#include <rcu.h>

// These tags represent variables protected by the RCU critical section.
// The variables are versioned: every version associates each variable with a
// value.
rcu_data_tag_t tag1;
rcu_data_tag_t tag2;

void
reader()
{
    // Enter the critical section.
    rcu_reader_enter();

    // Get the values corresponding to the latest version this reader observes.
    rcu_version_t latest = rcu_get_latest_version();
    rcu_value_t value1 = rcu_read(tag1, latest);
    rcu_value_t value2 = rcu_read(tag1, latest);

    // Use value1 and value2

    // Let any writer know that this reader no longer requires this version of
    // the values.
    rcu_release_version(latest);

    // Exit the critical section.
    rcu_reader_exit();
}

void
writer()
{
    // Enter the critical section.
    rcu_writer_enter();

    // Create a new version identifier.
    rcu_version_t old_version = rcu_get_latest_version();
    rcu_version_t new_version = rcu_create_version();

    // Provide new values for this version.
    rcu_value_t new_value1 = SOME_VALUE_1;
    rcu_value_t new_value2 = SOME_VALUE_2;
    rcu_write(tag1, new_value1, new_version);
    rcu_write(tag2, new_value2, new_version);

    // Publish the new version.
    rcu_set_latest_version(new_version);

    // Optional:
    // Wait for readers to stop using the old version and then discard it.
    rcu_wait_readers(old_version);
    rcu_remove_version(old_version);

    // Exit the critical section.
    rcu_writer_exit();
}