Mike Gelfand
0425866486
Allow for process termination when polling with isRunning ...
On *NIX, one needs to call `waitpid()` in order for process to exit the
zombie state. If one uses `Process::isRunning()` to emulate non-blocking
wait for child process termination, process will stay zombie and function
will always return true.
This commit changes `Process::isRunning()` to call `waitpid()` with
`WNOHANG` instead of using `kill()` when checking for child process (i.e.
the one we have ProcessHandle for), which allows for process termination.
Additional trickery with mutex and event is needed to prevent exceptions
when `Process::isRunning()` and/or `Process::wait()` is called concurrently
on the same handle from different threads.
Fixes #1097 .
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0425866486