/usr/include/mircommon/mir/posix_rw_mutex.h is in libmircommon-dev 0.26.3+16.04.20170605-0ubuntu1.1.
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 | /*
* Copyright © 2016 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3,
* as published by the Free Software Foundation.
*
* This program 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.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authored by: Christopher James Halse Rogers <christopher.halse.rogers@canonical.com>
*/
#ifndef MIR_POSIX_RW_MUTEX_H_
#define MIR_POSIX_RW_MUTEX_H_
#include <pthread.h>
namespace mir
{
/**
* Implementation of the Mutex and SharedMutex C++14 concepts via POSIX pthread rwlock
*
* The advantages of using this over std::shared_timed_mutex are:
* a) The type of rwlock can be selected (as per pthread_rwlock_attr_setkind_np)
* b) As per POSIX, read locks are recursive rather than undefined behaviour
*/
class PosixRWMutex
{
public:
enum class Type
{
Default,
PreferReader,
PreferWriterNonRecursive
};
PosixRWMutex();
PosixRWMutex(Type type);
~PosixRWMutex();
PosixRWMutex(PosixRWMutex const&) = delete;
PosixRWMutex& operator=(PosixRWMutex const&) = delete;
/*
* SharedMutex concept implementation
*/
void lock_shared();
bool try_lock_shared();
void unlock_shared();
/*
* Mutex concept implementation
*/
void lock();
bool try_lock();
void unlock();
private:
pthread_rwlock_t mutex;
};
}
#endif //MIR_POSIX_RW_MUTEX_H_
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