84 lines
2.4 KiB
C++
84 lines
2.4 KiB
C++
/* vim: tabstop=2 shiftwidth=2 expandtab textwidth=80 linebreak wrap
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*
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* Copyright 2012 Matthew McCormick
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* Copyright 2015 Pawel 'l0ner' Soltys
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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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#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 "error.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 initial 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 updated 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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