CODEWITHSUNDEEP
c#memory-managementout-of-memory
Lydon Ch
Lydon Ch

Reputation: 8815

windows c# low memory notification

How do I subscribe to Windows Low memory notification from c# ?

our c# app has substantial unmanaged memory allocation, which we can free if OS memory availability is low.

Upvotes: 1

Views: 585

Answers (1)

Lydon Ch
Lydon Ch

Reputation: 8815

Using CreateMemoryResourceNotification and QueryMemoryResourceNotification to check memory status

    enum MemoryResourceNotificationType : int
    {
        LowMemoryResourceNotification = 0,
        HighMemoryResourceNotification = 1,
    }

    [DllImport("kernel32.dll", SetLastError = true)]
    static extern IntPtr CreateMemoryResourceNotification(MemoryResourceNotificationType notificationType);

    [DllImport("kernel32.dll", SetLastError = true)]
    internal static extern bool QueryMemoryResourceNotification(IntPtr resourceNotificationHandle, out int resourceState);

    private static IntPtr MemoryResourceNotificationHandle;

    public static void TryReclaim()
    {
        MemoryResourceNotificationHandle = CreateMemoryResourceNotification(MemoryResourceNotificationType.LowMemoryResourceNotification);

        int sleepIntervalInMs = ReclaimIntervalInSeconds * 1000;

        while (true)
        {
            Thread.Sleep(10_000);

            bool isSuccecced = QueryMemoryResourceNotification(MemoryResourceNotificationHandle, out int memoryStatus);

            if (isSuccecced)
            {
                if (memoryStatus >= 1)
                {
                   DoReclaim();
                }

            }

        }           


    }

Upvotes: 2

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