QueryProcessCycleTime function (realtimeapiset.h)

Retrieves the sum of the cycle time of all threads of the specified process.


BOOL QueryProcessCycleTime(
  [in]  HANDLE   ProcessHandle,
  [out] PULONG64 CycleTime


[in] ProcessHandle

A handle to the process. The handle must have the PROCESS_QUERY_INFORMATION or PROCESS_QUERY_LIMITED_INFORMATION access right. For more information, see Process Security and Access Rights.

[out] CycleTime

The number of CPU clock cycles used by the threads of the process. This value includes cycles spent in both user mode and kernel mode.

Return value

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.


To enumerate the processes in the system, use the EnumProcesses function.

To compile an application that uses this function, define _WIN32_WINNT as 0x0600 or later.


Requirement Value
Minimum supported client Windows Vista [desktop apps only]
Minimum supported server Windows Server 2008 [desktop apps only]
Target Platform Windows
Header realtimeapiset.h (include Windows.h on Windows 7, Windows Server 2008 Windows Server 2008 R2)
Library Kernel32.lib
DLL Kernel32.dll

See also