/*
 * Copyright 2008, Michael Lotz, mmlr@mlotz.ch
 * Distributed under the terms of the MIT License.
 */


#include <debug.h>

#include <signal.h>

#include <kscheduler.h>
#include <smp.h>


static sem_id sRequestSem = -1;


static int32
invalidate_loop(void *data)
{
        while (true) {
                if (acquire_sem(sRequestSem) != B_OK)
                        break;

                uint32 message[3];
                message[0] = sizeof(message);   // size
                message[1] = 'KDLE';                    // message code
                message[2] = 0;                                 // flags

                // where "d:0:baron' stands for desktop x of user y which both
                // currently are hardcoded and where '_PTL' is the port link code
                write_port(find_port("d:0:baron"), '_PTL', &message, sizeof(message));
        }

        return 0;
}


static void
exit_debugger()
{
        release_sem_etc(sRequestSem, 1, B_DO_NOT_RESCHEDULE);
}


static status_t
std_ops(int32 op, ...)
{
        if (op == B_MODULE_INIT) {
                sRequestSem = create_sem(0, "invalidate_loop_request");
                if (sRequestSem < B_OK)
                        return sRequestSem;

                thread_id thread = spawn_kernel_thread(&invalidate_loop,
                        "invalidate_loop", B_NORMAL_PRIORITY, NULL);
                if (thread < B_OK)
                        return thread;

                resume_thread(thread);
                return B_OK;
        } else if (op == B_MODULE_UNINIT) {
                // deleting the sem will also cause the thread to exit
                delete_sem(sRequestSem);
                sRequestSem = -1;
                return B_OK;
        }

        return B_BAD_VALUE;
}


static struct debugger_module_info sModuleInfo = {
        {
                "debugger/invalidate_on_exit/v1",
                B_KEEP_LOADED,
                &std_ops
        },

        NULL,
        exit_debugger,
        NULL,
        NULL
};

module_info *modules[] = {
        (module_info *)&sModuleInfo,
        NULL
};