/usr/include/licq/thread/mutex.h is in licq-dev 1.8.1-2build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 | /*
* This file is part of Licq, an instant messaging client for UNIX.
* Copyright (C) 2010 Licq developers
*
* Licq is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Licq 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Licq; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef LICQ_MUTEX_H
#define LICQ_MUTEX_H
#include <boost/noncopyable.hpp>
#include <pthread.h>
namespace Licq
{
/**
* @defgroup thread Thread
* Helper classes for synchronizing threads and protecting shared data.
*/
/**
* A mutual exclusion device.
*
* It is useful for protecting shared data structures from concurrent
* modifications, and implementing critical sections and monitors.
*
* @ingroup thread
*/
class Mutex : private boost::noncopyable
{
public:
/**
* Creates a new mutex.
* @post The mutex is unlocked.
*/
Mutex();
/**
* Destroys the mutex.
* @pre The mutex is unlocked.
*/
~Mutex();
/**
* Locks the mutex. Blocks until the lock is acquired.
* @pre The mutex is @b not locked by the calling thread.
*/
void lock();
/**
* Tries to lock the mutex without blocking.
* @returns True if the lock was acquired; otherwise false.
*/
bool tryLock();
/**
* Unlocks the mutex.
* @pre The mutex is locked the calling thread.
*/
void unlock();
private:
pthread_mutex_t myMutex;
// Condition needs to access myMutex
friend class Condition;
};
inline Mutex::Mutex()
{
::pthread_mutex_init(&myMutex, NULL);
}
inline Mutex::~Mutex()
{
:: pthread_mutex_destroy(&myMutex);
}
inline void Mutex::lock()
{
::pthread_mutex_lock(&myMutex);
}
inline bool Mutex::tryLock()
{
return ::pthread_mutex_trylock(&myMutex) == 0;
}
inline void Mutex::unlock()
{
::pthread_mutex_unlock(&myMutex);
}
} // namespace Licq
#endif
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