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7c673cae FG |
1 | #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_NT_HPP_INCLUDED |
2 | #define BOOST_SMART_PTR_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 | ||
20effc67 TL |
20 | #if defined(BOOST_SP_REPORT_IMPLEMENTATION) |
21 | ||
22 | #include <boost/config/pragma_message.hpp> | |
23 | BOOST_PRAGMA_MESSAGE("Using single-threaded spinlock emulation") | |
24 | ||
25 | #endif | |
26 | ||
7c673cae FG |
27 | namespace boost |
28 | { | |
29 | ||
30 | namespace detail | |
31 | { | |
32 | ||
33 | class spinlock | |
34 | { | |
35 | public: | |
36 | ||
37 | bool locked_; | |
38 | ||
39 | public: | |
40 | ||
41 | inline bool try_lock() | |
42 | { | |
43 | if( locked_ ) | |
44 | { | |
45 | return false; | |
46 | } | |
47 | else | |
48 | { | |
49 | locked_ = true; | |
50 | return true; | |
51 | } | |
52 | } | |
53 | ||
54 | inline void lock() | |
55 | { | |
56 | BOOST_ASSERT( !locked_ ); | |
57 | locked_ = true; | |
58 | } | |
59 | ||
60 | inline void unlock() | |
61 | { | |
62 | BOOST_ASSERT( locked_ ); | |
63 | locked_ = false; | |
64 | } | |
65 | ||
66 | public: | |
67 | ||
68 | class scoped_lock | |
69 | { | |
70 | private: | |
71 | ||
72 | spinlock & sp_; | |
73 | ||
74 | scoped_lock( scoped_lock const & ); | |
75 | scoped_lock & operator=( scoped_lock const & ); | |
76 | ||
77 | public: | |
78 | ||
79 | explicit scoped_lock( spinlock & sp ): sp_( sp ) | |
80 | { | |
81 | sp.lock(); | |
82 | } | |
83 | ||
84 | ~scoped_lock() | |
85 | { | |
86 | sp_.unlock(); | |
87 | } | |
88 | }; | |
89 | }; | |
90 | ||
91 | } // namespace detail | |
92 | } // namespace boost | |
93 | ||
94 | #define BOOST_DETAIL_SPINLOCK_INIT { false } | |
95 | ||
96 | #endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_NT_HPP_INCLUDED |