/**
*
* Terminate the current process (maybe). If the current process has
* more than one running thread, only terminate the current thread.
* The process is only completely terminated (as per process_join
* wakeup and page table deallocation) when the final thread calls
* process_finish().
*
* @param The return value of the process. This is only used when the
* final thread exits.
*
*/
void process_finish(int retval)
{
interrupt_status_t intr_status;
thread_table_t *thread = thread_get_current_thread_entry();
process_id_t pid = thread->process_id;
if (retval < 0) {
/* Not permitted! */
retval = 0;
}
intr_status = _interrupt_disable();
spinlock_acquire(&process_table_slock);
/* Mark the stack as free so new threads can reuse it. */
process_free_stack(thread);
if (--process_table[pid].threads == 0) {
/* We are the last thread - kill process! */
vm_destroy_pagetable(thread->pagetable);
finish_given_process(pid, retval);
}
thread->pagetable = NULL;
spinlock_release(&process_table_slock);
_interrupt_set_state(intr_status);
thread_finish();
}
/**
* Terminates the current process and sets a return value
*/
void process_finish(uint32_t retval) {
interrupt_status_t intr_status;
process_id_t pid;
thread_table_t *my_thread;
// Find out who we are.
pid = process_get_current_process();
my_thread = thread_get_current_thread_entry();
// Ensure that we're the only ones touching the process table.
intr_status = _interrupt_disable();
spinlock_acquire(&process_table_slock);
// Mark the stack as free so new threads can reuse it.
process_free_stack(my_thread);
if(--process_table[pid].threads == 0) {
// Last thread in process; now we die.
// Mark ourself as dying.
process_table[pid].retval = retval;
process_table[pid].state = PROCESS_DYING;
vm_destroy_pagetable(my_thread->pagetable);
// Wake whomever may be sleeping for the process
sleepq_wake(&process_table[pid]);
}
// Free our locks.
spinlock_release(&process_table_slock);
_interrupt_set_state(intr_status);
my_thread->pagetable = NULL;
// Kill the thread.
thread_finish();
}
