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_exchange() unsigned p99_futex_exchange ( p99_futex volatile *  p00_fut, unsigned  p00_desired, unsigned  p00_cstart, unsigned  p00_clen, unsigned  p00_wmin, unsigned  p00_wmax  ) related Unconditionally and atomically set the futex p00_fut to value p00_desired. 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. Also signals eventual waiters if the futex falls within the given range. Returns the previous value of the futex Remarks 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. This signaling of waiters might not be performed if the counter reached p00_cstart because it wrapped around. p00_clen defaults to 1u p00_wmin defaults to 0u p00_wmax defaults to P99_FUTEX_MAX_WAITERS p99_futex_exchange 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_cm::p99_cm_trylock().