public unsafe void GetSetProcessInformationMemoryPriorityTest()
{
using var hProcess = Kernel32.GetCurrentProcess();
// Save current memory-priority info
MEMORY_PRIORITY_INFORMATION savedInfo;
Assert.True(Kernel32.GetProcessInformation(
hProcess,
PROCESS_INFORMATION_CLASS.ProcessMemoryPriority,
&savedInfo,
(uint)sizeof(MEMORY_PRIORITY_INFORMATION)));
// Set low memory priority on the process
var memoryPriority = new MEMORY_PRIORITY_INFORMATION
{
MemoryPriority = MemoryPriority.MEMORY_PRIORITY_LOW,
};
Assert.True(Kernel32.SetProcessInformation(
hProcess,
PROCESS_INFORMATION_CLASS.ProcessMemoryPriority,
&memoryPriority,
(uint)sizeof(MEMORY_PRIORITY_INFORMATION)));
// Now read it back and verify that we get back MEMORY_PRIORITY_LOW
memoryPriority.MemoryPriority = MemoryPriority.MEMORY_PRIORITY_NORMAL;
Assert.True(Kernel32.GetProcessInformation(
hProcess,
PROCESS_INFORMATION_CLASS.ProcessMemoryPriority,
&memoryPriority,
(uint)sizeof(MEMORY_PRIORITY_INFORMATION)));
Assert.Equal(
MemoryPriority.MEMORY_PRIORITY_LOW,
memoryPriority.MemoryPriority);
// Restore the saved memory-priority info
if (savedInfo.MemoryPriority != MemoryPriority.MEMORY_PRIORITY_LOW)
{
Assert.True(Kernel32.SetProcessInformation(
hProcess,
PROCESS_INFORMATION_CLASS.ProcessMemoryPriority,
&savedInfo,
(uint)sizeof(MEMORY_PRIORITY_INFORMATION)));
// Verify that the memory-priority was restore successfully
memoryPriority.MemoryPriority = MemoryPriority.MEMORY_PRIORITY_LOW;
Assert.True(Kernel32.GetProcessInformation(
hProcess,
PROCESS_INFORMATION_CLASS.ProcessMemoryPriority,
&memoryPriority,
(uint)sizeof(MEMORY_PRIORITY_INFORMATION)));
Assert.Equal(savedInfo.MemoryPriority, memoryPriority.MemoryPriority);
}
}
/// <summary>
/// http://msdn.microsoft.com/en-us/library/windows/desktop/hh448387(v=vs.85).aspx
/// </summary>
public static void SetMemoryPriority(ProcessMemoryPriority priority)
{
var priorityInfo = new MEMORY_PRIORITY_INFORMATION
{
MemoryPriority = (uint)priority
};
var priorityInfoLength = Marshal.SizeOf(priorityInfo);
var priorityInfoPointer = Marshal.AllocHGlobal(priorityInfoLength);
Marshal.StructureToPtr(priorityInfo, priorityInfoPointer, false);
NtSetInformationProcess(Process.GetCurrentProcess().Handle, PROCESS_INFORMATION_CLASS.ProcessMemoryPriority, priorityInfoPointer, (uint)priorityInfoLength);
}
