[4] | 1 | // Copyright (c) 2013 by István Váradi
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| 2 |
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| 3 | // This file is part of VSCPL, a simple cross-platform utility library
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| 4 |
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| 5 | // Redistribution and use in source and binary forms, with or without
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| 6 | // modification, are permitted provided that the following conditions are met:
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| 7 |
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| 8 | // 1. Redistributions of source code must retain the above copyright notice, this
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| 9 | // list of conditions and the following disclaimer.
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| 10 | // 2. Redistributions in binary form must reproduce the above copyright notice,
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| 11 | // this list of conditions and the following disclaimer in the documentation
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| 12 | // and/or other materials provided with the distribution.
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| 13 |
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| 14 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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| 15 | // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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| 16 | // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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| 17 | // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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| 18 | // ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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| 19 | // (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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| 20 | // LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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| 21 | // ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 22 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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| 23 | // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 24 |
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| 25 | // The views and conclusions contained in the software and documentation are those
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| 26 | // of the authors and should not be interpreted as representing official policies,
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| 27 | // either expressed or implied, of the FreeBSD Project.
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| 28 |
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| 29 | #ifndef HU_VARADIISTVAN_SCPL_MUTEX_H
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| 30 | #define HU_VARADIISTVAN_SCPL_MUTEX_H
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| 31 | //------------------------------------------------------------------------------
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| 32 |
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| 33 | #include <pthread.h>
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| 34 |
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| 35 | //------------------------------------------------------------------------------
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| 36 |
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| 37 | namespace hu { namespace varadiistvan { namespace scpl {
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| 38 |
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| 39 | //------------------------------------------------------------------------------
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| 40 |
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| 41 | /**
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| 42 | * Mutual exclusion device for POSIX threads.
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| 43 | */
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| 44 | class Mutex
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| 45 | {
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| 46 | private:
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| 47 | /**
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| 48 | * The mutex structure.
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| 49 | */
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| 50 | pthread_mutex_t mutex;
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| 51 |
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| 52 | public:
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| 53 | /**
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| 54 | * Construct the mutex.
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| 55 | */
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| 56 | Mutex();
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| 57 |
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| 58 | /**
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| 59 | * Destroy the mutex.
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| 60 | */
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| 61 | ~Mutex();
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| 62 |
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| 63 | /**
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| 64 | * Lock the mutex. If the mutex is locked by another thread, the
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| 65 | * caller one waits until the other thread releases the mutex.
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| 66 | */
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| 67 | void lock();
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| 68 |
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| 69 | /**
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| 70 | * Try to lock the mutex. If the mutex is locked by another
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| 71 | * thread, this function returns false immediately. Otherwise it
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| 72 | * locks the mutex and returns true.
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| 73 | */
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| 74 | bool tryLock();
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| 75 |
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| 76 | /**
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| 77 | * Unlock the mutex.
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| 78 | */
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| 79 | void unlock();
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| 80 |
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| 81 | friend class CondVar;
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| 82 | };
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| 83 |
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| 84 | //------------------------------------------------------------------------------
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| 85 | // Inline definitions
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| 86 | //------------------------------------------------------------------------------
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| 87 |
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| 88 | inline Mutex::Mutex()
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| 89 | {
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| 90 | pthread_mutex_init(&mutex, 0);
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| 91 | }
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| 92 |
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| 93 | //------------------------------------------------------------------------------
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| 94 |
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| 95 | inline Mutex::~Mutex()
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| 96 | {
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| 97 | pthread_mutex_destroy(&mutex);
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| 98 | }
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| 99 |
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| 100 | //------------------------------------------------------------------------------
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| 101 |
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| 102 | inline void Mutex::lock()
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| 103 | {
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| 104 | pthread_mutex_lock(&mutex);
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| 105 | }
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| 106 |
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| 107 | //------------------------------------------------------------------------------
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| 108 |
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| 109 | inline bool Mutex::tryLock()
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| 110 | {
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| 111 | return pthread_mutex_trylock(&mutex)==0;
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| 112 | }
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| 113 |
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| 114 | //------------------------------------------------------------------------------
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| 115 |
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| 116 | inline void Mutex::unlock()
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| 117 | {
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| 118 | pthread_mutex_unlock(&mutex);
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| 119 | }
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| 120 |
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| 121 | //------------------------------------------------------------------------------
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| 122 |
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| 123 | } /* namespace hu::varadiistvan::scpl */ } /* namespace hu::varadiistvan */ } /* namespace hu */
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| 124 |
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| 125 | //------------------------------------------------------------------------------
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| 126 | #endif // HU_VARADIISTVAN_SCPL_MUTEX_H
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| 127 |
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| 128 | // Local Variables:
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| 129 | // mode: C++
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| 130 | // c-basic-offset: 4
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| 131 | // indent-tabs-mode: nil
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| 132 | // End:
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