CS代考计算机代写 /* Tests that cond_signal() wakes up the highest-priority thread

/* Tests that cond_signal() wakes up the highest-priority thread
waiting in cond_wait(). */

#include
#include “tests/threads/tests.h”
#include “threads/init.h”
#include “threads/malloc.h”
#include “threads/condvar.h”
#include “threads/lock.h”
#include “threads/thread.h”
#include “devices/timer.h”

static thread_func priority_condvar_thread;
static struct lock lock;
static struct condvar condvar;

void
test_priority_condvar(void)
{
int i;

/* This test does not work with the MLFQS. */
ASSERT(!thread_mlfqs);

lock_init(&lock);
condvar_init(&condvar);

thread_set_priority(PRI_MIN);
for (i = 0; i < 10; i++) { int priority = PRI_DEFAULT - (i + 7) % 10 - 1; char name[16]; snprintf(name, sizeof name, "priority %d", priority); thread_create(name, priority, priority_condvar_thread, NULL); } for (i = 0; i < 10; i++) { lock_acquire(&lock); msg("Signaling..."); condvar_signal(&condvar, &lock); lock_release(&lock); } } static void priority_condvar_thread(void *aux UNUSED) { msg("Thread %s starting.", thread_name()); lock_acquire(&lock); condvar_wait(&condvar, &lock); msg("Thread %s woke up.", thread_name()); lock_release(&lock); }

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