gh-109649: Use os.process_cpu_count() (#110165)

Replace os.cpu_count() with os.process_cpu_count() in modules:

* compileall
* concurrent.futures
* multiprocessing

Replace os.cpu_count() with os.process_cpu_count() in programs:

* _decimal deccheck.py test
* freeze.py
* multissltests.py
* python -m test (regrtest)
* wasm_build.py

Other changes:

* test.pythoninfo logs os.process_cpu_count().
* regrtest gets os.process_cpu_count() / os.cpu_count() in headers.

2 files changed, 3 insertions, 3 deletions

diff --git a/Lib/concurrent/futures/process.py b/Lib/concurrent/futures/process.py
index 3990e6b..ffaffdb 100644
--- a/Lib/concurrent/futures/process.py
+++ b/Lib/concurrent/futures/process.py
@@ -666,7 +666,7 @@ class ProcessPoolExecutor(_base.Executor):
         _check_system_limits()
 
         if max_workers is None:
-            self._max_workers = os.cpu_count() or 1
+            self._max_workers = os.process_cpu_count() or 1
             if sys.platform == 'win32':
                 self._max_workers = min(_MAX_WINDOWS_WORKERS,
                                         self._max_workers)
diff --git a/Lib/concurrent/futures/thread.py b/Lib/concurrent/futures/thread.py
index 3b3a36a..a024033 100644
--- a/Lib/concurrent/futures/thread.py
+++ b/Lib/concurrent/futures/thread.py
@@ -139,10 +139,10 @@ class ThreadPoolExecutor(_base.Executor):
             # * CPU bound task which releases GIL
             # * I/O bound task (which releases GIL, of course)
             #
-            # We use cpu_count + 4 for both types of tasks.
+            # We use process_cpu_count + 4 for both types of tasks.
             # But we limit it to 32 to avoid consuming surprisingly large resource
             # on many core machine.
-            max_workers = min(32, (os.cpu_count() or 1) + 4)
+            max_workers = min(32, (os.process_cpu_count() or 1) + 4)
         if max_workers <= 0:
             raise ValueError("max_workers must be greater than 0")