Github user paul-guo- commented on a diff in the pull request:
https://github.com/apache/incubator-hawq/pull/1243#discussion_r119279170
--- Diff: src/backend/executor/nodeMaterial.c ---
@@ -759,3 +764,30 @@ ExecEagerFreeMaterial(MaterialState *node)
}
}
+
+/*
+ * mkLockFileForWriter
+ *
+ * Create a unique lock file for writer, then use flock() to lock/unlock
the lock file.
+ * We can make sure the lock file will be locked forerver until the writer
process quits.
+ */
+static void mkLockFileForWriter(int size, int share_id, char * name)
+{
+ char *lock_file;
+ int lock;
+
+ lock_file = (char *)palloc0(sizeof(char) * MAXPGPATH);
--- End diff --
MAXPGPATH -> size?
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