32 lines
838 B
C
32 lines
838 B
C
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/* Verifies that lowering a thread's priority so that it is no
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longer the highest-priority thread in the system causes it to
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yield immediately. */
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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/thread.h"
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static thread_func changing_thread;
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void
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test_priority_change (void)
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{
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/* This test does not work with the MLFQS. */
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ASSERT (!thread_mlfqs);
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msg ("Creating a high-priority thread 2.");
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thread_create ("thread 2", PRI_DEFAULT + 1, changing_thread, NULL);
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msg ("Thread 2 should have just lowered its priority.");
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thread_set_priority (PRI_DEFAULT - 2);
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msg ("Thread 2 should have just exited.");
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}
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static void
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changing_thread (void *aux UNUSED)
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{
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msg ("Thread 2 now lowering priority.");
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thread_set_priority (PRI_DEFAULT - 1);
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msg ("Thread 2 exiting.");
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}
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