Subversion Repositories HelenOS

/** Upon being scheduled to run, check if the current thread should stop.

 *

 * This function is called from clock(). Preemption is enabled.

 * interrupts are disabled, but since this is called after

 * being scheduled-in, we can enable them, if we're careful enough

 * not to allow arbitrary recursion.

 */

void udebug_before_thread_runs(void)

{

    ipl_t ipl;

    /* This will happen if we get preempted inside this function. */

    if (THREAD->debug_in_before_thread_runs)

        return;

    THREAD->debug_in_before_thread_runs = true;

    ipl = interrupts_enable();

    /* Now we're free to do whatever we need (lock mutexes, etc.) */

    /* Check if we're supposed to stop */

    udebug_stoppable_begin();

    udebug_stoppable_end();

    interrupts_restore(ipl);

    THREAD->debug_in_before_thread_runs = false;

}