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    RWLOCK_WRITER
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    RWLOCK_WRITER
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};
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};
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struct rwlock {
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struct rwlock {
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    spinlock_t lock;
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    spinlock_t lock;
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    mutex_t exclusive;
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    mutex_t exclusive;  /**< Mutex for writers, readers can bypass it if readers_in is positive. */
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    int readers_in;
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    int 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_BLOCKING)
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#define rwlock_read_lock(rwl) \
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#define rwlock_read_lock(rwl) \