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# Tests for locking conflicts with TRUNCATE commands.
setup
{
CREATE ROLE regress_truncate_conflict;
CREATE TABLE truncate_tab (a int);
}
teardown
{
DROP TABLE truncate_tab;
DROP ROLE regress_truncate_conflict;
}
session "s1"
step "s1_begin" { BEGIN; }
step "s1_tab_lookup" { SELECT count(*) >= 0 FROM truncate_tab; }
step "s1_commit" { COMMIT; }
session "s2"
step "s2_grant" { GRANT TRUNCATE ON truncate_tab TO regress_truncate_conflict; }
step "s2_auth" { SET ROLE regress_truncate_conflict; }
step "s2_truncate" { TRUNCATE truncate_tab; }
step "s2_reset" { RESET ROLE; }
# The role doesn't have privileges to truncate the table, so TRUNCATE should
# immediately fail without waiting for a lock.
permutation "s1_begin" "s1_tab_lookup" "s2_auth" "s2_truncate" "s1_commit" "s2_reset"
permutation "s1_begin" "s2_auth" "s2_truncate" "s1_tab_lookup" "s1_commit" "s2_reset"
permutation "s1_begin" "s2_auth" "s1_tab_lookup" "s2_truncate" "s1_commit" "s2_reset"
permutation "s2_auth" "s2_truncate" "s1_begin" "s1_tab_lookup" "s1_commit" "s2_reset"
# The role has privileges to truncate the table, TRUNCATE will block if
# another session holds a lock on the table and succeed in all cases.
permutation "s1_begin" "s1_tab_lookup" "s2_grant" "s2_auth" "s2_truncate" "s1_commit" "s2_reset"
permutation "s1_begin" "s2_grant" "s2_auth" "s2_truncate" "s1_tab_lookup" "s1_commit" "s2_reset"
permutation "s1_begin" "s2_grant" "s2_auth" "s1_tab_lookup" "s2_truncate" "s1_commit" "s2_reset"
permutation "s2_grant" "s2_auth" "s2_truncate" "s1_begin" "s1_tab_lookup" "s1_commit" "s2_reset"
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