GetSystemCpuSetInformation function (processthreadsapi.h)

Allows an application to query the available CPU Sets on the system, and their current state.

Syntax

BOOL GetSystemCpuSetInformation(
  PSYSTEM_CPU_SET_INFORMATION Information,
  ULONG                       BufferLength,
  PULONG                      ReturnedLength,
  HANDLE                      Process,
  ULONG                       Flags
);

Parameters

Information

A pointer to a SYSTEM_CPU_SET_INFORMATION structure that receives the CPU Set data. Pass NULL with a buffer length of 0 to determine the required buffer size.

BufferLength

The length, in bytes, of the output buffer passed as the Information argument.

ReturnedLength

The length, in bytes, of the valid data in the output buffer if the buffer is large enough, or the required size of the output buffer. If no CPU Sets exist, this value will be 0.

Process

An optional handle to a process. This process is used to determine the value of the AllocatedToTargetProcess flag in the SYSTEM_CPU_SET_INFORMATION structure. If a CPU Set is allocated to the specified process, the flag is set. Otherwise, it is clear. This handle must have the PROCESS_QUERY_LIMITED_INFORMATION access right. The value returned by GetCurrentProcess may also be specified here.

Flags

Reserved, must be 0.

Return value

If the API succeeds it returns TRUE. If it fails, the error reason is available through GetLastError. If the Information buffer was NULL or not large enough, the error code ERROR_INSUFFICIENT_BUFFER is returned. This API cannot fail when passed valid parameters and a buffer that is large enough to hold all of the return data.

Requirements