1 /** pthread_spinloc_t test. */ 2 3 4 /* Make sure pthread_spinlock_t is available when compiling with older glibc 5 * versions (2.3 or before). 6 */ 7 #define _GNU_SOURCE 8 9 #include <pthread.h> 10 #include <stdio.h> /* fprintf() */ 11 #include <stdlib.h> /* atoi() */ 12 13 14 static pthread_barrier_t s_barrier; 15 static pthread_spinlock_t s_spinlock; 16 static int s_iterations; 17 static int s_counter; 18 19 20 static void* thread_func(void* arg) 21 { 22 int i; 23 24 pthread_barrier_wait(&s_barrier); 25 for (i = s_iterations; i > 0; i--) 26 { 27 pthread_spin_lock(&s_spinlock); 28 s_counter++; 29 pthread_spin_unlock(&s_spinlock); 30 } 31 return 0; 32 } 33 34 int main(int argc, char** argv) 35 { 36 int i; 37 const int n_threads = 10; 38 pthread_t tid[n_threads]; 39 40 s_iterations = argc > 1 ? atoi(argv[1]) : 1000; 41 42 fprintf(stderr, "Start of test.\n"); 43 pthread_barrier_init(&s_barrier, 0, n_threads); 44 pthread_spin_init(&s_spinlock, 0); 45 for (i = 0; i < n_threads; i++) 46 pthread_create(&tid[i], 0, thread_func, 0); 47 for (i = 0; i < n_threads; i++) 48 pthread_join(tid[i], 0); 49 pthread_spin_destroy(&s_spinlock); 50 pthread_barrier_destroy(&s_barrier); 51 if (s_counter == n_threads * s_iterations) 52 fprintf(stderr, "Test successful.\n"); 53 else 54 fprintf(stderr, "Test failed: counter = %d, should be %d\n", 55 s_counter, n_threads * s_iterations); 56 return 0; 57 } 58
