Function _futex_get

components/lwp/lwp_futex.c:409–424

* @brief Get a futex (private or shared) for given user address * * @param[in] uaddr User-space address to lookup futex for * @param[in] lwp Pointer to lightweight process structure * @param[in] op_flags Operation flags (FUTEX_PRIVATE for private futex) * @param[out] rc Pointer to store result code (0 on success, error code on failure) * * @return Pointer to existing/new futex on success, N

 *       - _sftx_get for shared futexes (FUTEX_PRIVATE flag not set)
 */
static rt_futex_t _futex_get(void *uaddr, struct rt_lwp *lwp, int op_flags,
                             rt_err_t *rc)
{
    rt_futex_t futex = RT_NULL;

    if (op_flags & FUTEX_PRIVATE)
    {
        futex = _pftx_get(uaddr, lwp, op_flags, rc);
    }
    else
    {
        futex = _sftx_get(uaddr, lwp, op_flags, rc);
    }

    return futex;
}

/**
 * @brief Suspend a thread with timeout and add it to futex waiting list