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} semaphore_t;
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} semaphore_t;
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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_FLAGS_NONE)
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    _semaphore_down_timeout((s), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE)
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#define semaphore_trydown(s) \
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#define semaphore_trydown(s) \
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    _semaphore_down_timeout((s), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NON_BLOCKING)   
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    _semaphore_down_timeout((s), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NON_BLOCKING)
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#define semaphore_down_timeout(s, usec) \
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#define semaphore_down_timeout(s, usec) \
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    _semaphore_down_timeout((s), (usec), SYNCH_FLAGS_NONE)
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    _semaphore_down_timeout((s), (usec), SYNCH_FLAGS_NONE)
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extern void semaphore_initialize(semaphore_t *s, int val);
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extern void semaphore_initialize(semaphore_t *s, int val);
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extern int _semaphore_down_timeout(semaphore_t *s, uint32_t usec, int flags);
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extern int _semaphore_down_timeout(semaphore_t *s, uint32_t usec, int flags);