[Insight-developers] Using kwsys/Process.h functions

[kent williams]

I just wrote some code to do coarse-grained parallelism using the
kwsysProcess functions.  I run two external programs at the same time on a
multiprocessor.

It worked as advertised except for one thing: If I ran a process
synchronously -- i.e. I didn't set kwsysProcess_Option_Detach -- and then
called kwsysProcess_GetExitValue, the exit code returned was always 1, even
if the program successfully executed.

If I ran the program detached, the correct exit code was returned.

My work around was to run all processes detached, but call
kwsysProcess_GetExitValue to block and wait for the process synchronously if
needed.

Since kwsysProcess is used in Cmake, I assume it has been thoroughly tested,
and I'm just missing something. Am I?