ios cpu 使用率

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#include <sys/sysctl.h>#include <sys/types.h>#include <mach/mach.h>#include <mach/processor_info.h>#include <mach/mach_host.h>

ivars:

processor_info_array_t cpuInfo, prevCpuInfo;mach_msg_type_number_t numCpuInfo, numPrevCpuInfo;unsigned numCPUs;NSTimer *updateTimer;NSLock *CPUUsageLock;

*.m file

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification{        int mib[2U] = { CTL_HW, HW_NCPU };    size_t sizeOfNumCPUs = sizeof(numCPUs);    int status = sysctl(mib, 2U, &numCPUs, &sizeOfNumCPUs, NULL, 0U);    if(status)        numCPUs = 1;    CPUUsageLock = [[NSLock alloc] init];    updateTimer = [[NSTimer scheduledTimerWithTimeInterval:3                                                    target:self                                                  selector:@selector(updateInfo:)                                                  userInfo:nil                                                   repeats:YES] retain];    }- (void)updateInfo:(NSTimer *)timer{    natural_t numCPUsU = 0U;    kern_return_t err = host_processor_info(mach_host_self(), PROCESSOR_CPU_LOAD_INFO, &numCPUsU, &cpuInfo, &numCpuInfo);    if(err == KERN_SUCCESS) {        [CPUUsageLock lock];        for(unsigned i = 0U; i < numCPUs; ++i) {            float inUse, total;            if(prevCpuInfo) {                inUse = (                         (cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_USER]   - prevCpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_USER])                         + (cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_SYSTEM] - prevCpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_SYSTEM])                         + (cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_NICE]   - prevCpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_NICE])                         );                total = inUse + (cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_IDLE] - prevCpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_IDLE]);            } else {                inUse = cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_USER] + cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_SYSTEM] + cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_NICE];                total = inUse + cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_IDLE];            }            NSLog(@"Core: %u Usage: %f",i,inUse / total);        }        [CPUUsageLock unlock];        if(prevCpuInfo) {            size_t prevCpuInfoSize = sizeof(integer_t) * numPrevCpuInfo;            vm_deallocate(mach_task_self(), (vm_address_t)prevCpuInfo, prevCpuInfoSize);        }        prevCpuInfo = cpuInfo;        numPrevCpuInfo = numCpuInfo;        cpuInfo = NULL;        numCpuInfo = 0U;    } else {        NSLog(@"Error!");        [NSApp terminate:nil];    }}

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