tree 2d8b6caf1518410be6572f9c320bbe44fe23054b
parent 065c7baf158734a2466bc57caa34b29ee262f8a1
author Carl Shapiro <cshapiro@google.com> 1277767706 -0700
committer Carl Shapiro <cshapiro@google.com> 1277767706 -0700

Add a mode for concurrently marking and sweeping.

When enabled, the mutator threads will be resumed while tracing
proceeds from the roots.  After the trace completes the mutator
threads are suspended, the roots are remarked, and marked objects
are scanned for updates and re-marked.

There are two limitations to this implementation.  For the sake
of expediency, mutators are not permitted to allocate during the
concurrent marking phase.  This will be addressed in a subsequent
change.  As there is no write barrier, all objects, rather than
just those objects assigned to during the concurrent phase, are
scanned for updates.  This will be addressed after a write barrier
is implemented.

Change-Id: I82dba23b58a1cf985589ed21ec0cffb5ebf48aae