65 lines
1.9 KiB
C
Executable file
65 lines
1.9 KiB
C
Executable file
/* The main thread acquires a lock. Then it creates two
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higher-priority threads that block acquiring the lock, causing
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them to donate their priorities to the main thread. When the
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main thread releases the lock, the other threads should
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acquire it in priority order.
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Based on a test originally submitted for Stanford's CS 140 in
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winter 1999 by Matt Franklin <startled@leland.stanford.edu>,
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Greg Hutchins <gmh@leland.stanford.edu>, Yu Ping Hu
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<yph@cs.stanford.edu>. Modified by arens. */
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#include <stdio.h>
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#include "tests/threads/tests.h"
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#include "threads/init.h"
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#include "threads/synch.h"
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#include "threads/thread.h"
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static thread_func acquire1_thread_func;
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static thread_func acquire2_thread_func;
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void
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test_priority_donate_one (void)
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{
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struct lock lock;
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/* This test does not work with the MLFQS. */
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ASSERT (!thread_mlfqs);
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/* Make sure our priority is the default. */
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ASSERT (thread_get_priority () == PRI_DEFAULT);
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lock_init (&lock);
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lock_acquire (&lock);
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thread_create ("acquire1", PRI_DEFAULT + 1, acquire1_thread_func, &lock);
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msg ("This thread should have priority %d. Actual priority: %d.",
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PRI_DEFAULT + 1, thread_get_priority ());
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thread_create ("acquire2", PRI_DEFAULT + 2, acquire2_thread_func, &lock);
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msg ("This thread should have priority %d. Actual priority: %d.",
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PRI_DEFAULT + 2, thread_get_priority ());
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lock_release (&lock);
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msg ("acquire2, acquire1 must already have finished, in that order.");
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msg ("This should be the last line before finishing this test.");
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}
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static void
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acquire1_thread_func (void *lock_)
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{
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struct lock *lock = lock_;
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lock_acquire (lock);
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msg ("acquire1: got the lock");
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lock_release (lock);
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msg ("acquire1: done");
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}
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static void
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acquire2_thread_func (void *lock_)
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{
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struct lock *lock = lock_;
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lock_acquire (lock);
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msg ("acquire2: got the lock");
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lock_release (lock);
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msg ("acquire2: done");
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}
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