From 321e1921ca02a3dc3507eb095efd38efe6c79ba9 Mon Sep 17 00:00:00 2001
From: Ned Batchelder <ned@nedbatchelder.com>
Date: Fri, 23 Sep 2016 07:52:32 -0400
Subject: Add more debugging for thorny multiprocessing issues

---
 coverage/multiproc.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'coverage/multiproc.py')

diff --git a/coverage/multiproc.py b/coverage/multiproc.py
index 78c680c7..fe837318 100644
--- a/coverage/multiproc.py
+++ b/coverage/multiproc.py
@@ -34,12 +34,18 @@ class ProcessWithCoverage(OriginalProcess):
         rcfile = os.environ[COVERAGE_RCFILE_ENV]
         cov = Coverage(data_suffix=True, config_file=rcfile)
         cov.start()
+        debug = cov.debug
         try:
+            if debug.should("multiproc"):
+                debug.write("Calling multiprocessing bootstrap")
             return original_bootstrap(self)
         finally:
+            if debug.should("multiproc"):
+                debug.write("Finished multiprocessing bootstrap")
             cov.stop()
             cov.save()
-
+            if debug.should("multiproc"):
+                debug.write("Saved multiprocessing data")
 
 class Stowaway(object):
     """An object to pickle, so when it is unpickled, it can apply the monkey-patch."""
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