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#include <arch/types.h>
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#include <arch/types.h>
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#include <typedefs.h>
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#include <typedefs.h>
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#include <synch/mutex.h>
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#include <synch/mutex.h>
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#include <synch/synch.h>
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#include <synch/synch.h>
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#include <synch/spinlock.h>
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enum rwlock_type {
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enum rwlock_type {
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    RWLOCK_NONE,
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    RWLOCK_NONE,
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    RWLOCK_READER,
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    RWLOCK_READER,
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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_DECLARE(lock);
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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) \