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Created attachment 769 [details]
Doing "oProc.PriorityClass = System.Diagnostics.ProcessPriorityClass.Idle;" sometimes fails and sometimes works. A simple test program, which executes the "df" command multiple times, is attached.
Usually the command gets executed once and the program dies with
Unhandled Exception: System.ComponentModel.Win32Exception: Process not found
at System.Diagnostics.Process.set_PriorityClass (ProcessPriorityClass value) [0x00000] in <filename unknown>:0
at (wrapper remoting-invoke-with-check) System.Diagnostics.Process:set_PriorityClass (System.Diagnostics.ProcessPriorityClass)
at Example.Test.Main (System.String args) [0x00000] in <filename unknown>:0
But sometimes it runs through the whole loop without errors.
Tested on Linux using Mono JIT compiler version 2.11 (master/91eb198 Tue Oct 25 10:16:19 EEST 2011).
This is not a bug, MS.NET also throws an exception if the process has already exited:
System.InvalidOperationException: Cannot process request because the process (3380) has exited.
at System.Diagnostics.Process.GetProcessHandle(Int32 access, Boolean throwIfExited)
at System.Diagnostics.Process.set_PriorityClass(ProcessPriorityClass value)
at Example.Test.Main(String args)
Fixed mono to throw the same exception.