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Test pg_atomic_fetch_add_ with variable addend and 16-bit edge cases.
Back-patch to 9.5, which introduced these functions. Reviewed by Tom Lane. Discussion: https://postgr.es/m/20190831071157.GA3251746@rfd.leadboat.com
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@ -679,7 +679,7 @@ test_atomic_uint32(void)
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if (pg_atomic_read_u32(&var) != 3)
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elog(ERROR, "atomic_read_u32() #2 wrong");
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if (pg_atomic_fetch_add_u32(&var, 1) != 3)
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if (pg_atomic_fetch_add_u32(&var, pg_atomic_read_u32(&var) - 2) != 3)
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elog(ERROR, "atomic_fetch_add_u32() #1 wrong");
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if (pg_atomic_fetch_sub_u32(&var, 1) != 4)
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@ -704,6 +704,20 @@ test_atomic_uint32(void)
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if (pg_atomic_fetch_add_u32(&var, INT_MAX) != INT_MAX)
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elog(ERROR, "pg_atomic_add_fetch_u32() #3 wrong");
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pg_atomic_fetch_add_u32(&var, 2); /* wrap to 0 */
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if (pg_atomic_fetch_add_u32(&var, PG_INT16_MAX) != 0)
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elog(ERROR, "pg_atomic_fetch_add_u32() #3 wrong");
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if (pg_atomic_fetch_add_u32(&var, PG_INT16_MAX + 1) != PG_INT16_MAX)
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elog(ERROR, "pg_atomic_fetch_add_u32() #4 wrong");
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if (pg_atomic_fetch_add_u32(&var, PG_INT16_MIN) != 2 * PG_INT16_MAX + 1)
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elog(ERROR, "pg_atomic_fetch_add_u32() #5 wrong");
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if (pg_atomic_fetch_add_u32(&var, PG_INT16_MIN - 1) != PG_INT16_MAX)
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elog(ERROR, "pg_atomic_fetch_add_u32() #6 wrong");
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pg_atomic_fetch_add_u32(&var, 1); /* top up to UINT_MAX */
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if (pg_atomic_read_u32(&var) != UINT_MAX)
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@ -779,7 +793,7 @@ test_atomic_uint64(void)
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if (pg_atomic_read_u64(&var) != 3)
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elog(ERROR, "atomic_read_u64() #2 wrong");
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if (pg_atomic_fetch_add_u64(&var, 1) != 3)
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if (pg_atomic_fetch_add_u64(&var, pg_atomic_read_u64(&var) - 2) != 3)
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elog(ERROR, "atomic_fetch_add_u64() #1 wrong");
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if (pg_atomic_fetch_sub_u64(&var, 1) != 4)
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