[lit] Try to exit more cleanly

If all jobs complete successfully, use pool.close() instead of
pool.terminate() before waiting for the workers. Zach Turner reported
that he was getting "access denied" exceptions from pool.terminate().

Make the workers abort immediately without printing to stderr when they
are interrupted.

Finally, catch exceptions when attempting to remove our temporary
testing directory. On abnormal exit, there can often be open handles
that haven't been cleaned up yet.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301941 91177308-0d34-0410-b5e6-96231b3b80d8

utils/lit/lit/main.py

@@ -161,7 +161,11 @@ def main(builtinParameters = {}):
         main_with_tmp(builtinParameters)
     finally:
         if lit_tmp:
-            shutil.rmtree(lit_tmp)
+            try:
+                shutil.rmtree(lit_tmp)
+            except:
+                # FIXME: Re-try after timeout on Windows.
+                pass
 
 def main_with_tmp(builtinParameters):
     parser = argparse.ArgumentParser()

utils/lit/lit/run.py

@@ -20,6 +20,14 @@ except ImportError:
 
 import lit.Test
 
+def abort_now():
+    """Abort the current process without doing any exception teardown"""
+    sys.stdout.flush()
+    if win32api:
+        win32api.TerminateProcess(win32api.GetCurrentProcess(), 3)
+    else:
+        os.kill(0, 9)
+
 ###
 # Test Execution Implementation
 
@@ -91,8 +99,7 @@ class Tester(object):
             # This is a sad hack. Unfortunately subprocess goes
             # bonkers with ctrl-c and we start forking merrily.
             print('\nCtrl-C detected, goodbye.')
-            sys.stdout.flush()
-            os.kill(0,9)
+            abort_now()
         self.consumer.update(test_index, test)
 
 class ThreadResultsConsumer(object):
@@ -353,7 +360,7 @@ class Run(object):
                 print('\nCtrl-C detected, terminating.')
                 pool.terminate()
                 pool.join()
-                os.kill(0,9)
+                abort_now()
                 return True
             win32api.SetConsoleCtrlHandler(console_ctrl_handler, True)
 
@@ -368,6 +375,10 @@ class Run(object):
             deadline = time.time() + max_time
 
         # Start a process pool. Copy over the data shared between all test runs.
+        # FIXME: Find a way to capture the worker process stderr. If the user
+        # interrupts the workers before we make it into our task callback, they
+        # will each raise a KeyboardInterrupt exception and print to stderr at
+        # the same time.
         pool = multiprocessing.Pool(jobs, worker_initializer,
                                     (self.lit_config,
                                      self.parallelism_semaphores))
@@ -379,6 +390,7 @@ class Run(object):
                                               args=(test_index, test),
                                               callback=self.consume_test_result)
                              for test_index, test in enumerate(self.tests)]
+            pool.close()
 
             # Wait for all results to come in. The callback that runs in the
             # parent process will update the display.
@@ -395,10 +407,12 @@ class Run(object):
                     a.get() # Exceptions raised here come from the worker.
                 if self.hit_max_failures:
                     break
-        finally:
+        except:
             # Stop the workers and wait for any straggling results to come in
             # if we exited without waiting on every async result.
             pool.terminate()
+            raise
+        finally:
             pool.join()
 
         # Mark any tests that weren't run as UNRESOLVED.
@@ -463,11 +477,7 @@ def worker_run_one_test(test_index, test):
         execute_test(test, child_lit_config, child_parallelism_semaphores)
         return (test_index, test)
     except KeyboardInterrupt as e:
-        # This is a sad hack. Unfortunately subprocess goes
-        # bonkers with ctrl-c and we start forking merrily.
-        print('\nCtrl-C detected, goodbye.')
-        traceback.print_exc()
-        sys.stdout.flush()
-        os.kill(0,9)
+        # If a worker process gets an interrupt, abort it immediately.
+        abort_now()
     except:
         traceback.print_exc()