Pintos: pintos/src/tests/threads/priority-preempt.c Source File

00001 /* Ensures that a high-priority thread really preempts.
00002 
00003    Based on a test originally submitted for Stanford's CS 140 in
00004    winter 1999 by by Matt Franklin
00005    <startled@leland.stanford.edu>, Greg Hutchins
00006    <gmh@leland.stanford.edu>, Yu Ping Hu <yph@cs.stanford.edu>.
00007    Modified by arens. */
00008 
00009 #include <stdio.h>
00010 #include "tests/threads/tests.h"
00011 #include "threads/init.h"
00012 #include "threads/synch.h"
00013 #include "threads/thread.h"
00014 
00015 static thread_func simple_thread_func;
00016 
00017 void
00018 test_priority_preempt (void) 
00019 {
00020   /* This test does not work with the MLFQS. */
00021   ASSERT (!thread_mlfqs);
00022 
00023   /* Make sure our priority is the default. */
00024   ASSERT (thread_get_priority () == PRI_DEFAULT);
00025 
00026   thread_create ("high-priority", PRI_DEFAULT + 1, simple_thread_func, NULL);
00027   msg ("The high-priority thread should have already completed.");
00028 }
00029 
00030 static void 
00031 simple_thread_func (void *aux UNUSED) 
00032 {
00033   int i;
00034   
00035   for (i = 0; i < 5; i++) 
00036     {
00037       msg ("Thread %s iteration %d", thread_name (), i);
00038       thread_yield ();
00039     }
00040   msg ("Thread %s done!", thread_name ());
00041 }