gps信号 《高性能iOS 应用开发》之降低你 APP 的电量消耗(6)

我们也可以得到应用对 CPU 的利用率

// 需要导入这两个头文件
#import 
#import 
- (float)apUUsage{
    kern_return_t kr;
    task_info_data_t info;
    mach_msg_type_number_t infoCount = TASK_INFO_MAX;    
    kr = task_info(mach_task_self(), TASK_BASIC_INFO, info, &infoCount);    
    if (kr != KERN_SUCCESS) {
        return -1;
    }    
    thread_array_t thread_list;
    mach_msg_type_number_t thread_count;
    thread_info_data_t thinfo;
    mach_msg_type_number_t thread_info_count;
    thread_basic_info_t basic_info_th;
    
    kr = task_threads(mach_task_self(), &thread_list, &thread_count);
    if (kr != KERN_SUCCESS) {
        return -1;
    }
    float tot_cpu = 0;
    int j;
    for (j = 0; j < thread_count; j++) {
        thread_info_count = THREAD_INFO_MAX;
        kr = thread_info(thread_list[j], THREAD_BASIC_INFO, thinfo, &thread_info_count);
        
        if (kr != KERN_SUCCESS) {
            return -1;
        }        
        basic_info_th = (thread_basic_info_t)thinfo;
        if (!(basic_info_th -> flags & TH_FLAGS_IDLE)) {
            tot_cpu += basic_info_th -> cpu_usage / TH_USAGE_SCALE * 100.0;
        }
    }
    vm_deallocate(mach_task_self(), (vm_offset_t)thread_list, thread_count * sizeof(thread_t));
    return tot_cpu;
    
}

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