one.nio.os.Proc Maven / Gradle / Ivy

/*
 * Copyright 2015 Odnoklassniki Ltd, Mail.Ru Group
 *
 * Licensed 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.
 */

package one.nio.os;

public final class Proc {
    public static final boolean IS_SUPPORTED = NativeLibrary.IS_SUPPORTED;

    public static final int IOPRIO_CLASS_RT   = 1 << 13;
    public static final int IOPRIO_CLASS_BE   = 2 << 13;
    public static final int IOPRIO_CLASS_IDLE = 3 << 13;

    /*
     * POSIX scheduling policies
     *  SCHED_OTHER   the standard round-robin time-sharing policy;
     *  SCHED_BATCH   for "batch" style execution of processes; and
     *  SCHED_IDLE    for running very low priority background jobs.
     * @see #sched_setscheduler
     * @see bits/sched.h
     */
    public static final int SCHED_OTHER = 0;
    public static final int SCHED_BATCH = 3;
    public static final int SCHED_IDLE = 5;

    public static native int gettid();
    public static native int getpid();
    public static native int getppid();

    public static native int sched_setaffinity(int pid, long mask);
    public static native long sched_getaffinity(int pid);

    public static native int ioprio_set(int pid, int ioprio);
    public static native int ioprio_get(int pid);

    /**
     * @param pid pid or tid. 0 for current thread
     * @return 0 on success or errno on failure
     */
    public static native int sched_setscheduler(int pid, int policy);

    /**
     * @param pid pid or tid. 0 for current thread
     * @return the policy for the thread (a nonnegative integer)
     */
    public static native int sched_getscheduler(int pid);
}