mutex.hpp 4.25 KB
Newer Older
Martin Sustrik's avatar
Martin Sustrik committed
1
/*
2
    Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
Martin Sustrik's avatar
Martin Sustrik committed
3

4
    This file is part of libzmq, the ZeroMQ core engine in C++.
Martin Sustrik's avatar
Martin Sustrik committed
5

6 7 8
    libzmq is free software; you can redistribute it and/or modify it under
    the terms of the GNU Lesser General Public License (LGPL) as published
    by the Free Software Foundation; either version 3 of the License, or
Martin Sustrik's avatar
Martin Sustrik committed
9 10
    (at your option) any later version.

11 12 13 14 15 16 17 18 19 20 21 22 23 24
    As a special exception, the Contributors give you permission to link
    this library with independent modules to produce an executable,
    regardless of the license terms of these independent modules, and to
    copy and distribute the resulting executable under terms of your choice,
    provided that you also meet, for each linked independent module, the
    terms and conditions of the license of that module. An independent
    module is a module which is not derived from or based on this library.
    If you modify this library, you must extend this exception to your
    version of the library.

    libzmq is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
    License for more details.
Martin Sustrik's avatar
Martin Sustrik committed
25

26
    You should have received a copy of the GNU Lesser General Public License
Martin Sustrik's avatar
Martin Sustrik committed
27 28 29
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

Martin Sustrik's avatar
Martin Sustrik committed
30 31
#ifndef __ZMQ_MUTEX_HPP_INCLUDED__
#define __ZMQ_MUTEX_HPP_INCLUDED__
Martin Sustrik's avatar
Martin Sustrik committed
32 33 34 35 36 37

#include "platform.hpp"
#include "err.hpp"

//  Mutex class encapsulates OS mutex in a platform-independent way.

Martin Sustrik's avatar
Martin Sustrik committed
38
#ifdef ZMQ_HAVE_WINDOWS
Martin Sustrik's avatar
Martin Sustrik committed
39 40 41

#include "windows.hpp"

Martin Sustrik's avatar
Martin Sustrik committed
42
namespace zmq
Martin Sustrik's avatar
Martin Sustrik committed
43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62
{

    class mutex_t
    {
    public:
        inline mutex_t ()
        {
            InitializeCriticalSection (&cs);
        }

        inline ~mutex_t ()
        {
            DeleteCriticalSection (&cs);
        }

        inline void lock ()
        {
            EnterCriticalSection (&cs);
        }

danielkr's avatar
danielkr committed
63 64
        inline bool try_lock ()
        {
65
            return (TryEnterCriticalSection (&cs)) ? true : false;
danielkr's avatar
danielkr committed
66 67
        }

Martin Sustrik's avatar
Martin Sustrik committed
68 69 70 71 72
        inline void unlock ()
        {
            LeaveCriticalSection (&cs);
        }

somdoron's avatar
somdoron committed
73 74 75 76 77
        inline CRITICAL_SECTION* get_cs()
        {
            return &cs;
        }

Martin Sustrik's avatar
Martin Sustrik committed
78 79 80 81 82 83 84 85 86 87 88 89 90 91 92
    private:

        CRITICAL_SECTION cs;

        //  Disable copy construction and assignment.
        mutex_t (const mutex_t&);
        void operator = (const mutex_t&);
    };

}

#else

#include <pthread.h>

Martin Sustrik's avatar
Martin Sustrik committed
93
namespace zmq
Martin Sustrik's avatar
Martin Sustrik committed
94
{
95

Martin Sustrik's avatar
Martin Sustrik committed
96 97 98 99 100
    class mutex_t
    {
    public:
        inline mutex_t ()
        {
101 102 103 104 105 106 107
            int rc = pthread_mutexattr_init(&attr);
            posix_assert (rc);

            rc = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
            posix_assert (rc);

            rc = pthread_mutex_init (&mutex, &attr);
108
            posix_assert (rc);
Martin Sustrik's avatar
Martin Sustrik committed
109
        }
110

Martin Sustrik's avatar
Martin Sustrik committed
111 112 113
        inline ~mutex_t ()
        {
            int rc = pthread_mutex_destroy (&mutex);
114
            posix_assert (rc);
115 116 117

            rc = pthread_mutexattr_destroy (&attr);
            posix_assert (rc);
Martin Sustrik's avatar
Martin Sustrik committed
118
        }
119

Martin Sustrik's avatar
Martin Sustrik committed
120 121 122
        inline void lock ()
        {
            int rc = pthread_mutex_lock (&mutex);
123
            posix_assert (rc);
Martin Sustrik's avatar
Martin Sustrik committed
124
        }
125

danielkr's avatar
danielkr committed
126 127 128 129 130 131 132 133 134 135
        inline bool try_lock ()
        {
            int rc = pthread_mutex_trylock (&mutex);
            if (rc == EBUSY)
                return false;

            posix_assert (rc);
            return true;
        }

Martin Sustrik's avatar
Martin Sustrik committed
136 137 138
        inline void unlock ()
        {
            int rc = pthread_mutex_unlock (&mutex);
139
            posix_assert (rc);
Martin Sustrik's avatar
Martin Sustrik committed
140
        }
141

somdoron's avatar
somdoron committed
142 143 144 145 146
        inline pthread_mutex_t* get_mutex()
        {
            return &mutex;
        }

Martin Sustrik's avatar
Martin Sustrik committed
147
    private:
148

Martin Sustrik's avatar
Martin Sustrik committed
149
        pthread_mutex_t mutex;
150
        pthread_mutexattr_t attr;
151

152
        // Disable copy construction and assignment.
Martin Sustrik's avatar
Martin Sustrik committed
153
        mutex_t (const mutex_t&);
154
        const mutex_t &operator = (const mutex_t&);
Martin Sustrik's avatar
Martin Sustrik committed
155
    };
156

Martin Sustrik's avatar
Martin Sustrik committed
157 158 159 160
}

#endif

161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186

namespace zmq
{
    struct scoped_lock_t
    {
        scoped_lock_t (mutex_t& mutex_)
            : mutex (mutex_)
        {
            mutex.lock ();
        }

        ~scoped_lock_t ()
        {
            mutex.unlock ();
        }

    private:

        mutex_t& mutex;

        // Disable copy construction and assignment.
        scoped_lock_t (const scoped_lock_t&);
        const scoped_lock_t &operator = (const scoped_lock_t&);
    };
}

Martin Sustrik's avatar
Martin Sustrik committed
187
#endif