tsk_switch_handler

systime.c

void tsk_switch_handler()
{
    tm_current_slice--;                                                     //609
    if (tm_current_slice == 0)                                              //610
    {
        //Timeslice exhausted, switch to another thread as long as we can get access to the kernel critical section...
        if (kernel_critical_section)                                        //612, 613
        {
            //Thread is in kernel critical section, so we give the thread
            //some extra time to leave it. (We can't do anything until it
            //does.) (This usually means the thread is running execi.)
            tm_current_slice = 1;                                           //614-615
        }
        else
        {
            //Thread is ready to be switched!
            //sys_switch:                                                   //617
            tm_switcher_vector(); //This calls tm_switcher via function ptr.//618,619
        }
    }
    //Else, we don't do anything since the thread still has time to run.    //624, sys_noswitch
    return;
}