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Added ARM archictecture detection to avoid the native call error when RDTSC used #227

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Feb 9, 2015
Merged

Added ARM archictecture detection to avoid the native call error when RDTSC used #227

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35 changes: 35 additions & 0 deletions src/NetMQ/zmq/Utils/OpCode.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ public static class Opcode

private static IntPtr codeBuffer;
private static ulong size;
private static bool isArm;

public static void Open()
{
Expand All @@ -29,6 +30,12 @@ public static void Open()

if ((p == 4) || (p == 128))
{ // Unix
isArm = IsARMArchitecture();
if (isArm)
{
Rdtsc = RdtscOnArm;
return;
}
Assembly assembly =
Assembly.Load("Mono.Posix");

Expand Down Expand Up @@ -67,6 +74,29 @@ public static void Open()
codeBuffer, typeof(RdtscDelegate)) as RdtscDelegate;
}

private static bool IsARMArchitecture()
{
bool result = false;
//force to load from mono gac
Assembly currentAssembly = Assembly.Load("Mono.Posix, Version=2.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756");
Type syscall = currentAssembly.GetType("Mono.Unix.Native.Syscall");
Type utsname = currentAssembly.GetType("Mono.Unix.Native.Utsname");
MethodInfo uname = syscall.GetMethod("uname");
object[] parameters = new object[] { null };

int invokeResult = (int)uname.Invoke(null, parameters);
if (invokeResult == 0)
{
if (parameters != null)
{
object currentValues = parameters[0];
string machineValue = (string)utsname.GetField("machine").GetValue(currentValues);
result = machineValue.ToLower().Contains("arm");
}
}
return result;
}

public static void Close()
{
Rdtsc = null;
Expand All @@ -90,6 +120,11 @@ public static void Close()
}
}

private static ulong RdtscOnArm()
{
return (ulong)Environment.TickCount;
}

[UnmanagedFunctionPointer(CallingConvention.StdCall)]
public delegate ulong RdtscDelegate();

Expand Down