MySQL++ Reference Manual

MySQL++: beemutex.h Source File

MySQL++ 3.3.0

beemutex.h
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1
21 /***********************************************************************
22 Copyright © 2004 Beeyond Software Holding BV and © 2007-2008, 2018
23 by Educational Technology Resources, Inc. Others may also hold
24 copyrights on code in this file. See the CREDITS.txt file in the
25 top directory of the distribution for details.
26
27 This file is part of MySQL++.
28
29 MySQL++ is free software; you can redistribute it and/or modify it
30 under the terms of the GNU Lesser General Public License as published
31 by the Free Software Foundation; either version 2.1 of the License, or
32 (at your option) any later version.
33
34 MySQL++ is distributed in the hope that it will be useful, but WITHOUT
35 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
36 FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
37 License for more details.
38
39 You should have received a copy of the GNU Lesser General Public
40 License along with MySQL++; if not, write to the Free Software
41 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
42 USA
43 ***********************************************************************/
44
45 #if !defined(MYSQLPP_BEEMUTEX_H)
46 #define MYSQLPP_BEEMUTEX_H
47
48 #include "exceptions.h"
49
50 namespace mysqlpp {
51
59 class MYSQLPP_EXPORT BeecryptMutex
60 {
61 public:
66 BeecryptMutex() MAY_THROW(MutexFailed);
67
71 ~BeecryptMutex();
72
75 void lock() MAY_THROW(MutexFailed);
76
79 bool trylock() MAY_THROW(MutexFailed);
80
82 void unlock() MAY_THROW(MutexFailed);
83
84 private:
85 void* pmutex_;
86 };
87
88
96
97 class ScopedLock
98 {
99 public:
101 explicit ScopedLock(BeecryptMutex& mutex) :
102 mutex_(mutex)
103 {
104 mutex.lock();
105 }
106
107 #if __cplusplus >= 201103L
108 // Disallow copies and assignments
109 ScopedLock(const ScopedLock&) = delete;
110 const ScopedLock& operator =(const ScopedLock&) = delete;
111 #endif
112
114 ~ScopedLock() { mutex_.unlock(); }
115
116 private:
117 #if __cplusplus < 201103L
118 // Pre-C++11 alternatives to disallow copies and assignments.
119 ScopedLock(const ScopedLock&);
120 ScopedLock& operator =(const ScopedLock&);
121 #endif
122
123 BeecryptMutex& mutex_;
124 };
125
126 } // end namespace mysqlpp
127
128 #endif // !defined(MYSQLPP_BEEMUTEX_H)
129
mysqlpp::BeecryptMutex
Wrapper around platform-specific mutexes.
Definition: beemutex.h:60
mysqlpp::BeecryptMutex::unlock
void unlock() MAY_THROW(MutexFailed)
Release the mutex.
Definition: beemutex.cpp:167
mysqlpp::BeecryptMutex::lock
void lock() MAY_THROW(MutexFailed)
Acquire the mutex, blocking if it can't be acquired immediately.
Definition: beemutex.cpp:110
mysqlpp::MutexFailed
Exception thrown when a BeecryptMutex object fails.
Definition: exceptions.h:390
mysqlpp::ScopedLock
Wrapper around BeecryptMutex to add scope-bound locking and unlocking.
Definition: beemutex.h:98
mysqlpp::ScopedLock::ScopedLock
ScopedLock(BeecryptMutex &mutex)
Lock the mutex.
Definition: beemutex.h:101
mysqlpp::ScopedLock::~ScopedLock
~ScopedLock()
Unlock the mutex.
Definition: beemutex.h:114
exceptions.h
Declares the MySQL++-specific exception classes.