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115 lines
2.6 KiB
C++
115 lines
2.6 KiB
C++
/* Copyright (C) 2003 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#ifndef NDB_MUTEX_H
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#define NDB_MUTEX_H
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#include <ndb_global.h>
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#ifdef NDB_WIN32
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#include <winsock2.h>
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#include <ws2tcpip.h>
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if defined NDB_OSE || defined NDB_SOFTOSE
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#include <ose.h>
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typedef SEMAPHORE NdbMutex;
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#define NDB_MUTEX_INITIALIZER { 1, 0, 0 }
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#elif defined NDB_WIN32
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typedef CRITICAL_SECTION NdbMutex;
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#else
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#include <pthread.h>
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typedef pthread_mutex_t NdbMutex;
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#define NDB_MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER
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#endif
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/**
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* Create a mutex
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*
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* p_mutex: pointer to the mutex structure
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* returnvalue: pointer to the mutex structure
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*/
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NdbMutex* NdbMutex_Create(void);
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/**
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* Destroy a mutex
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*
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* * p_mutex: pointer to the mutex structure
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* * returnvalue: 0 = succeeded, -1 = failed
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*/
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int NdbMutex_Destroy(NdbMutex* p_mutex);
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/**
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* Lock a mutex
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*
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* * p_mutex: pointer to the mutex structure
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* * returnvalue: 0 = succeeded, -1 = failed
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*/
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int NdbMutex_Lock(NdbMutex* p_mutex);
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/**
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* Unlock a mutex
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*
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* * p_mutex: pointer to the mutex structure
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* * returnvalue: 0 = succeeded, -1 = failed
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*/
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int NdbMutex_Unlock(NdbMutex* p_mutex);
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/**
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* Try to lock a mutex
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*
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* * p_mutex: pointer to the mutex structure
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* * returnvalue: 0 = succeeded, -1 = failed
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*/
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int NdbMutex_Trylock(NdbMutex* p_mutex);
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#ifdef __cplusplus
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}
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#endif
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#ifdef __cplusplus
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class NdbLockable {
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friend class Guard;
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public:
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NdbLockable() { m_mutex = NdbMutex_Create(); }
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~NdbLockable() { NdbMutex_Destroy(m_mutex); }
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void lock() { NdbMutex_Lock(m_mutex); }
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void unlock(){ NdbMutex_Unlock(m_mutex);}
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bool tryLock(){ return NdbMutex_Trylock(m_mutex) == 0;}
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NdbMutex* getMutex() {return m_mutex;};
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protected:
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NdbMutex * m_mutex;
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};
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class Guard {
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public:
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Guard(NdbMutex *mtx) : m_mtx(mtx) { NdbMutex_Lock(m_mtx); };
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Guard(NdbLockable & l) : m_mtx(l.m_mutex) { NdbMutex_Lock(m_mtx); };
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~Guard() { NdbMutex_Unlock(m_mtx); };
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private:
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NdbMutex *m_mtx;
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};
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#endif
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#endif
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