80d70b7a4d
On 64bit system KERN_CPTIME systctl gets returned as 64bit uint. On 32bit system it's returned as 32bit uint. This is not documented anywhere (or maybe I've missed it). I've added preprocessor test for 64bit system.
94 lines
2.8 KiB
C++
94 lines
2.8 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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// on 64bit systems KERN_CPTIME gets reported as 64bit
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// uint. Detect 64bit system and define array to hold the
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// stats accordingly.
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// NOTE: the following test may need to be extended to cover
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// more 64bit platforms.
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#if __x86_64__ || __ppc64__
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u_int64_t load1[CPUSTATES];
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u_int64_t load2[CPUSTATES];
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#else
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u_int32_t load1[CPUSTATES];
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u_int32_t load2[CPUSTATES];
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#endif
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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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