1 #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_POOL_HPP_INCLUDED
2 #define BOOST_SMART_PTR_DETAIL_SPINLOCK_POOL_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 //  boost/detail/spinlock_pool.hpp
12 //
13 //  Copyright (c) 2008 Peter Dimov
14 //
15 //  Distributed under the Boost Software License, Version 1.0.
16 //  See accompanying file LICENSE_1_0.txt or copy at
17 //  http://www.boost.org/LICENSE_1_0.txt)
18 //
19 //  spinlock_pool<0> is reserved for atomic<>, when/if it arrives
20 //  spinlock_pool<1> is reserved for shared_ptr reference counts
21 //  spinlock_pool<2> is reserved for shared_ptr atomic access
22 //
23 
24 #include <boost/config.hpp>
25 #include <boost/smart_ptr/detail/spinlock.hpp>
26 #include <cstddef>
27 
28 namespace boost
29 {
30 
31 namespace detail
32 {
33 
34 template< int M > class spinlock_pool
35 {
36 private:
37 
38     static spinlock pool_[ 41 ];
39 
40 public:
41 
spinlock_for(void const * pv)42     static spinlock & spinlock_for( void const * pv )
43     {
44 #if defined(__VMS) && __INITIAL_POINTER_SIZE == 64
45         std::size_t i = reinterpret_cast< unsigned long long >( pv ) % 41;
46 #else
47         std::size_t i = reinterpret_cast< std::size_t >( pv ) % 41;
48 #endif
49         return pool_[ i ];
50     }
51 
52     class scoped_lock
53     {
54     private:
55 
56         spinlock & sp_;
57 
58         scoped_lock( scoped_lock const & );
59         scoped_lock & operator=( scoped_lock const & );
60 
61     public:
62 
scoped_lock(void const * pv)63         explicit scoped_lock( void const * pv ): sp_( spinlock_for( pv ) )
64         {
65             sp_.lock();
66         }
67 
~scoped_lock()68         ~scoped_lock()
69         {
70             sp_.unlock();
71         }
72     };
73 };
74 
75 template< int M > spinlock spinlock_pool< M >::pool_[ 41 ] =
76 {
77     BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT,
78     BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT,
79     BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT,
80     BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT,
81     BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT,
82     BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT,
83     BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT,
84     BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT,
85     BOOST_DETAIL_SPINLOCK_INIT
86 };
87 
88 } // namespace detail
89 } // namespace boost
90 
91 #endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_POOL_HPP_INCLUDED
92