61 lines
2.3 KiB
C++
61 lines
2.3 KiB
C++
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#include <mach/vm_statistics.h>
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#include <mach/processor_info.h>
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#include <mach/mach_types.h>
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#include <mach/mach_init.h>
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#include <mach/mach_host.h>
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#include <mach/host_info.h>
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#include <mach/mach_error.h>
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#include <mach/vm_map.h>
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#include <mach/mach.h>
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#include <sys/sysctl.h> // for sysctl
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#include <sys/types.h> // for integer types
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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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//
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host_cpu_load_info_data_t _get_cpu_percentage() {
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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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return host_cpu_load_info_data_t();
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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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// 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[CPU_STATE_USER];
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unsigned long long current_system = load1.cpu_ticks[CPU_STATE_SYSTEM];
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unsigned long long current_nice = load1.cpu_ticks[CPU_STATE_NICE];
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unsigned long long current_idle = load1.cpu_ticks[CPU_STATE_IDLE];
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// Next load times
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unsigned long long next_user = load2.cpu_ticks[CPU_STATE_USER];
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unsigned long long next_system = load2.cpu_ticks[CPU_STATE_SYSTEM];
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unsigned long long next_nice = load2.cpu_ticks[CPU_STATE_NICE];
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unsigned long long next_idle = load2.cpu_ticks[CPU_STATE_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>(
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diff_user + diff_system + diff_nice + diff_idle) * 100.0;
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}
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