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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 */
#include <string.h>
#include "SignalQueue.hpp"
SignalQueue::SignalQueue() {
m_mutex = NdbMutex_Create();
m_cond = NdbCondition_Create();
m_signalQueueHead = NULL;
m_queueSize = 0;
}
SignalQueue::~SignalQueue() {
{
Guard g(m_mutex);
while(m_signalQueueHead != NULL)
delete pop();
}
NdbMutex_Destroy(m_mutex);
m_mutex = NULL;
NdbCondition_Destroy(m_cond);
m_cond = NULL;
}
NdbApiSignal *
SignalQueue::pop() {
NdbApiSignal *ret;
if(m_signalQueueHead == NULL)
return NULL;
ret = m_signalQueueHead->signal;
QueueEntry *old = m_signalQueueHead;
m_signalQueueHead = m_signalQueueHead->next;
delete old;
m_queueSize--;
return ret;
}
void
SignalQueue::receive(void *me, NdbApiSignal *signal) {
SignalQueue *q = (SignalQueue *)me;
q->receive(signal);
}
void
SignalQueue::receive(NdbApiSignal *signal) {
QueueEntry *n = new QueueEntry();
n->signal = signal;
n->next = NULL;
Guard guard(m_mutex);
if(m_signalQueueHead == NULL) {
m_signalQueueHead = n;
m_queueSize++;
NdbCondition_Broadcast(m_cond);
return;
}
QueueEntry *cur = m_signalQueueHead;
while(cur->next != NULL)
cur = cur->next;
cur->next = n;
m_queueSize++;
NdbCondition_Broadcast(m_cond);
}
NdbApiSignal *
SignalQueue::waitFor(int gsn, NodeId nodeid, Uint32 timeout) {
Guard g(m_mutex);
if(m_signalQueueHead == NULL)
NdbCondition_WaitTimeout(m_cond, m_mutex, timeout);
if(m_signalQueueHead == NULL)
return NULL;
if(gsn != 0 && m_signalQueueHead->signal->readSignalNumber() != gsn)
return NULL;
if(nodeid != 0 &&
refToNode(m_signalQueueHead->signal->theSendersBlockRef) != nodeid)
return NULL;
return pop();
}
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