Merge c:/dyninst/pc_bluegene/dyninst into dyn_pc_integration
[dyninst.git] / external / boost / detail / spinlock_nt.hpp
1 #ifndef BOOST_DETAIL_SPINLOCK_NT_HPP_INCLUDED
2 #define BOOST_DETAIL_SPINLOCK_NT_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/assert.hpp>
19
20 namespace boost
21 {
22
23 namespace detail
24 {
25
26 class spinlock
27 {
28 public:
29
30     bool locked_;
31
32 public:
33
34     inline bool try_lock()
35     {
36         if( locked_ )
37         {
38             return false;
39         }
40         else
41         {
42             locked_ = true;
43             return true;
44         }
45     }
46
47     inline void lock()
48     {
49         BOOST_ASSERT( !locked_ );
50         locked_ = true;
51     }
52
53     inline void unlock()
54     {
55         BOOST_ASSERT( locked_ );
56         locked_ = false;
57     }
58
59 public:
60
61     class scoped_lock
62     {
63     private:
64
65         spinlock & sp_;
66
67         scoped_lock( scoped_lock const & );
68         scoped_lock & operator=( scoped_lock const & );
69
70     public:
71
72         explicit scoped_lock( spinlock & sp ): sp_( sp )
73         {
74             sp.lock();
75         }
76
77         ~scoped_lock()
78         {
79             sp_.unlock();
80         }
81     };
82 };
83
84 } // namespace detail
85 } // namespace boost
86
87 #define BOOST_DETAIL_SPINLOCK_INIT { false }
88
89 #endif // #ifndef BOOST_DETAIL_SPINLOCK_NT_HPP_INCLUDED