1 //////////////////////////////////////////////////////////////////////////////
2 //
3 // (C) Copyright Ion Gaztanaga 2005-2012. Distributed under the Boost
4 // Software License, Version 1.0. (See accompanying file
5 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6 //
7 // See http://www.boost.org/libs/interprocess for documentation.
8 //
9 //////////////////////////////////////////////////////////////////////////////
10 
11 #ifndef BOOST_INTERPROCESS_LOCK_OPTIONS_HPP
12 #define BOOST_INTERPROCESS_LOCK_OPTIONS_HPP
13 
14 #ifndef BOOST_CONFIG_HPP
15 #  include <boost/config.hpp>
16 #endif
17 #
18 #if defined(BOOST_HAS_PRAGMA_ONCE)
19 #  pragma once
20 #endif
21 
22 #include <boost/interprocess/detail/config_begin.hpp>
23 #include <boost/interprocess/detail/workaround.hpp>
24 
25 //!\file
26 //!Describes the lock options with associated with interprocess_mutex lock constructors.
27 
28 namespace boost {
29 
30 #if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
31 
32 namespace posix_time
33 {  class ptime;   }
34 
35 #endif   //#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
36 
37 namespace interprocess {
38 
39 //!Type to indicate to a mutex lock constructor that must not lock the mutex.
40 struct defer_lock_type{};
41 //!Type to indicate to a mutex lock constructor that must try to lock the mutex.
42 struct try_to_lock_type {};
43 //!Type to indicate to a mutex lock constructor that the mutex is already locked.
44 struct accept_ownership_type{};
45 
46 //!An object indicating that the locking
47 //!must be deferred.
48 static const defer_lock_type      defer_lock      = defer_lock_type();
49 
50 //!An object indicating that a try_lock()
51 //!operation must be executed.
52 static const try_to_lock_type     try_to_lock    = try_to_lock_type();
53 
54 //!An object indicating that the ownership of lockable
55 //!object must be accepted by the new owner.
56 static const accept_ownership_type  accept_ownership = accept_ownership_type();
57 
58 } // namespace interprocess {
59 } // namespace boost{
60 
61 #include <boost/interprocess/detail/config_end.hpp>
62 
63 #endif // BOOST_INTERPROCESS_LOCK_OPTIONS_HPP
64