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/*
* Copyright (C) 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
*
* Permission is hereby granted to use or copy this program for any
* purpose, provided the above notices are retained on all copies.
* Permission to modify the code and to distribute modified code is
* granted, provided the above notices are retained, and a notice that
* the code was modified is included with the above copyright notice.
*
* This example shows how to enqueue nodes into a RCU lock-free queue.
* This queue requires using a RCU scheme.
*/
#include <stdio.h>
#include <stdlib.h>
#include <urcu.h> /* RCU flavor */
#include <urcu/rculfqueue.h> /* RCU Lock-free queue */
#include <urcu/compiler.h> /* For CAA_ARRAY_SIZE */
/*
* Nodes populated into the queue.
*/
struct mynode {
int value; /* Node content */
struct cds_lfq_node_rcu node; /* Chaining in queue */
};
int main(int argc, char **argv)
{
int values[] = { -5, 42, 36, 24, };
struct cds_lfq_queue_rcu myqueue; /* Queue */
unsigned int i;
int ret = 0;
/*
* Each thread need using RCU read-side need to be explicitly
* registered.
*/
rcu_register_thread();
cds_lfq_init_rcu(&myqueue, call_rcu);
/*
* Enqueue nodes.
*/
for (i = 0; i < CAA_ARRAY_SIZE(values); i++) {
struct mynode *node;
node = malloc(sizeof(*node));
if (!node) {
ret = -1;
goto end;
}
cds_lfq_node_init_rcu(&node->node);
node->value = values[i];
/*
* Both enqueue and dequeue need to be called within RCU
* read-side critical section.
*/
rcu_read_lock();
cds_lfq_enqueue_rcu(&myqueue, &node->node);
rcu_read_unlock();
}
end:
rcu_unregister_thread();
return ret;
}
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