Support mono about netmq HOT 2 CLOSED

I just ran the Mono Migration Analyzer (MoMA) and it reported only 4 issues:

• Calling Method: void TuneTcpKeepalives (Socket, int, int, int, int)
  • Method that Throws NotImplementedException: int Socket.IOControl (IOControlCode, Byte[], Byte[])
• Calling Method: void TuneTcpKeepalives (Socket, int, int, int, int)
  • Method with [MonoTodo] Reason: int Socket.IOControl (IOControlCode, Byte[], Byte[])
• Calling Method: void Open ()
  • P/Invoke Method P/Invoke Library: IntPtr Opcode/NativeMethods.VirtualAlloc (IntPtr, UIntPtr, Opcode/AllocationType, Opcode/MemoryProtection) kernel32.dll
• Calling Method: void Close ()
  • P/Invoke Method P/Invoke Library: bool Opcode/NativeMethods.VirtualFree (IntPtr, UIntPtr, Opcode/FreeType) kernel32.dll

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Actually the TCP Keep Alive is not much of an issue, because this feature is not supported by Mono, therefore if somebody develop for Mono they should not use this feature.

Regarding the VirtualAlloc and VirtualFree, the issue is that zeromq is using something called RDTSC (some kind of timestamp) to decide if need to handle commands or no, the idea is that you only want to handle command once every X microseconds, calling the RDTSC is very cheap in performance while using other methods can cost more.

In order to call RDTSC you need to use assembly, this is way the VirtualAlloc and VirtualFree are used. Also if the platform is not windows RDTSC is not used and instead Stopwatch.GetTimestamp is used.

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