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    /**
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    /**
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     * Mutex for writers, readers can bypass it if readers_in is positive.
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     * Mutex for writers, readers can bypass it if readers_in is positive.
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     */
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     */
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    mutex_t exclusive;
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    mutex_t exclusive;
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    /** Number of readers in critical section. */
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    /** Number of readers in critical section. */
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    count_t readers_in;
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    size_t readers_in;
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} rwlock_t;
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} rwlock_t;
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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_FLAGS_NONE)
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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) \