[SOLVED] CS代考计算机代写 /* Creates N threads, each of which sleeps a different, fixed

/* Creates N threads, each of which sleeps a different, fixed
duration, M times.Records the wake-up order and verifies
that it is valid. */

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

static void test_sleep (int thread_cnt, int iterations);

void
test_alarm_simultaneous (void)
{
test_sleep (3, 5);
}

/* Information about the test. */
struct sleep_test
{
int64_t start;/* Current time at start of test. */
int iterations; /* Number of iterations per thread. */
int *output_pos;/* Current position in output buffer. */
};

static void sleeper (void *);

/* Runs THREAD_CNT threads thread sleep ITERATIONS times each. */
static void
test_sleep (int thread_cnt, int iterations)
{
struct sleep_test test;
int *output;
int i;

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

msg (“Creating %d threads to sleep %d times each.”, thread_cnt, iterations);
msg (“Each thread sleeps 10 ticks each time.”);
msg (“Within an iteration, all threads should wake up on the same tick.”);

/* Allocate memory. */
output = malloc (sizeof *output * iterations * thread_cnt * 2);
if (output == NULL)
PANIC (“couldn’t allocate memory for test”);

/* Initialize test. */
test.start = timer_ticks () + 100;
test.iterations = iterations;
test.output_pos = output;

/* Start threads. */
ASSERT (output != NULL);
for (i = 0; i < thread_cnt; i++){char name[16];snprintf (name, sizeof name, “thread %d”, i);thread_create (name, PRI_DEFAULT, sleeper, &test);}/* Wait long enough for all the threads to finish. */timer_sleep (100 + iterations * 10 + 100);/* Print completion order. */msg (“iteration 0, thread 0: woke up after %d ticks”, output[0]);for (i = 1; i < test.output_pos – output; i++) msg (“iteration %d, thread %d: woke up %d ticks later”, i / thread_cnt, i % thread_cnt, output[i] – output[i – 1]);free (output);}/* Sleeper thread. */static voidsleeper (void *test_) {struct sleep_test *test = test_;int i;/* Make sure we’re at the beginning of a timer tick. */timer_sleep (1);for (i = 1; i <= test->iterations; i++)
{
int64_t sleep_until = test->start + i * 10;
timer_sleep (sleep_until – timer_ticks ());
*test->output_pos++ = timer_ticks () – test->start;
thread_yield ();
}
}