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#include <synch/waitq.h>
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#include <synch/waitq.h>
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#include <synch/synch.h>
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#include <synch/synch.h>
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struct semaphore
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struct semaphore
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{
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{
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    waitq_t wq;
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    waitq_t wq;
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};
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};
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#define semaphore_down(s) \
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#define semaphore_down(s) \
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    _semaphore_down_timeout((s),SYNCH_NO_TIMEOUT,SYNCH_BLOCKING)
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    _semaphore_down_timeout((s),SYNCH_NO_TIMEOUT,SYNCH_BLOCKING)
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#define semaphore_trydown(s) \
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#define semaphore_trydown(s) \