RuntimeEventSourceHelper.cs

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namespace System.Diagnostics.Tracing;
 
internal static class RuntimeEventSourceHelper
{
    private static long s_prevProcUserTime;
 
    private static long s_prevProcKernelTime;
 
    private static long s_prevSystemUserTime;
 
    private static long s_prevSystemKernelTime;
 
    internal static int GetCpuUsage()
    {
        int result = 0;
        if (Interop.Kernel32.GetProcessTimes(Interop.Kernel32.GetCurrentProcess(), out var _, out var exit, out var kernel, out var user) && Interop.Kernel32.GetSystemTimes(out exit, out var kernel2, out var user2))
        {
            long num = user - s_prevProcUserTime + (kernel - s_prevProcKernelTime);
            long num2 = kernel2 - s_prevSystemUserTime + (user2 - s_prevSystemKernelTime);
            if (s_prevSystemUserTime != 0L && s_prevSystemKernelTime != 0L && num2 != 0L)
            {
                result = (int)(num * 100 / num2);
            }
            s_prevProcUserTime = user;
            s_prevProcKernelTime = kernel;
            s_prevSystemUserTime = kernel2;
            s_prevSystemKernelTime = user2;
        }
        return result;
    }
}