1 /* Copyright 2006-2013 Joaquin M Lopez Munoz.
2  * Distributed under the Boost Software License, Version 1.0.
3  * (See accompanying file LICENSE_1_0.txt or copy at
4  * http://www.boost.org/LICENSE_1_0.txt)
5  *
6  * See http://www.boost.org/libs/flyweight for library home page.
7  */
8 
9 #ifndef BOOST_FLYWEIGHT_DETAIL_RECURSIVE_LW_MUTEX_HPP
10 #define BOOST_FLYWEIGHT_DETAIL_RECURSIVE_LW_MUTEX_HPP
11 
12 #if defined(_MSC_VER)
13 #pragma once
14 #endif
15 
16 /* Recursive lightweight mutex. Relies entirely on
17  * boost::detail::lightweight_mutex, except in Pthreads, where we
18  * explicitly use the PTHREAD_MUTEX_RECURSIVE attribute
19  * (lightweight_mutex uses the default mutex type instead).
20  */
21 
22 #include <boost/config.hpp>
23 
24 #if !defined(BOOST_HAS_PTHREADS)
25 #include <boost/detail/lightweight_mutex.hpp>
26 namespace boost{
27 
28 namespace flyweights{
29 
30 namespace detail{
31 
32 typedef boost::detail::lightweight_mutex recursive_lightweight_mutex;
33 
34 } /* namespace flyweights::detail */
35 
36 } /* namespace flyweights */
37 
38 } /* namespace boost */
39 #else
40 /* code shamelessly ripped from <boost/detail/lwm_pthreads.hpp> */
41 
42 #include <boost/assert.hpp>
43 #include <boost/noncopyable.hpp>
44 #include <pthread.h>
45 
46 namespace boost{
47 
48 namespace flyweights{
49 
50 namespace detail{
51 
52 struct recursive_lightweight_mutex:noncopyable
53 {
recursive_lightweight_mutexboost::flyweights::detail::recursive_lightweight_mutex54   recursive_lightweight_mutex()
55   {
56     pthread_mutexattr_t attr;
57     BOOST_VERIFY(pthread_mutexattr_init(&attr)==0);
58     BOOST_VERIFY(pthread_mutexattr_settype(&attr,PTHREAD_MUTEX_RECURSIVE)==0);
59     BOOST_VERIFY(pthread_mutex_init(&m_,&attr)==0);
60     BOOST_VERIFY(pthread_mutexattr_destroy(&attr)==0);
61   }
62 
~recursive_lightweight_mutexboost::flyweights::detail::recursive_lightweight_mutex63   ~recursive_lightweight_mutex(){pthread_mutex_destroy(&m_);}
64 
65   struct scoped_lock;
66   friend struct scoped_lock;
67   struct scoped_lock:noncopyable
68   {
69   public:
scoped_lockboost::flyweights::detail::recursive_lightweight_mutex::scoped_lock70     scoped_lock(recursive_lightweight_mutex& m):m_(m.m_)
71     {
72       BOOST_VERIFY(pthread_mutex_lock(&m_)==0);
73     }
74 
~scoped_lockboost::flyweights::detail::recursive_lightweight_mutex::scoped_lock75     ~scoped_lock(){BOOST_VERIFY(pthread_mutex_unlock(&m_)==0);}
76 
77   private:
78     pthread_mutex_t& m_;
79   };
80 
81 private:
82   pthread_mutex_t m_;
83 };
84 
85 } /* namespace flyweights::detail */
86 
87 } /* namespace flyweights */
88 
89 } /* namespace boost */
90 #endif
91 
92 #endif
93