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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 __SIGNALQUEUE_HPP_INCLUDED__
#define __SIGNALQUEUE_HPP_INCLUDED__
#include <NdbApiSignal.hpp>
#include <NdbMutex.h>
#include <NdbCondition.h>
#include <Vector.hpp>
/* XXX Look for an already existing definition */
#define DEFAULT_TIMEOUT 5000
class SignalQueue {
public:
typedef void (* SignalHandler)(void *obj, int gsn, NdbApiSignal *signal);
SignalQueue();
~SignalQueue();
/**
* Static wrapper making it possible to call receive without knowing the
* type of the receiver
*/
static void receive(void *me, NdbApiSignal *signal);
/**
* Enqueues a signal, and notifies any thread waiting for signals.
*/
void receive(NdbApiSignal *signal);
NdbApiSignal *waitFor(int gsn,
NodeId nodeid = 0,
Uint32 timeout = DEFAULT_TIMEOUT);
template<class T> bool waitFor(Vector<T> &t,
T *&handler,
NdbApiSignal *&signal,
Uint32 timeout = DEFAULT_TIMEOUT);
private:
NdbMutex *m_mutex; /* Locks all data in SignalQueue */
NdbCondition *m_cond; /* Notifies about new signal in the queue */
/**
* Returns the last recently received signal. Must be called with
* m_mutex locked.
* The caller takes responsibility for deleting the returned object.
*
* @returns NULL if failed, or a received signal
*/
NdbApiSignal *pop();
class QueueEntry {
public:
NdbApiSignal *signal;
QueueEntry *next;
};
QueueEntry *m_signalQueueHead; /** Head of the queue.
* New entries added on the tail
*/
};
template<class T> bool
SignalQueue::waitFor(Vector<T> &t,
T *&handler,
NdbApiSignal *&signal,
Uint32 timeout) {
Guard g(m_mutex);
if(m_signalQueueHead == NULL)
NdbCondition_WaitTimeout(m_cond, m_mutex, timeout);
if(m_signalQueueHead == NULL)
return false;
for(size_t i = 0; i < t.size(); i++) {
if(t[i].check(m_signalQueueHead->signal)) {
handler = &t[i];
signal = pop();
return true;
}
}
return false;
}
#endif /* !__SIGNALQUEUE_HPP_INCLUDED__ */
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