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29 #import <mach/mach_init.h>
31 #import <mach/task_info.h>
35 static const int64_t microsecondsPerSecond = 1000000;
37 static int64_t timeValueToMicroseconds(const time_value_t& value)
39 int64_t result = value.seconds;
40 result *= microsecondsPerSecond;
41 result += value.microseconds;
45 std::optional<CPUTime> CPUTime::get()
47 // Account for current threads.
48 task_thread_times_info threadInfoData;
49 mach_msg_type_number_t threadInfoCount = TASK_THREAD_TIMES_INFO_COUNT;
50 kern_return_t result = task_info(mach_task_self(), TASK_THREAD_TIMES_INFO, reinterpret_cast<task_info_t>(&threadInfoData), &threadInfoCount);
51 if (result != KERN_SUCCESS)
54 int64_t userTime = timeValueToMicroseconds(threadInfoData.user_time);
55 int64_t systemTime = timeValueToMicroseconds(threadInfoData.system_time);
57 // Account for termined threads.
58 task_basic_info taskInfoData;
59 mach_msg_type_number_t taskInfoCount = TASK_BASIC_INFO_COUNT;
60 result = task_info(mach_task_self(), TASK_BASIC_INFO, reinterpret_cast<task_info_t>(&taskInfoData), &taskInfoCount);
61 if (result != KERN_SUCCESS)
64 userTime += timeValueToMicroseconds(taskInfoData.user_time);
65 systemTime += timeValueToMicroseconds(taskInfoData.system_time);
67 return CPUTime { MonotonicTime::now(), Seconds::fromMicroseconds(userTime), Seconds::fromMicroseconds(systemTime) };