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/** pthread_spinloc_t test. */
/* Make sure pthread_spinlock_t is available when compiling with older glibc
* versions (2.3 or before).
*/
#define _GNU_SOURCE
#include <pthread.h>
#include <stdio.h> /* fprintf() */
#include <stdlib.h> /* atoi() */
static pthread_barrier_t s_barrier;
static pthread_spinlock_t s_spinlock;
static int s_iterations;
static int s_counter;
static void* thread_func(void* arg)
{
int i;
pthread_barrier_wait(&s_barrier);
for (i = s_iterations; i > 0; i--)
{
pthread_spin_lock(&s_spinlock);
s_counter++;
pthread_spin_unlock(&s_spinlock);
}
return 0;
}
int main(int argc, char** argv)
{
int i;
const int n_threads = 10;
pthread_t tid[n_threads];
s_iterations = argc > 1 ? atoi(argv[1]) : 1000;
fprintf(stderr, "Start of test.\n");
pthread_barrier_init(&s_barrier, 0, n_threads);
pthread_spin_init(&s_spinlock, 0);
for (i = 0; i < n_threads; i++)
pthread_create(&tid[i], 0, thread_func, 0);
for (i = 0; i < n_threads; i++)
pthread_join(tid[i], 0);
pthread_spin_destroy(&s_spinlock);
pthread_barrier_destroy(&s_barrier);
if (s_counter == n_threads * s_iterations)
fprintf(stderr, "Test successful.\n");
else
fprintf(stderr, "Test failed: counter = %d, should be %d\n",
s_counter, n_threads * s_iterations);
return 0;
}
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