/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

/**
 * @file thread_native_attrs.c
 * @brief Hythread priority related functions
 */

#include <open/hythread_ext.h>
#include "thread_private.h"

/**
 * Set a thread's execution priority.
 * 
 * @param[in] thread a thread
 * @param[in] priority
 * Use the following symbolic constants for priorities:<br>
 *                              HYTHREAD_PRIORITY_MAX<br>
 *                              HYTHREAD_PRIORITY_USER_MAX<br>
 *                              HYTHREAD_PRIORITY_NORMAL<br>
 *                              HYTHREAD_PRIORITY_USER_MIN<br>
 *                              HYTHREAD_PRIORITY_MIN<br>
 * 
 * @returns 0 on success or negative value on failure (priority wasn't changed)
 */
IDATA VMCALL hythread_set_priority(hythread_t thread, UDATA priority) {
    int r = port_thread_set_priority(thread->os_handle, priority);
    if (r) return r;
    thread->priority = priority;
    return 0;
}

/**
 * Returns the priority for the <code>thread</code>.
 *
 * @param[in] thread those attribute is read
 */
UDATA VMCALL hythread_get_priority(hythread_t thread) {
    return thread->priority;
}