42 lines
1 KiB
C
42 lines
1 KiB
C
|
/* Ensures that a high-priority thread really preempts.
|
||
|
|
|
||
|
|
Based on a test originally submitted for Stanford's CS 140 in
|
||
|
|
winter 1999 by by Matt Franklin
|
||
|
|
<startled@leland.stanford.edu>, Greg Hutchins
|
||
|
|
<gmh@leland.stanford.edu>, Yu Ping Hu <yph@cs.stanford.edu>.
|
||
|
|
Modified by arens. */
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include "tests/threads/tests.h"
|
||
|
|
#include "threads/init.h"
|
||
|
|
#include "threads/synch.h"
|
||
|
|
#include "threads/thread.h"
|
||
|
|
|
||
|
|
static thread_func simple_thread_func;
|
||
|
|
|
||
|
|
void
|
||
|
|
test_priority_preempt (void)
|
||
|
|
{
|
||
|
|
/* This test does not work with the MLFQS. */
|
||
|
|
ASSERT (!thread_mlfqs);
|
||
|
|
|
||
|
|
/* Make sure our priority is the default. */
|
||
|
|
ASSERT (thread_get_priority () == PRI_DEFAULT);
|
||
|
|
|
||
|
|
thread_create ("high-priority", PRI_DEFAULT + 1, simple_thread_func, NULL);
|
||
|
|
msg ("The high-priority thread should have already completed.");
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
simple_thread_func (void *aux UNUSED)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
for (i = 0; i < 5; i++)
|
||
|
|
{
|
||
|
|
msg ("Thread %s iteration %d", thread_name (), i);
|
||
|
|
thread_yield ();
|
||
|
|
}
|
||
|
|
msg ("Thread %s done!", thread_name ());
|
||
|
|
}
|