[Lldb-commits] [PATCH] D18912: sleep and retry on failure to delete temp file in tests

Adrian McCarthy via lldb-commits lldb-commits at lists.llvm.org
Mon Apr 11 08:26:38 PDT 2016

This revision was automatically updated to reflect the committed changes.
Closed by commit rL265948: Retry deletion of temporary files to avoid race conditions on Windows. (authored by amccarth).

Changed prior to commit:




Index: lldb/trunk/packages/Python/lldbsuite/test/lldbtest.py
--- lldb/trunk/packages/Python/lldbsuite/test/lldbtest.py
+++ lldb/trunk/packages/Python/lldbsuite/test/lldbtest.py
@@ -1049,23 +1049,13 @@
                         # it silently replaces the destination.  Ultimately this means that atomic renames are not
                         # guaranteed to be possible on Windows, but we need this to work anyway, so just remove the
                         # destination first if it already exists.
-                        os.remove(dst)
+                        remove_file(dst)
                     os.rename(src, dst)
             # success!  (and we don't want log files) delete log files
             for log_file in log_files_for_this_test:
-                try:
-                    os.unlink(log_file)
-                except:
-                    # We've seen consistent unlink failures on Windows, perhaps because the
-                    # just-created log file is being scanned by anti-virus.  Empirically, this
-                    # sleep-and-retry approach allows tests to succeed much more reliably.
-                    # Attempts to figure out exactly what process was still holding a file handle
-                    # have failed because running instrumentation like Process Monitor seems to
-                    # slow things down enough that the problem becomes much less consistent.
-                    time.sleep(0.5)
-                    os.unlink(log_file)
+                remove_file(log_file)
     # ====================================================
     # Config. methods supported through a plugin interface
@@ -1996,4 +1986,17 @@
     def RemoveTempFile(cls, file):
         if os.path.exists(file):
+            remove_file(file)
+# On Windows, the first attempt to delete a recently-touched file can fail
+# because of a race with antimalware scanners.  This function will detect a
+# failure and retry.
+def remove_file(file, num_retries = 1, sleep_duration = 0.5):
+    for i in range(num_retries+1):
+        try:
+            return True
+        except:
+            time.sleep(sleep_duration)
+            continue
+    return False

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