54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
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/* Tests that cond_signal() wakes up the highest-priority thread
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waiting in cond_wait(). */
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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/malloc.h"
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#include "threads/synch.h"
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#include "threads/thread.h"
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#include "devices/timer.h"
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static thread_func priority_condvar_thread;
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static struct lock lock;
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static struct condition condition;
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void
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test_priority_condvar (void)
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{
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int i;
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/* This test does not work with the MLFQS. */
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ASSERT (!thread_mlfqs);
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lock_init (&lock);
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cond_init (&condition);
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thread_set_priority (PRI_MIN);
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for (i = 0; i < 10; i++)
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{
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int priority = PRI_DEFAULT - (i + 7) % 10 - 1;
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char name[16];
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snprintf (name, sizeof name, "priority %d", priority);
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thread_create (name, priority, priority_condvar_thread, NULL);
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}
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for (i = 0; i < 10; i++)
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{
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lock_acquire (&lock);
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msg ("Signaling...");
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cond_signal (&condition, &lock);
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lock_release (&lock);
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}
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}
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static void
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priority_condvar_thread (void *aux UNUSED)
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{
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msg ("Thread %s starting.", thread_name ());
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lock_acquire (&lock);
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cond_wait (&condition, &lock);
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msg ("Thread %s woke up.", thread_name ());
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lock_release (&lock);
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}
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