86 lines
2.5 KiB
C++
86 lines
2.5 KiB
C++
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/*
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* Copyright 2012 Matthew McCormick
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* */
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// This file was Authored by Justin Crawford <Justasic@gmail.com>
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// Based on: github.com/freebsd/freebsd/blob/master/usr.bin/top/machine.c
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// Based on: Apple.cpp for load_string/mem_string and apple's documentation
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#include <sys/types.h>
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#include <unistd.h> // usleep
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#include <sys/sysctl.h>
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#include <sys/types.h>
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#include "common.h"
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#include "cpu.h"
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uint8_t get_cpu_count()
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{
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int cpu_count = 1; // default to 1
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int mib[2] = { CTL_HW, HW_NCPU };
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size_t len = sizeof( cpu_count );
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if(sysctl(mib, 2, &cpu_count, &len, NULL, 0) < 0)
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{
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error("sysctl: error getting cpu count");
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}
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return cpu_count;
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}
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float cpu_percentage( unsigned int cpu_usage_delay )
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{
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int cpu_ctl[] = { CTL_KERN, KERN_CPTIME };
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int32_t load1[CPUSTATES];
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int32_t load2[CPUSTATES];
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size_t size = sizeof( load1 );
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// get cpu times
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if(sysctl(cpu_ctl, 2, &load1, &size, NULL, 0) < 0)
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{
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error("sysctl: error getting cpu stats");
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}
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usleep(cpu_usage_delay);
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// update cpu times
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if(sysctl(cpu_ctl, 2, &load2, &size, NULL, 0) < 0)
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{
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error("sysctl: error getting cpu stats");
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}
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// Current load times
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unsigned long long current_user = load1[CP_USER];
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unsigned long long current_system = load1[CP_SYS];
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unsigned long long current_nice = load1[CP_NICE];
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unsigned long long current_idle = load1[CP_IDLE];
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// Next load times
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unsigned long long next_user = load2[CP_USER];
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unsigned long long next_system = load2[CP_SYS];
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unsigned long long next_nice = load2[CP_NICE];
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unsigned long long next_idle = load2[CP_IDLE];
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// Difference between the two
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unsigned long long diff_user = next_user - current_user;
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unsigned long long diff_system = next_system - current_system;
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unsigned long long diff_nice = next_nice - current_nice;
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unsigned long long diff_idle = next_idle - current_idle;
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return static_cast<float>(diff_user + diff_system + diff_nice) /
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static_cast<float>(diff_user + diff_system + diff_nice + diff_idle) *
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100.0;
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}
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