com.redismq.samples.rocket.LibC Maven / Gradle / Ivy
/*
* 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.
*/
package com.redismq.samples.rocket;
import com.sun.jna.*;
public interface LibC extends Library {
LibC INSTANCE = (LibC) Native.loadLibrary(Platform.isWindows() ? "msvcrt" : "c", LibC.class);
int MADV_WILLNEED = 3;
int MADV_DONTNEED = 4;
int MCL_CURRENT = 1;
int MCL_FUTURE = 2;
int MCL_ONFAULT = 4;
/* sync memory asynchronously */
int MS_ASYNC = 0x0001;
/* invalidate mappings & caches */
int MS_INVALIDATE = 0x0002;
/* synchronous memory sync */
int MS_SYNC = 0x0004;
//锁定内存空间不被swap
int mlock(Pointer var1, NativeLong var2);
//释放
int munlock(Pointer var1, NativeLong var2);
/**
* c语言的指令，预读文件数据到内核缓存中。因为mmap只有发生缺页中断才读取
*/
int madvise(Pointer var1, NativeLong var2, int var3);
//对指定的数组参数赋值，len是赋值数组的中元素的个数，第二个参数是value
Pointer memset(Pointer p, int v, long len);
//锁定全部内存空间 flags可取两个值：MCL_CURRENT,MCL_FUTURE
//MCL_CURRENT: 表示对所有已经映射到进程地址空间的页上锁
//MCL_FUTURE: 表示对所有将来映射到进程地空间的页都上锁。
int mlockall(int flags);
//把在该内存段的某个部分或者整段中的修改写回到被映射的文件中（或者从被映射文件里读出）。
int msync(Pointer p, NativeLong length, int flags);
}