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SPINLOCK_INITIALIZE(lock);
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SPINLOCK_INITIALIZE(lock);
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static waitq_t can_start;
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static waitq_t can_start;
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__u32 seed = 0xdeadbeef;
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uint32_t seed = 0xdeadbeef;
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static __u32 random(__u32 max);
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static uint32_t random(uint32_t max);
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static void writer(void *arg);
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static void writer(void *arg);
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static void reader(void *arg);
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static void reader(void *arg);
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static void failed(void);
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static void failed(void);
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__u32 random(__u32 max)
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uint32_t random(uint32_t max)
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{
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{
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    __u32 rc;
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    uint32_t rc;
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    spinlock_lock(&lock);  
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    spinlock_lock(&lock);  
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    rc = seed % max;
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    rc = seed % max;
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    seed = (((seed<<2) ^ (seed>>2)) * 487) + rc;
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    seed = (((seed<<2) ^ (seed>>2)) * 487) + rc;
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    spinlock_unlock(&lock);
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    spinlock_unlock(&lock);
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}
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}
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void test(void)
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void test(void)
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{
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{
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    context_t ctx;
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    context_t ctx;
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    __u32 i, k;
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    uint32_t i, k;
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    printf("Read/write locks test #4\n");
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    printf("Read/write locks test #4\n");
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    waitq_initialize(&can_start);
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    waitq_initialize(&can_start);
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    rwlock_initialize(&rwlock);
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    rwlock_initialize(&rwlock);