1 #ifndef BOOST_DETAIL_ATOMIC_COUNT_LINUX_HPP_INCLUDED
2 #define BOOST_DETAIL_ATOMIC_COUNT_LINUX_HPP_INCLUDED
5 // boost/detail/atomic_count_linux.hpp
7 // Copyright (c) 2001, 2002 Peter Dimov and Multi Media Ltd.
9 // Permission to copy, use, modify, sell and distribute this software
10 // is granted provided this copyright notice appears in all copies.
11 // This software is provided "as is" without express or implied
12 // warranty, and with no claim as to its suitability for any purpose.
16 // This implementation uses <asm/atomic.h>. This is a kernel header;
17 // using kernel headers in a user program may cause a number of problems,
18 // and not all flavors of Linux provide the atomic instructions.
20 // This file is only provided because the performance of this implementation
21 // is significantly higher than the pthreads version. Use at your own risk
22 // (by defining BOOST_USE_ASM_ATOMIC_H.)
25 #include <asm/atomic.h>
37 explicit atomic_count(long v)
39 atomic_t init = ATOMIC_INIT(v);
50 return !atomic_dec_and_test(&value_);
55 return atomic_read(&value_);
60 atomic_count(atomic_count const &);
61 atomic_count & operator=(atomic_count const &);
70 #endif // #ifndef BOOST_DETAIL_ATOMIC_COUNT_LINUX_HPP_INCLUDED