--- /dev/null
+# 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 makefile is purposefully kept simple to support GNU and BSD make.
+
+EXAMPLE_NAME = cds_wfcq_splice
+
+SOURCES = $(EXAMPLE_NAME).c
+OBJECTS = $(EXAMPLE_NAME).o
+BINARY = $(EXAMPLE_NAME)
+LIBS = -lurcu-common
+
+include ../Makefile.examples.template
--- /dev/null
+/*
+ * 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 splice nodes from a source wfcqueue A into
+ * a destination wfcqueue B.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <urcu/wfcqueue.h> /* Wait-free concurrent queue */
+#include <urcu/compiler.h> /* For CAA_ARRAY_SIZE */
+
+/*
+ * Nodes populated into the queue.
+ */
+struct mynode {
+ int value; /* Node content */
+ struct cds_wfcq_node node; /* Chaining in queue */
+};
+
+static
+int enqueue_values(struct cds_wfcq_head *head,
+ struct cds_wfcq_tail *tail,
+ int *values,
+ size_t nr_values)
+{
+ int ret = 0;
+ unsigned int i;
+
+ for (i = 0; i < nr_values; i++) {
+ struct mynode *node;
+
+ node = malloc(sizeof(*node));
+ if (!node) {
+ ret = -1;
+ goto end;
+ }
+ cds_wfcq_node_init(&node->node);
+ node->value = values[i];
+ cds_wfcq_enqueue(head, tail, &node->node);
+ }
+end:
+ return ret;
+}
+
+static
+void print_queue(struct cds_wfcq_head *head,
+ struct cds_wfcq_tail *tail,
+ const char *qname)
+{
+ struct cds_wfcq_node *qnode;
+
+ printf("%s:", qname);
+ __cds_wfcq_for_each_blocking(head, tail, qnode) {
+ struct mynode *node =
+ caa_container_of(qnode, struct mynode, node);
+ printf(" %d", node->value);
+ }
+ printf("\n");
+}
+
+int main(int argc, char **argv)
+{
+ int values_A[] = { -5, 42, 36, 24, };
+ int values_B[] = { 200, 300, 400, };
+ struct cds_wfcq_head head_A; /* Queue A head */
+ struct cds_wfcq_tail tail_A; /* Queue A tail */
+ struct cds_wfcq_head head_B; /* Queue B head */
+ struct cds_wfcq_tail tail_B; /* Queue B tail */
+ int ret = 0;
+
+ cds_wfcq_init(&head_A, &tail_A);
+ /* Enqueue nodes into A. */
+ ret = enqueue_values(&head_A, &tail_A, values_A,
+ CAA_ARRAY_SIZE(values_A));
+ if (ret)
+ goto end;
+ cds_wfcq_init(&head_B, &tail_B);
+ /* Enqueue nodes into B. */
+ ret = enqueue_values(&head_B, &tail_B, values_B,
+ CAA_ARRAY_SIZE(values_B));
+ if (ret)
+ goto end;
+
+ print_queue(&head_A, &tail_A, "queue A content before splice");
+ print_queue(&head_B, &tail_B, "queue B content before splice");
+
+ /*
+ * Splice nodes from A into B.
+ */
+ printf("Splicing queue A into queue B\n");
+ (void) cds_wfcq_splice_blocking(&head_B, &tail_B,
+ &head_A, &tail_A);
+
+ print_queue(&head_A, &tail_A, "queue A content after splice");
+ print_queue(&head_B, &tail_B, "queue B content after splice");
+end:
+ return ret;
+}
projects / userspace-rcu.git / commitdiff
