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