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When we kill a child we send SIGSTOP first so that we can traverse its child processes recursively. On unwinding the recursion we then send SIGKILL. Current Cygwin has trouble when both signals are sent in quick succession by the parent process. Add a usleep(1) after sending the first signal to give up our time slice and give Cygwin a chance to process the first signal before sending the second.
KWSys provides a platform-independent API to many common system features that are implemented differently on every platform. This library is intended to be shared among many projects, so it has a configurable namespace. Each project should configure KWSys to use a namespace unique to itself. See comments in CMakeLists.txt for details. You are probably reading this file in the source tree of a surrounding project. In that case, see "../README.kwsys" for details of using KWSys in your project.