oshi.driver.unix.aix.perfstat.PerfstatProcess Maven / Gradle / Ivy
/*
* Copyright 2020-2022 The OSHI Project Contributors
* SPDX-License-Identifier: MIT
*/
package oshi.driver.unix.aix.perfstat;
import java.util.Arrays;
import com.sun.jna.platform.unix.aix.Perfstat;
import com.sun.jna.platform.unix.aix.Perfstat.perfstat_id_t;
import com.sun.jna.platform.unix.aix.Perfstat.perfstat_process_t;
import oshi.annotation.concurrent.ThreadSafe;
/**
* Utility to query performance stats for processes
*/
@ThreadSafe
public final class PerfstatProcess {
private static final Perfstat PERF = Perfstat.INSTANCE;
private PerfstatProcess() {
}
/**
* Queries perfstat_process for per-process usage statistics
*
* @return an array of usage statistics
*/
public static perfstat_process_t[] queryProcesses() {
perfstat_process_t process = new perfstat_process_t();
// With null, null, ..., 0, returns total # of elements
int procCount = PERF.perfstat_process(null, null, process.size(), 0);
if (procCount > 0) {
perfstat_process_t[] proct = (perfstat_process_t[]) process.toArray(procCount);
perfstat_id_t firstprocess = new perfstat_id_t(); // name is ""
int ret = PERF.perfstat_process(firstprocess, proct, process.size(), procCount);
if (ret > 0) {
return Arrays.copyOf(proct, ret);
}
}
return new perfstat_process_t[0];
}
}