p99_futex_add P99_FUTEX_COMPARE_EXCHANGE p99_futex_destroy p99_futex_exchange p99_futex_init p99_futex_load P99_FUTEX_MAX_WAITERS p99_futex_wait p99_futex_wakeup

p99_futex_add() unsigned p99_futex_add ( p99_futex volatile *  p00_fut, unsigned  p00_hmuch, unsigned  p00_cstart, unsigned  p00_clen, unsigned  p00_wmin, unsigned  p00_wmax  ) related increment the counter of p00_fut atomically by p00_hmuch. Returns the previous value of the counter After effecting the operation atomically, some waiters on this p99_futex will be woken up if the new value of the futex is in the range that is specified by the arguments p00_cstart and p00_clen. See P99_FUTEX_COMPARE_EXCHANGE for more details on the rules for the p00_wmin and p00_wmax counts. If p00_hmuch is 0, nothing is added so p99_futex_add is equivalent to p99_futex_load but with the additional effect that waiters might be woken up. Remarks to decrement the counter, just pass a negative argument to p00_hmuch. The modulo arithmetic for unsigned will do the rest for you. Waiters that wait for a value in the p00_clen element range starting at p00_cstart will be woken up if the counter reaches that value with this operation. p00_clen defaults to 1u p00_wmin defaults to 0u p00_wmax defaults to P99_FUTEX_MAX_WAITERS p99_futex_add is actually implemented as a macro that helps to provide default arguments to the real function. See also P99_CALL_DEFARG P99_DECLARE_DEFARG Referenced by p99_iterator::p99_iterator_signal().