source:
vendors/XIOS/current/extern/boost/include/boost/smart_ptr/detail/spinlock_w32.hpp
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3428
Last change on this file since 3428 was 3428, checked in by rblod, 12 years ago | |
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1 | #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_W32_HPP_INCLUDED |
2 | #define BOOST_SMART_PTR_DETAIL_SPINLOCK_W32_HPP_INCLUDED |
3 | |
4 | // MS compatible compilers support #pragma once |
5 | |
6 | #if defined(_MSC_VER) && (_MSC_VER >= 1020) |
7 | # pragma once |
8 | #endif |
9 | |
10 | // |
11 | // Copyright (c) 2008 Peter Dimov |
12 | // |
13 | // Distributed under the Boost Software License, Version 1.0. |
14 | // See accompanying file LICENSE_1_0.txt or copy at |
15 | // http://www.boost.org/LICENSE_1_0.txt) |
16 | // |
17 | |
18 | #include <boost/detail/interlocked.hpp> |
19 | #include <boost/smart_ptr/detail/yield_k.hpp> |
20 | |
21 | // BOOST_COMPILER_FENCE |
22 | |
23 | #if defined(__INTEL_COMPILER) |
24 | |
25 | #define BOOST_COMPILER_FENCE __memory_barrier(); |
26 | |
27 | #elif defined( _MSC_VER ) && _MSC_VER >= 1310 |
28 | |
29 | extern "C" void _ReadWriteBarrier(); |
30 | #pragma intrinsic( _ReadWriteBarrier ) |
31 | |
32 | #define BOOST_COMPILER_FENCE _ReadWriteBarrier(); |
33 | |
34 | #elif defined(__GNUC__) |
35 | |
36 | #define BOOST_COMPILER_FENCE __asm__ __volatile__( "" : : : "memory" ); |
37 | |
38 | #else |
39 | |
40 | #define BOOST_COMPILER_FENCE |
41 | |
42 | #endif |
43 | |
44 | // |
45 | |
46 | namespace boost |
47 | { |
48 | |
49 | namespace detail |
50 | { |
51 | |
52 | class spinlock |
53 | { |
54 | public: |
55 | |
56 | long v_; |
57 | |
58 | public: |
59 | |
60 | bool try_lock() |
61 | { |
62 | long r = BOOST_INTERLOCKED_EXCHANGE( &v_, 1 ); |
63 | |
64 | BOOST_COMPILER_FENCE |
65 | |
66 | return r == 0; |
67 | } |
68 | |
69 | void lock() |
70 | { |
71 | for( unsigned k = 0; !try_lock(); ++k ) |
72 | { |
73 | boost::detail::yield( k ); |
74 | } |
75 | } |
76 | |
77 | void unlock() |
78 | { |
79 | BOOST_COMPILER_FENCE |
80 | *const_cast< long volatile* >( &v_ ) = 0; |
81 | } |
82 | |
83 | public: |
84 | |
85 | class scoped_lock |
86 | { |
87 | private: |
88 | |
89 | spinlock & sp_; |
90 | |
91 | scoped_lock( scoped_lock const & ); |
92 | scoped_lock & operator=( scoped_lock const & ); |
93 | |
94 | public: |
95 | |
96 | explicit scoped_lock( spinlock & sp ): sp_( sp ) |
97 | { |
98 | sp.lock(); |
99 | } |
100 | |
101 | ~scoped_lock() |
102 | { |
103 | sp_.unlock(); |
104 | } |
105 | }; |
106 | }; |
107 | |
108 | } // namespace detail |
109 | } // namespace boost |
110 | |
111 | #define BOOST_DETAIL_SPINLOCK_INIT {0} |
112 | |
113 | #endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_W32_HPP_INCLUDED |
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