public static ThreadPriority GetCurrentThreadPriority()
{
if (PlatformDetails.RunningOnPosix)
{
var threadId = Syscall.gettid();
var value = Syscall.getpriority((int)Prio.PROCESS, threadId);
// we assume no failure here, since clearing errno isn't really possible here
return(FixLinuxPriority(value));
}
IntPtr handle = IntPtr.Zero;
try
{
uint threadId = Win32ThreadsMethods.GetCurrentThreadId();
handle = Win32ThreadsMethods.OpenThread(ThreadAccess.QueryInformation, false, threadId);
if (handle == IntPtr.Zero)
{
throw new Win32Exception("Failed to setup thread priority, couldn't open the current thread");
}
return(Win32ThreadsMethods.GetThreadPriority(handle));
}
finally
{
if (handle != IntPtr.Zero)
{
Win32ThreadsMethods.CloseHandle(handle);
}
}
}
public static unsafe void SetCurrentThreadPriority(ThreadPriority priority)
{
if (PlatformDetails.RunningOnPosix)
{
var nice = FixLinuxPriority(priority);
var threadId = Syscall.gettid();
var success = Syscall.setpriority((int)Prio.PROCESS, threadId, nice);
if (success != 0)
{
int lastError = Marshal.GetLastWin32Error();
if (_log.IsInfoEnabled)
{
_log.Info($"SetThreadPriority failed to set thread priority. threadId:{threadId}, error code {lastError} - {(Errno)lastError}");
}
throw new InvalidOperationException("Failed to set priority to thread " + threadId + " with " + (Errno)lastError);
}
}
else
{
IntPtr handle = IntPtr.Zero;
try
{
uint threadId = Win32ThreadsMethods.GetCurrentThreadId();
handle = Win32ThreadsMethods.OpenThread(ThreadAccess.SetInformation, false, threadId);
if (handle == IntPtr.Zero)
{
throw new Win32Exception("Failed to setup thread priority, couldn't open the current thread");
}
var success = Win32ThreadsMethods.SetThreadPriority(handle, (int)priority);
if (success == 0)
{
int lastWin32ErrorCode = Marshal.GetLastWin32Error();
if (_log.IsInfoEnabled)
{
_log.Info($"SetThreadPriority failed to set thread priority. threadId:{threadId}, error code {lastWin32ErrorCode}");
}
throw new Win32Exception(lastWin32ErrorCode, "Failed to set priority to thread " + threadId);
}
}
finally
{
Win32ThreadsMethods.CloseHandle(handle);
}
}
}