[pgpool-committers: 878] pgpool: Add interlocking mechanism of exclusive failover command execut

[Yugo Nagata]

Add interlocking mechanism of exclusive failover command execution

When using multiple pgpools with watchdog enabled, failover commands
(failover_command, failback_command, and follow_master_comman) get
executed only at one pgpool.

Previously, these command got executed at all pgpools.

Branch
------
feature/watchdog_for_v3_3

Details
-------
http://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=bcc2e9fd84fc4990ae701821340739d54ac0b150

Modified Files
--------------
watchdog/wd_interlock.c |  217 +++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 217 insertions(+), 0 deletions(-)