Global message queue id changes on msgrcv function [closed] - c++

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There are 2 message queues and 2 queue ids. When I call msgrcv, the queue id that is not associated with this msgrcv call gets altered. Its declared globally. When I make it static global the value does not change. But I need to know the root cause of this issue. The code snippet is below
int xmlrpcqid;
rtspbuf rpcbuf;
int statusqid;
msqbuf sbuf;
static void *getXmlResponse(void *arg);
printf ("*******msg qid position 1 = %d\n", statusqid);
while(!eventLoopWatchVariable)
{
printf ("*******msg qid position 2 = %d \n", statusqid);
if(msgrcv(xmlrpcqid, &rpcbuf, sizeof(rtspbuf), 0, MSG_NOERROR) < 0)
{
printf("msgrcv Fail \n");
}
else {
printf ("*******msg qid 3 = %d \n", statusqid);
}
}
// not adding remaining code
}
int main {
if ((xmlrpcqid = msgget (1256, IPC_CREAT | 0666 )) < 0)
printf ("login msgget failed\n");
if ((statusqid = msgget (1234, IPC_CREAT | 0666 )) < 0)
printf ("status msgget failed\n");
pthread_t xmlResponse_thr = -1;
if(pthread_create(&xmlResponse_thr, NULL, getXmlResponse, NULL))
{
printf("pthread_create failed for getXmlResponse\n");
return -1;
}
}