Set the QThreadPool stacksize to match python expectations.

Author: kristjanvalur

src/qasync/__init__.py

@@ -202,6 +202,19 @@ def __enter__(self, *args):
     def __exit__(self, *args):
         self.shutdown()
 
+    @staticmethod
+    def compute_stack_size():
+        # Match cpython/Python/thread_pthread.h
+        if sys.platform.startswith("darwin"):
+            stack_size = 16 * 2**20
+        elif sys.platform.startswith("freebsd"):
+            stack_size = 4 * 2**20
+        elif sys.platform.startswith("aix"):
+            stack_size = 2 * 2**20
+        else:
+            stack_size = None
+        return stack_size
+
 
 @with_logger
 class QThreadExecutor(QThreadExecutorBase):
@@ -222,13 +235,7 @@ def __init__(self, max_workers=10, stack_size=None):
         self.__max_workers = max_workers
         self.__queue = Queue()
         if stack_size is None:
-            # Match cpython/Python/thread_pthread.h
-            if sys.platform.startswith("darwin"):
-                stack_size = 16 * 2**20
-            elif sys.platform.startswith("freebsd"):
-                stack_size = 4 * 2**20
-            elif sys.platform.startswith("aix"):
-                stack_size = 2 * 2**20
+            stack_size = self.compute_stack_size()
         self.__workers = [
             _QThreadWorker(self.__queue, i + 1, stack_size) for i in range(max_workers)
         ]

tests/test_qthreadexec.py

@@ -46,6 +46,9 @@ def executor(request):
 def get_executor(request):
     if request.param is qasync.QThreadPoolExecutor:
         pool = qasync.QtCore.QThreadPool()
+        stack_size = qasync.QThreadExecutorBase.compute_stack_size()
+        if stack_size is not None:
+            pool.setStackSize(stack_size)
         pool.setMaxThreadCount(5)
         return request.param(pool)
     else: