cache: sync the cache file to disk in the background

This version uses a thread rather than a process, to avoid problems with
waitpid handling.  This gives slightly less overall build time reduction than
the separate process for it did (this reduces a -c compile coreutils-native by
about 3 seconds, while the process reduced it by 7 seconds), however this time
is quite insignificant relative to a typical build.

The biggest issue with non-backgrounded syncing is the perceived delay before
work begins, and this resolves that without breaking anything, or so it seems.

(Bitbake rev: 5ab6c5c7b007b8c77c751582141afc07c183d672)

Signed-off-by: Chris Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

1 files changed, 16 insertions, 4 deletions

diff --git a/bitbake/lib/bb/event.py b/bitbake/lib/bb/event.py
index 5f292bccbc..5b0a183acd 100644
--- a/bitbake/lib/bb/event.py
+++ b/bitbake/lib/bb/event.py
@@ -296,10 +296,16 @@ class MultipleProviders(Event):
         """
         return self._candidates
 
-class ParseProgress(Event):
-    """
-    Parsing Progress Event
-    """
+class ParseStarted(Event):
+    """Recipe parsing for the runqueue has begun"""
+    def __init__(self, total, skipped, masked):
+        Event.__init__(self)
+        self.total = total
+        self.skipped = skipped
+        self.masked = masked
+
+class ParseCompleted(Event):
+    """Recipe parsing for the runqueue has completed"""
 
     def __init__(self, cached, parsed, skipped, masked, virtuals, errors, total):
         Event.__init__(self)
@@ -312,6 +318,12 @@ class ParseProgress(Event):
         self.sofar = cached + parsed
         self.total = total
 
+class ParseProgress(Event):
+    """Recipe parsing progress"""
+
+    def __init__(self, current):
+        self.current = current
+
 class DepTreeGenerated(Event):
     """
     Event when a dependency tree has been generated