/* LOCK COMPATIBILITY MATRIX

 *     IS    IX    S    X     AI

 * IS  +     +     +    -     +

 * IX  +     +     -    -     +

 * S   +     -     +    -     -

 * X   -     -     -    -     -

 * AI  +     +     -    -     -

 *

 * Note that for rows, InnoDB only acquires S or X locks.

 * For tables, InnoDB normally acquires IS or IX locks.

 * S or X table locks are only acquired for LOCK TABLES.

 * Auto-increment (AI) locks are needed because of

 * statement-level MySQL binlog.

 * See also lock_mode_compatible().

 */

/*********************************************************************//**

Calculates if lock mode 1 is compatible with lock mode 2.

@return    nonzero if mode1 compatible with mode2 */

UNIV_INLINE

ulint

lock_mode_compatible(

/*=================*/

    enum lock_mode    mode1,    /*!< in: lock mode */

    enum lock_mode    mode2)    /*!< in: lock mode */

{

    ut_ad(mode1 == LOCK_X || mode1 == LOCK_S || mode1 == LOCK_IX

          || mode1 == LOCK_IS || mode1 == LOCK_AUTO_INC);

    ut_ad(mode2 == LOCK_X || mode2 == LOCK_S || mode2 == LOCK_IX

          || mode2 == LOCK_IS || mode2 == LOCK_AUTO_INC);

    return((LOCK_MODE_COMPATIBILITY) & LK(mode1, mode2));

}