问题描述
我当前正在使用此代码：
public func cpuUsage（_ cpuModel：cpuIosModel？）->浮动{ 警卫让cpuModel = cpuModel else {
print("cpuUsage is empty")
return -1
}
var kr: kern_return_t
var task_info_count: mach_msg_type_number_t
task_info_count = mach_msg_type_number_t(TASK_INFO_MAX)
var tinfo = [integer_t](repeating: 0,count: Int(task_info_count))
kr = task_info(mach_task_self_,task_flavor_t(TASK_BASIC_INFO),&tinfo,&task_info_count)
if kr != KERN_SUCCESS {
return -1
}
var thread_list: thread_act_array_t? = UnsafeMutablePointer(mutating: [thread_act_t]())
var thread_count: mach_msg_type_number_t = 0
defer {
if let thread_list = thread_list {
vm_deallocate(mach_task_self_,vm_address_t(UnsafePointer(thread_list).pointee),vm_size_t(thread_count))
}
}
kr = task_threads(mach_task_self_,&thread_list,&thread_count)
if kr != KERN_SUCCESS {
return -1
}
var tot_cpu: Float = 0
var usr_space_time: Int = 0 //time in ms
var system_space_time:Int = 0 //time in ms
var thread_sleep_time: Int = 0 // time in sec
var counter:Int = 0
if let thread_list = thread_list {
for j in 0 ..< Int(thread_count) {
var thread_info_count = mach_msg_type_number_t(THREAD_INFO_MAX)
var thinfo = [integer_t](repeating: 0,count: Int(thread_info_count))
kr = thread_info(thread_list[j],thread_flavor_t(THREAD_BASIC_INFO),&thinfo,&thread_info_count)
let threadBasicInfo = convertThreadInfoToThreadBasicInfo(thinfo)
if threadBasicInfo.flags != TH_FLAGS_IDLE {
tot_cpu += (Float(threadBasicInfo.cpu_usage) / Float(TH_USAGE_SCALE)) * 100.0
usr_space_time += Int(threadBasicInfo.user_time.microseconds/1000)
system_space_time += Int(threadBasicInfo.system_time.microseconds/1000)
thread_sleep_time += Int(threadBasicInfo.sleep_time)
counter = counter + 1
}
} // for each thread
if counter != 0 {
//setcpuData(tot_cpu,usr_space_time,system_space_time)
setcpuData(tot_cpu: tot_cpu,usr_space_time: usr_space_time,system_space_time: system_space_time,thread_sleep_time: thread_sleep_time,cpuModel: cpuModel)
print(usr_space_time)
return -1
}
}
return tot_cpu
}
fileprivate func convertThreadInfoToThreadBasicInfo(_ threadInfo: [integer_t]) -> thread_basic_info {
var result = thread_basic_info()
result.user_time = time_value_t(seconds: threadInfo[0],microseconds: threadInfo[1])
result.system_time = time_value_t(seconds: threadInfo[2],microseconds: threadInfo[3])
result.cpu_usage = threadInfo[4]
result.policy = threadInfo[5]
result.run_state = threadInfo[6]
result.flags = threadInfo[7]
result.suspend_count = threadInfo[8]
result.sleep_time = threadInfo[9]
return result
}
但这总是将tot_cpu设为0。如果您有有效的代码，请提供帮助。我也从互联网上获得了这段代码。有人可以解释一下为什么convertThreadInfoToThreadBasicInfo（）函数中的threadInfo [4]保持cpu使用率值。这是预定义的东西吗？
解决方法
我不确定这是否是您要寻找的，但是您可以看一下此实现：
func cpuUsage() -> Double {
var totalUsageOfCPU: Double = 0.0
var threadsList = UnsafeMutablePointer(mutating: [thread_act_t]())
var threadsCount = mach_msg_type_number_t(0)
let threadsResult = withUnsafeMutablePointer(to: &threadsList) {
return $0.withMemoryRebound(to: thread_act_array_t?.self,capacity: 1) {
task_threads(mach_task_self_,$0,&threadsCount)
}
}
if threadsResult == KERN_SUCCESS {
for index in 0..<threadsCount {
var threadInfo = thread_basic_info()
var threadInfoCount = mach_msg_type_number_t(THREAD_INFO_MAX)
let infoResult = withUnsafeMutablePointer(to: &threadInfo) {
$0.withMemoryRebound(to: integer_t.self,capacity: 1) {
thread_info(threadsList[Int(index)],thread_flavor_t(THREAD_BASIC_INFO),&threadInfoCount)
}
}
guard infoResult == KERN_SUCCESS else {
break
}
let threadBasicInfo = threadInfo as thread_basic_info
if threadBasicInfo.flags & TH_FLAGS_IDLE == 0 {
totalUsageOfCPU = (totalUsageOfCPU + (Double(threadBasicInfo.cpu_usage) / Double(TH_USAGE_SCALE) * 100.0))
}
}
}
vm_deallocate(mach_task_self_,vm_address_t(UInt(bitPattern: threadsList)),vm_size_t(Int(threadsCount) * MemoryLayout<thread_t>.stride))
return totalUsageOfCPU
}