Function _resr_cleanup

components/lwp/lwp_pid.c:2132–2229

* @brief Clean up resources when a lightweight process (LWP) terminates * * @param[in,out] lwp The lightweight process structure to clean up * * @note This function handles the cleanup of various resources associated with an LWP * when it terminates, including: * - Job control cleanup * - Signal detachment * - Child process handling * - Parent notification *

 *       - PID resource release
 */
static void _resr_cleanup(struct rt_lwp *lwp)
{
    int need_cleanup_pid = RT_FALSE;
    lwp_jobctrl_on_exit(lwp);

    LWP_LOCK(lwp);
    lwp_signal_detach(&lwp->signal);

    /**
     * @brief Detach children from lwp
     *
     * @note Critical Section
     * - the lwp (RW. Release lwp)
     * - the pid resource manager (RW. Release the pid)
     */
    while (lwp->first_child)
    {
        struct rt_lwp *child;

        child = lwp->first_child;
        lwp->first_child = child->sibling;

        /** @note safe since the slist node is release */
        LWP_UNLOCK(lwp);
        LWP_LOCK(child);
        if (child->terminated)
        {
            lwp_pid_put(child);
        }
        else
        {
            child->sibling = RT_NULL;
            /* info: this may cause an orphan lwp */
            child->parent = RT_NULL;
        }

        LWP_UNLOCK(child);
        lwp_ref_dec(child);
        lwp_ref_dec(lwp);

        LWP_LOCK(lwp);
    }
    LWP_UNLOCK(lwp);

    /**
     * @brief Wakeup parent if it's waiting for this lwp, otherwise a signal
     *        will be sent to parent
     *
     * @note Critical Section
     * - the parent lwp (RW.)
     */
    LWP_LOCK(lwp);
    if (lwp->parent &&
        !lwp_sigismember(&lwp->parent->signal.sig_action_nocldwait, SIGCHLD))
    {
        /* if successfully race to setup lwp->terminated before parent detach */
        LWP_UNLOCK(lwp);