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//----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//----------------------------------------------------------------------------
namespace System.ServiceModel.Activation
{
using System.ComponentModel;
using System.Runtime;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Security;
using System.ServiceModel.Channels;
using System.Threading;
static class ServiceMemoryGates
{
[Fx.Tag.SecurityNote(Critical = "Uses SecurityCritical helper methods to check memory status." +
"Allocates unmanaged resources, can only be called with admin-specified value.")]
[SecurityCritical]
internal static bool Check(int minFreeMemoryPercentage, bool throwOnLowMemory, out ulong availableMemoryBytes)
{
// Boundary check percentage, if out of bounds Gate is turned off.
// 0 is defined as disabled. Configuration defines 99 as max allowed so we disable
// if we receive something out of range
availableMemoryBytes = 0;
if (minFreeMemoryPercentage < 1 || minFreeMemoryPercentage > 99)
{
return true;
}
UnsafeNativeMethods.MEMORYSTATUSEX memoryStatus = new UnsafeNativeMethods.MEMORYSTATUSEX();
GetGlobalMemoryStatus(ref memoryStatus);
if (memoryStatus.ullAvailVirtual < (memoryStatus.ullTotalVirtual / 100 * (ulong)minFreeMemoryPercentage))
{
availableMemoryBytes = memoryStatus.ullAvailVirtual;
}
else if (memoryStatus.ullAvailPhys < (memoryStatus.ullTotalPhys / 100 * (ulong)minFreeMemoryPercentage))
{
availableMemoryBytes = memoryStatus.ullAvailPhys;
}
if (TD.ServiceActivationAvailableMemoryIsEnabled())
{
TD.ServiceActivationAvailableMemory(availableMemoryBytes);
}
if (availableMemoryBytes != 0)
{
if (throwOnLowMemory)
{
throw FxTrace.Exception.AsError(new InsufficientMemoryException(
SR.Hosting_MemoryGatesCheckFailed(availableMemoryBytes,
minFreeMemoryPercentage)));
}
else
{
return false;
}
}
return true;
}
[Fx.Tag.SecurityNote(Critical = "Uses UnsafeNativeMethods to fetch memory status structure, caller must not leak it.")]
[SecurityCritical]
static void GetGlobalMemoryStatus(ref UnsafeNativeMethods.MEMORYSTATUSEX memoryStatus)
{
memoryStatus.dwLength = (uint)Marshal.SizeOf(typeof(UnsafeNativeMethods.MEMORYSTATUSEX));
if (!UnsafeNativeMethods.GlobalMemoryStatusEx(ref memoryStatus))
{
int error = Marshal.GetLastWin32Error();
// Treat as the worst case.
throw FxTrace.Exception.AsError(
new InvalidOperationException(SR.Hosting_GetGlobalMemoryFailed, new Win32Exception(error)));
}
}
}
}
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