etcd-sim: fix stdio-buffering problem

Leader election was not working because processes were continuing to
read their own cached copies of the data file contents, not seeing each
others' changes.  Fflush is not sufficient to ensure that data
propagates from one process to another.  Even ensuring that it gets to
disk requires an fsync as well (which we weren't doing).  The only
viable solution is to *reopen* the data file with an empty buffer.  This
also makes it easier to ensure correct locking across the whole file,
instead of just from the previous seek position to EOF.

Change-Id: I165d55afd5804dc3f579ea7e55c56da5066ae6c1
Signed-off-by: Jeff Darcy <jdarcy@redhat.com>

0 files changed, 0 insertions, 0 deletions