85 lines
1.8 KiB
C
85 lines
1.8 KiB
C
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <assert.h>
|
|
#include <sys/time.h>
|
|
#include "thread.h"
|
|
|
|
/* test pour verifier que prendre un mutex ne desactive pas l'equité envers les autres threads.
|
|
*
|
|
* valgrind doit etre content.
|
|
* Le programme doit finir.
|
|
*
|
|
* support nécessaire:
|
|
* - thread_create()
|
|
* - retour sans thread_exit()
|
|
* - thread_join() sans récupération de la valeur de retour
|
|
* - thread_mutex_init()
|
|
* - thread_mutex_destroy()
|
|
* - thread_mutex_lock()
|
|
* - thread_mutex_unlock()
|
|
*/
|
|
|
|
int fini = 0;
|
|
thread_mutex_t lock;
|
|
|
|
static void * thfunc(void *dummy __attribute__((unused)))
|
|
{
|
|
unsigned i;
|
|
|
|
/* on incremente progressivement fini jusque 5 pour debloquer le main */
|
|
for(i=0; i<5; i++) {
|
|
thread_yield();
|
|
fini++;
|
|
}
|
|
|
|
/* on attend que main remette à 0 */
|
|
thread_mutex_lock(&lock);
|
|
while (fini != 0)
|
|
thread_yield();
|
|
thread_mutex_unlock(&lock);
|
|
|
|
thread_exit(NULL);
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
thread_t th;
|
|
int err, i;
|
|
struct timeval tv1, tv2;
|
|
unsigned long us;
|
|
|
|
gettimeofday(&tv1, NULL);
|
|
|
|
/* on cree le mutex et le thread */
|
|
if (thread_mutex_init(&lock) != 0) {
|
|
fprintf(stderr, "thread_mutex_init failed\n");
|
|
return -1;
|
|
}
|
|
err = thread_create(&th, thfunc, NULL);
|
|
assert(!err);
|
|
|
|
/* on prend le lock puis on attend que l'autre mette fini = 5 */
|
|
thread_mutex_lock(&lock);
|
|
while (fini != 5)
|
|
thread_yield();
|
|
thread_mutex_unlock(&lock);
|
|
|
|
/* on baisse progressivement jusque 0 */
|
|
for(i=0; i<5; i++) {
|
|
thread_yield();
|
|
fini--;
|
|
}
|
|
|
|
/* fini */
|
|
err = thread_join(th, NULL);
|
|
assert(!err);
|
|
gettimeofday(&tv2, NULL);
|
|
thread_mutex_destroy(&lock);
|
|
|
|
us = (tv2.tv_sec-tv1.tv_sec)*1000000+(tv2.tv_usec-tv1.tv_usec);
|
|
printf("%lu us\n", us);
|
|
return EXIT_SUCCESS;
|
|
}
|