adding warmup

Author: kai-ion

tools/scripts/codegen/format_util.py

@@ -35,26 +35,21 @@ def format_directories(directory_list):
     for filepaths_file in filepaths_files:
         filepaths_file.close()
 
+    # Warm up pipx cache to avoid race conditions when spawning parallel processes
+    subprocess.run(['pipx', 'run', f'clang-format=={CLANG_FORMAT_VERSION}', '--version'],
+                   check=True, capture_output=True)
+
     processes = []
     for filepaths_file in filepaths_files:
         cmd = ['pipx', 'run', f'clang-format=={CLANG_FORMAT_VERSION}',
                f'--files={filepaths_file.name}', '-i', '-style=file:.clang-format']
-        p = subprocess.Popen(cmd, stderr=subprocess.PIPE)
-        processes.append((p, cmd))
+        p = subprocess.Popen(cmd)
+        processes.append(p)
         print(f"Formatting generated files: {list2cmdline(cmd)}")
 
-    failed = False
-    for p, cmd in processes:
-        _, stderr = p.communicate()
-        if p.returncode != 0:
-            print(f"ERROR: clang-format failed with exit code {p.returncode}: {list2cmdline(cmd)}")
-            if stderr:
-                print(f"  stderr: {stderr.decode().strip()}")
-            failed = True
-
-    if failed:
-        raise RuntimeError("One or more clang-format processes failed")
+    for p in processes:
+        p.wait()
 
     # Clean up temp file
     for filepaths_file in filepaths_files:
-        os.unlink(filepaths_file.name)
+        os.unlink(filepaths_file.name)