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#include <pthread.h>
#include <stdio.h>
#include <unistd.h>
static int count = 0;
static void *
thread_add_one (void *arg)
{
int tmp;
pthread_spinlock_t *lock = (pthread_spinlock_t *) arg;
/* When do_test holds the lock for 1 sec, the two thread will be
in contention for the lock. */
if (pthread_spin_lock (lock) != 0)
{
puts ("thread_add_one(): spin_lock failed");
pthread_exit ((void *) 1l);
}
/* sleep 1s before modifying count */
tmp = count;
sleep (1);
count = tmp + 1;
if (pthread_spin_unlock (lock) != 0)
{
puts ("thread_add_one(): spin_unlock failed");
pthread_exit ((void *) 1l);
}
return NULL;
}
static int
do_test (void)
{
pthread_t thr1, thr2;
pthread_spinlock_t lock;
int tmp;
if (pthread_spin_init (&lock, PTHREAD_PROCESS_PRIVATE) != 0)
{
puts ("spin_init failed");
return 1;
}
if (pthread_spin_lock (&lock) != 0)
{
puts ("1st spin_lock failed");
return 1;
}
if (pthread_create (&thr1, NULL, thread_add_one, (void *) &lock) != 0)
{
puts ("1st pthread_create failed");
return 1;
}
if (pthread_create (&thr2, NULL, thread_add_one, (void *) &lock) != 0)
{
puts ("2nd pthread_create failed");
return 1;
}
/* sleep 1s before modifying count */
tmp = count;
sleep (1);
count = tmp + 1;
if (pthread_spin_unlock (&lock) != 0)
{
puts ("1st spin_unlock failed");
return 1;
}
void *status;
if (pthread_join (thr1, &status) != 0)
{
puts ("1st pthread_join failed");
return 1;
}
if (status != NULL)
{
puts ("failure in the 1st thread");
return 1;
}
if (pthread_join (thr2, &status) != 0)
{
puts ("2nd pthread_join failed");
return 1;
}
if (status != NULL)
{
puts ("failure in the 2nd thread");
return 1;
}
if (count != 3)
{
printf ("count is %d, should be 3\n", count);
return 1;
}
return 0;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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