Add thread_pool_patterns

thread_pool_patterns/submit_wait_first.py

@@ -0,0 +1,22 @@
+#!/usr/bin/env python3
+from time import sleep
+from random import randint
+from concurrent.futures import ThreadPoolExecutor, Future, wait, FIRST_COMPLETED
+
+results: list[int] = []
+
+def add_one(number: int) -> int:
+    sleep(randint(0,2))
+    return number + 1
+
+
+def main() -> None:
+    executor = ThreadPoolExecutor(32)
+    futures: list[Future] = [executor.submit(add_one, number) for number in range(10)]
+    done, not_done = wait(futures, return_when=FIRST_COMPLETED)
+    executor.shutdown(wait=False, cancel_futures=True)
+    print(done.pop().result())
+
+
+if __name__ == "__main__":
+    main()