Github user paul-guo- commented on a diff in the pull request:
https://github.com/apache/incubator-hawq/pull/1243#discussion_r118220716
--- Diff: src/backend/executor/nodeMaterial.c ---
@@ -759,3 +764,30 @@ ExecEagerFreeMaterial(MaterialState *node)
}
}
+
+/*
+ * mkLockFileForWriter
+ *
+ * Create a unique lock file for writer. Then use flock's unblock way to
lock the lock file.
--- End diff --
use flock() to lock/unlock the lock file.
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