Function sys_futex

components/lwp/lwp_futex.c:905–927

* @brief System call interface for futex operations * * @param[in] uaddr Pointer to the futex word in user space * @param[in] op Futex operation code * @param[in] val Operation-specific value * @param[in] timeout Pointer to timeout specification (can be NULL) * @param[in] uaddr2 Second futex word pointer for certain operations * @param[in] val3 Third operation-specific value * * @return S

 *        performing necessary access checks before delegating to the LWP futex handler.
 */
sysret_t sys_futex(int *uaddr, int op, int val, const struct timespec *timeout,
                   int *uaddr2, int val3)
{
    struct rt_lwp *lwp = RT_NULL;
    sysret_t ret = 0;

    if (!lwp_user_accessable(uaddr, sizeof(int)))
    {
        ret = -EFAULT;
    }
    else if (timeout && !_timeout_ignored(op) &&
             !lwp_user_accessable((void *)timeout, sizeof(struct timespec)))
    {
        ret = -EINVAL;
    }
    else
    {
        lwp = lwp_self();
        ret = lwp_futex(lwp, uaddr, op, val, timeout, uaddr2, val3);
    }

    return ret;
}

#define FUTEX_FLAGS (FUTEX_PRIVATE | FUTEX_CLOCK_REALTIME)
/**