cross-platform worker estimation (#101)

sigmf/validate.py

@@ -121,10 +121,10 @@ def main(arg_tuple: Optional[Tuple[str, ...]] = None) -> None:
     n_total = len(paths)
     # estimate number of CPU cores
     # https://stackoverflow.com/questions/1006289/how-to-find-out-the-number-of-cpus-using-python
-    est_cpu_cores = len(os.sched_getaffinity(0))
+    est_num_workers = len(os.sched_getaffinity(0)) if os.name == 'posix' else os.cpu_count()
     # create a thread pool
     # https://docs.python.org/3.7/library/concurrent.futures.html#threadpoolexecutor
-    with ThreadPoolExecutor(max_workers=est_cpu_cores - 1) as executor:
+    with ThreadPoolExecutor(max_workers=est_num_workers) as executor:
         # submit jobs
         future_validations = {executor.submit(_validate_single_file, path, args.skip_checksum, log) for path in paths}
         # load and await jobs to complete... no return