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/* Copyright (C) 2003 MySQL AB
This program 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.
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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#ifndef NDB_MUTEX_H
#define NDB_MUTEX_H
#include <ndb_global.h>
#ifdef NDB_WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif
#if defined NDB_OSE || defined NDB_SOFTOSE
#include <ose.h>
typedef SEMAPHORE NdbMutex;
#elif defined NDB_WIN32
typedef CRITICAL_SECTION NdbMutex;
#else
#include <pthread.h>
typedef pthread_mutex_t NdbMutex;
#endif
/**
* Create a mutex
*
* p_mutex: pointer to the mutex structure
* returnvalue: pointer to the mutex structure
*/
NdbMutex* NdbMutex_Create(void);
/**
* Destroy a mutex
*
* * p_mutex: pointer to the mutex structure
* * returnvalue: 0 = succeeded, -1 = failed
*/
int NdbMutex_Destroy(NdbMutex* p_mutex);
/**
* Lock a mutex
*
* * p_mutex: pointer to the mutex structure
* * returnvalue: 0 = succeeded, -1 = failed
*/
int NdbMutex_Lock(NdbMutex* p_mutex);
/**
* Unlock a mutex
*
* * p_mutex: pointer to the mutex structure
* * returnvalue: 0 = succeeded, -1 = failed
*/
int NdbMutex_Unlock(NdbMutex* p_mutex);
/**
* Try to lock a mutex
*
* * p_mutex: pointer to the mutex structure
* * returnvalue: 0 = succeeded, -1 = failed
*/
int NdbMutex_Trylock(NdbMutex* p_mutex);
#ifdef __cplusplus
}
#endif
#ifdef __cplusplus
class NdbLockable {
friend class Guard;
public:
NdbLockable() { m_mutex = NdbMutex_Create(); }
~NdbLockable() { NdbMutex_Destroy(m_mutex); }
void lock() { NdbMutex_Lock(m_mutex); }
void unlock(){ NdbMutex_Unlock(m_mutex);}
bool tryLock(){ return NdbMutex_Trylock(m_mutex) == 0;}
NdbMutex* getMutex() {return m_mutex;};
protected:
NdbMutex * m_mutex;
};
class Guard {
public:
Guard(NdbMutex *mtx) : m_mtx(mtx) { NdbMutex_Lock(m_mtx); };
Guard(NdbLockable & l) : m_mtx(l.m_mutex) { NdbMutex_Lock(m_mtx); };
~Guard() { NdbMutex_Unlock(m_mtx); };
private:
NdbMutex *m_mtx;
};
#endif
#endif
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