upipe-pthread: add umutex_pthread_trylock#1167
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Allows the user to call pthread_mutex_trylock() on a umutex provided by this module. Lets the call return UBASE_ERR_BUSY if the mutex is already locked on another thread.
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Allows the user to call pthread_mutex_trylock() on a umutex provided by this module. Lets the call return UBASE_ERR_BUSY if the mutex is already locked on another thread.