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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.nativec;
import com.sun.jna.Structure;
/**
* Gives access to the information provided by the C library mallinfo2() function.
*
* @author baldersheim
*/
public class MallInfo2 extends NativeHeap {
private final static Throwable initException = NativeC.loadLibrary(MallInfo2.class);
public static Throwable init() {
return initException;
}
@Structure.FieldOrder({"arena", "ordblks", "smblks", "hblks", "hblkhd", "usmblks", "fsmblks", "uordblks", "fordblks", "keepcost"})
public static class MallInfo2Struct extends Structure {
public static class ByValue extends MallInfo2Struct implements Structure.ByValue { }
public long arena; /* Non-mmapped space allocated (bytes) */
public long ordblks; /* Number of free chunks */
public long smblks; /* Number of free fastbin blocks */
public long hblks; /* Number of mmapped regions */
public long hblkhd; /* Space allocated in mmapped regions (bytes) */
public long usmblks; /* See below */
public long fsmblks; /* Space in freed fastbin blocks (bytes) */
public long uordblks; /* Total allocated space (bytes) */
public long fordblks; /* Total free space (bytes) */
public long keepcost; /* Top-most, releasable space (bytes) */
}
private static native MallInfo2Struct.ByValue mallinfo2();
private final MallInfo2Struct mallinfo;
public MallInfo2() {
mallinfo = mallinfo2();
}
@Override
public long usedSize() {
return mallinfo.uordblks;
}
@Override
public long totalSize() {
return mallinfo.arena;
}
@Override
public long availableSize() {
return mallinfo.fordblks;
}
}
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