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    mutex_t exclusive;  /**< Mutex for writers, readers can bypass it if readers_in is positive. */
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    mutex_t exclusive;  /**< Mutex for writers, readers can bypass it if readers_in is positive. */
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    count_t readers_in; /**< Number of readers in critical section. */
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    count_t readers_in; /**< Number of readers in critical section. */
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};
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};
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#define rwlock_write_lock(rwl) \
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#define rwlock_write_lock(rwl) \
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    _rwlock_write_lock_timeout((rwl),SYNCH_NO_TIMEOUT,SYNCH_BLOCKING)
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    _rwlock_write_lock_timeout((rwl),SYNCH_NO_TIMEOUT,SYNCH_FLAGS_NONE)
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#define rwlock_read_lock(rwl) \
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#define rwlock_read_lock(rwl) \
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    _rwlock_read_lock_timeout((rwl),SYNCH_NO_TIMEOUT,SYNCH_BLOCKING)
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    _rwlock_read_lock_timeout((rwl),SYNCH_NO_TIMEOUT,SYNCH_FLAGS_NONE)
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#define rwlock_write_trylock(rwl) \
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#define rwlock_write_trylock(rwl) \
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    _rwlock_write_lock_timeout((rwl),SYNCH_NO_TIMEOUT,SYNCH_NON_BLOCKING)
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    _rwlock_write_lock_timeout((rwl),SYNCH_NO_TIMEOUT,SYNCH_FLAGS_NON_BLOCKING)
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#define rwlock_read_trylock(rwl) \
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#define rwlock_read_trylock(rwl) \
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    _rwlock_read_lock_timeout((rwl),SYNCH_NO_TIMEOUT,SYNCH_NON_BLOCKING)
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    _rwlock_read_lock_timeout((rwl),SYNCH_NO_TIMEOUT,SYNCH_FLAGS_NON_BLOCKING)
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#define rwlock_write_lock_timeout(rwl,usec) \
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#define rwlock_write_lock_timeout(rwl,usec) \
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    _rwlock_write_lock_timeout((rwl),(usec),SYNCH_NON_BLOCKING)
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    _rwlock_write_lock_timeout((rwl),(usec),SYNCH_FLAGS_NONE)
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#define rwlock_read_lock_timeout(rwl,usec) \
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#define rwlock_read_lock_timeout(rwl,usec) \
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    _rwlock_read_lock_timeout((rwl),(usec),SYNCH_NON_BLOCKING)
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    _rwlock_read_lock_timeout((rwl),(usec),SYNCH_FLAGS_NONE)
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extern void rwlock_initialize(rwlock_t *rwl);
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extern void rwlock_initialize(rwlock_t *rwl);
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extern void rwlock_read_unlock(rwlock_t *rwl);
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extern void rwlock_read_unlock(rwlock_t *rwl);
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extern void rwlock_write_unlock(rwlock_t *rwl);
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extern void rwlock_write_unlock(rwlock_t *rwl);
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extern int _rwlock_read_lock_timeout(rwlock_t *rwl, __u32 usec, int trylock);
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extern int _rwlock_read_lock_timeout(rwlock_t *rwl, __u32 usec, int flags);
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extern int _rwlock_write_lock_timeout(rwlock_t *rwl, __u32 usec, int trylock);
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extern int _rwlock_write_lock_timeout(rwlock_t *rwl, __u32 usec, int flags);
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#endif
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#endif
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