81 lines
2.7 KiB
C++
81 lines
2.7 KiB
C++
/*
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* Copyright 2012 Matthew McCormick
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* Copyright 2013 Justin Crawford <Justasic@gmail.com>
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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 <mach/mach.h>
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#include <unistd.h> // usleep()
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#include "cpu.h"
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uint32_t get_cpu_count()
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{
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return sysconf( _SC_NPROCESSORS_ONLN );
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}
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// OSX or BSD based system, use BSD APIs instead
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// See: http://www.opensource.apple.com/source/xnu/xnu-201/osfmk/mach/host_info.h
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// and: http://web.mit.edu/darwin/src/modules/xnu/osfmk/man/
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host_cpu_load_info_data_t _get_cpu_percentage()
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{
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kern_return_t error;
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mach_msg_type_number_t count;
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host_cpu_load_info_data_t r_load;
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mach_port_t mach_port;
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count = HOST_CPU_LOAD_INFO_COUNT;
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mach_port = mach_host_self();
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error = host_statistics(mach_port, HOST_CPU_LOAD_INFO,
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( host_info_t )&r_load, &count );
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if ( error != KERN_SUCCESS )
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{
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return host_cpu_load_info_data_t();
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}
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return r_load;
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}
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float cpu_percentage( unsigned int cpu_usage_delay )
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{
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// Get the load times from the XNU kernel
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host_cpu_load_info_data_t load1 = _get_cpu_percentage();
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usleep( cpu_usage_delay );
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host_cpu_load_info_data_t load2 = _get_cpu_percentage();
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// Current load times
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unsigned long long current_user = load1.cpu_ticks[CP_USER];
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unsigned long long current_system = load1.cpu_ticks[CP_SYS];
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unsigned long long current_nice = load1.cpu_ticks[CP_NICE];
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unsigned long long current_idle = load1.cpu_ticks[CP_IDLE];
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// Next load times
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unsigned long long next_user = load2.cpu_ticks[CP_USER];
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unsigned long long next_system = load2.cpu_ticks[CP_SYS];
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unsigned long long next_nice = load2.cpu_ticks[CP_NICE];
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unsigned long long next_idle = load2.cpu_ticks[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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