float cpu_percentage( unsigned int cpu_usage_delay )
{
// Get the load times from the XNU kernel
host_cpu_load_info_data_t load1 = _get_cpu_percentage();
usleep(cpu_usage_delay);
host_cpu_load_info_data_t load2 = _get_cpu_percentage();
// Current load times
unsigned long long current_user = load1.cpu_ticks[CPU_STATE_USER];
unsigned long long current_system = load1.cpu_ticks[CPU_STATE_SYSTEM];
unsigned long long current_nice = load1.cpu_ticks[CPU_STATE_NICE];
unsigned long long current_idle = load1.cpu_ticks[CPU_STATE_IDLE];
// Next load times
unsigned long long next_user = load2.cpu_ticks[CPU_STATE_USER];
unsigned long long next_system = load2.cpu_ticks[CPU_STATE_SYSTEM];
unsigned long long next_nice = load2.cpu_ticks[CPU_STATE_NICE];
unsigned long long next_idle = load2.cpu_ticks[CPU_STATE_IDLE];
// Difference between the two
unsigned long long diff_user = next_user - current_user;
unsigned long long diff_system = next_system - current_system;
unsigned long long diff_nice = next_nice - current_nice;
unsigned long long diff_idle = next_idle - current_idle;
return static_cast<float>(diff_user + diff_system + diff_nice)/static_cast<float>(diff_user + diff_system + diff_nice + diff_idle)*100.0;
}
float cpu_percentage( unsigned int cpu_usage_delay )
{
// Get the load times from the XNU kernel
host_cpu_load_info_data_t load1 = _get_cpu_percentage();
usleep(cpu_usage_delay);
host_cpu_load_info_data_t load2 = _get_cpu_percentage();
// Current load times
unsigned long long current_user = load1.cpu_ticks[CPU_STATE_USER];
unsigned long long current_system = load1.cpu_ticks[CPU_STATE_SYSTEM];
unsigned long long current_nice = load1.cpu_ticks[CPU_STATE_NICE];
unsigned long long current_idle = load1.cpu_ticks[CPU_STATE_IDLE];
// Next load times
unsigned long long next_user = load2.cpu_ticks[CPU_STATE_USER];
unsigned long long next_system = load2.cpu_ticks[CPU_STATE_SYSTEM];
unsigned long long next_nice = load2.cpu_ticks[CPU_STATE_NICE];
unsigned long long next_idle = load2.cpu_ticks[CPU_STATE_IDLE];
// Difference between the two
unsigned long long diff_user = next_user - current_user;
unsigned long long diff_system = next_system - current_system;
unsigned long long diff_nice = next_nice - current_nice;
unsigned long long diff_idle = next_idle - current_idle;
#else // Linux
float cpu_percentage( unsigned int cpu_usage_delay )
{
std::string stat_line;
size_t line_start_pos;
size_t line_end_pos;
unsigned long long current_user;
unsigned long long current_system;
unsigned long long current_nice;
unsigned long long current_idle;
unsigned long long next_user;
unsigned long long next_system;
unsigned long long next_nice;
unsigned long long next_idle;
unsigned long long diff_user;
unsigned long long diff_system;
unsigned long long diff_nice;
unsigned long long diff_idle;
std::istringstream iss;
std::ifstream stat_file("/proc/stat");
getline(stat_file, stat_line);
stat_file.close();
// skip "cpu"
line_start_pos = stat_line.find_first_not_of(" ", 3);
line_end_pos = stat_line.find_first_of(' ', line_start_pos);
line_end_pos = stat_line.find_first_of(' ', line_end_pos + 1);
line_end_pos = stat_line.find_first_of(' ', line_end_pos + 1);
line_end_pos = stat_line.find_first_of(' ', line_end_pos + 1);
iss.str( stat_line.substr( line_start_pos, line_end_pos - line_start_pos ) );
iss >> current_user >> current_nice >> current_system >> current_idle;
iss.clear();
usleep( cpu_usage_delay );
stat_file.open("/proc/stat");
getline(stat_file, stat_line);
stat_file.close();
// skip "cpu"
line_start_pos = stat_line.find_first_not_of(" ", 3);
line_end_pos = stat_line.find_first_of(' ', line_start_pos);
line_end_pos = stat_line.find_first_of(' ', line_end_pos + 1);
line_end_pos = stat_line.find_first_of(' ', line_end_pos + 1);
line_end_pos = stat_line.find_first_of(' ', line_end_pos + 1);
iss.str( stat_line.substr( line_start_pos, line_end_pos - line_start_pos ) );
iss >> next_user >> next_nice >> next_system >> next_idle;
iss.clear();
diff_user = next_user - current_user;
diff_system = next_system - current_system;
diff_nice = next_nice - current_nice;
diff_idle = next_idle - current_idle;
#endif // platform
return static_cast<float>(diff_user + diff_system + diff_nice)/static_cast<float>(diff_user + diff_system + diff_nice + diff_idle)*100.0;
}
