Created
March 11, 2015 07:44
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查看app cpu的占用比例
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| #import <mach/mach.h> | |
| float cpu_usage() | |
| { | |
| kern_return_t kr; | |
| task_info_data_t tinfo; | |
| mach_msg_type_number_t task_info_count; | |
| task_info_count = TASK_INFO_MAX; | |
| kr = task_info(mach_task_self(), TASK_BASIC_INFO, (task_info_t)tinfo, &task_info_count); | |
| if (kr != KERN_SUCCESS) { | |
| return -1; | |
| } | |
| task_basic_info_t basic_info; | |
| 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; | |
| uint32_t stat_thread = 0; // Mach threads | |
| basic_info = (task_basic_info_t)tinfo; | |
| // get threads in the task | |
| kr = task_threads(mach_task_self(), &thread_list, &thread_count); | |
| if (kr != KERN_SUCCESS) { | |
| return -1; | |
| } | |
| if (thread_count > 0) | |
| stat_thread += thread_count; | |
| long tot_sec = 0; | |
| long tot_usec = 0; | |
| 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, | |
| (thread_info_t)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_sec = tot_sec + basic_info_th->user_time.seconds + basic_info_th->system_time.seconds; | |
| tot_usec = tot_usec + basic_info_th->system_time.microseconds + basic_info_th->system_time.microseconds; | |
| tot_cpu = tot_cpu + basic_info_th->cpu_usage / (float)TH_USAGE_SCALE * 100.0; | |
| } | |
| } // for each thread | |
| kr = vm_deallocate(mach_task_self(), (vm_offset_t)thread_list, thread_count * sizeof(thread_t)); | |
| assert(kr == KERN_SUCCESS); | |
| return tot_cpu; | |
| } |
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