |
80 |
}
|
81 |
||
82 |
inline value_type store_with_release(volatile value_type *value, |
|
83 |
value_type new_value) |
|
84 |
{
|
|
85 |
*value= new_value; |
|
86 |
return *value; |
|
87 |
}
|
|
88 |
||
89 |
}; /* gcc_traits */ |
|
90 |
||
91 |
||
92 |
} /* namespace internal */ |
|
|
968.2.3
by Monty Taylor
Replacd use of tbb:: namespace with drizzled:: |
93 |
} /* namespace drizzled */ |
|
910.5.2
by Monty Taylor
Applied atomic patch to current tree. |
94 |
|
95 |
#endif /* DRIZZLED_ATOMIC_GCC_TRAITS_H */ |