/// <summary>
/// Estimates memory consumption
/// </summary>
/// <exception cref="InvalidOperationException">Process has exited</exception>
/// <returns></returns>
public ProcessMemoryInfo GetMemoryInfo(int pid)
{
var handle = IntPtr.Zero;
try
{
handle = ProcessUtility.OpenLimitedQueryInformationProcessHandle(pid);
EnsureProcessIsRunning(handle, pid);
if (!PsApi.GetProcessMemoryInfo(handle, out var counters))
{
Win32ExceptionUtility.Throw();
}
return(new ProcessMemoryInfo
{
// use PrivateUsage instead of PagefileUsage because PagefileUsage is always zero on Windows 7, Windows Server 2008 R2 and earlier systems
PrivateBytes = (long)counters.PrivateUsage,
WorkingSetBytes = (long)counters.WorkingSetSize
});
}
finally
{
Kernel32.CloseHandle(handle);
}
}
private PERFORMANCE_INFORMATION GetPerformanceInformation()
{
if (!PsApi.GetPerformanceInfo(out var info))
{
Win32ExceptionUtility.Throw();
}
return(info);
}
public static ulong GetSystemTime()
{
if (Kernel32.GetSystemTimes(out var _, out var kernelTime, out var userTime))
{
return(kernelTime.ToULong() + userTime.ToULong());
}
Win32ExceptionUtility.Throw();
// unreachable
return(0);
}
public static ulong GetProcessTime(IntPtr hProcess)
{
if (Kernel32.GetProcessTimes(hProcess, out var _, out var _, out var kernelTime, out var userTime))
{
return(kernelTime.ToULong() + userTime.ToULong());
}
Win32ExceptionUtility.Throw();
// unreachable
return(0);
}
private static void EnsureProcessIsRunning(IntPtr handle, int pid)
{
if (!Kernel32.GetExitCodeProcess(handle, out var exitCode))
{
Win32ExceptionUtility.Throw();
}
if (exitCode != ProcessExitCodes.STILL_ALIVE)
{
ThrowOnProcessExit(pid);
}
}
private MEMORYSTATUSEX GetMemoryStatusEx()
{
var memoryStatusExSize = checked ((uint)Marshal.SizeOf(typeof(MEMORYSTATUSEX)));
var result = new MEMORYSTATUSEX
{
dwLength = memoryStatusExSize
};
if (!Kernel32.GlobalMemoryStatusEx(ref result))
{
Win32ExceptionUtility.Throw();
}
return(result);
}
/// <summary>
/// Estimates memory consumption
/// </summary>
/// <exception cref="InvalidOperationException">Process has exited</exception>
/// <returns></returns>
public ProcessMemoryInfo GetMemoryInfo()
{
ProcessUtility.EnsureProcessIsRunning(handle, pid);
if (!PsApi.GetProcessMemoryInfo(handle, out var counters))
{
Win32ExceptionUtility.Throw();
}
return(new ProcessMemoryInfo
{
// use PrivateUsage instead of PagefileUsage because PagefileUsage is always zero on Windows 7, Windows Server 2008 R2 and earlier systems
PrivateBytes = (long)counters.PrivateUsage,
WorkingSetBytes = (long)counters.WorkingSetSize,
});
}
